Re: [Qgis-user] Convert .shp to CAD, with attribute values as different layers

[Christine via QGIS-User]

 
 

Gesendet: Dienstag, 13. Februar 2024 um 11:20 Uhr
Von: geo.gu...@web.de
An: c...@urban-archaeology.co.uk
Betreff: Aw: [Qgis-user] Convert .shp to CAD, with attribute values as different layers



Dear Chiz,

you may achieve separated shapefiles with vector [menu] > Data Management Tools > Split Vector Layers [Tool]. 

 

The tool allows you to choose the attribute field as a unique ID field, the output field type (shp, dxf ...) and the output directory for the results of the tool. You may find the same tool in the Geoprocessing menu as well. 


 

Warm regards,

Christine

 

Gesendet: Dienstag, 13. Februar 2024 um 11:04 Uhr
Von: "Chiz Harward via QGIS-User" 
An: "qgis-user@lists.osgeo.org" 
Betreff: [Qgis-user] Convert .shp to CAD, with attribute values as different layers




Hallo, I have a shapefile that has attributes and need to convert this to a CAD file. I can do this by export project to dxf, but it comes through with one CAD layer per shapefile. I need to have the shapefile come through as different CAD layers according to one of the attribute fields.

 

Example: Shapefile contains many polygons, the attribute field ‘colour’ of each polygon can be red, blue, green etc. I need it to get it into CAD with a layer for the red polygons, one for the blue, one for green etc

 

Running QGIS 3.16.11 Hannover

Any help appreciated

 

Chiz Harward BA MCIfA he/him

Senior Archaeologist, Urban Archaeology

 

I work flexibly - so whilst it suits me to email now, I do not expect a response or action outside of your own working hours


http://urban-archaeology.blogspot.com

https://www.facebook.com/urb.arch/

http://gloscross-slabs.blogspot.co.uk/


Urban Archaeology

2 Slad View, 

Gaineys Well, 

Stroud,
Gloucestershire
GL5 1LQ

07881 486837
c...@urban-archaeology.co.uk

Urban Archaeology is a trading name of Chiz Harward BA MCIfA

 

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Re: [Qgis-user] Issues by using a script inside the python console

[Hesels, Marie-Christine via Qgis-user]

Hi Richard,


thanks for your hint! By adding the QgsProcessingFeatureSourceDefinition, it 
works :)


Regards,

Marie


Von: Richard Duivenvoorde 
Gesendet: Dienstag, 13. September 2022 20:46:59
An: Hesels, Marie-Christine; qgis-user@lists.osgeo.org
Betreff: Re: [Qgis-user] Issues by using a script inside the python console

I use succesfully the following in a script and a plugin:

 # Voronoing ONLY the selected
 # NOTE: the colon (:) behind 'memory' in the 'OUTPUT' param is 
mandatory,
 # else QGIS will create a geopackage!
 selected = True
 params = {
 'INPUT': QgsProcessingFeatureSourceDefinition(point_layer.id(), 
selectedFeaturesOnly=selected),
 'OUTPUT': 'memory:',
 'BUFFER': 5,
 }
 result = processing.run("qgis:voronoipolygons", params)

Maybe you can use that to reconstruct your call?

Regards,

Richard Duivenvoorde


On 9/13/22 10:52, Hesels, Marie-Christine via Qgis-user wrote:
> Hi all,
>
>
> I am currently using the "Snap to Roads" script inside my qgis environment, 
> to match gpx-points to the OSM 
> (https://spatialthoughts.com/2020/02/22/snap-to-roads-qgis-and-osrm/ 
> <https://spatialthoughts.com/2020/02/22/snap-to-roads-qgis-and-osrm/>).
>
> I am able to execute the Script by using the QGIS Script Environment:
>
>
>
> Unfortunatly, I would like to run the script via python console inside QGiS, 
> but this doesn't work at all ...
>
>
> By executing the following command:
>
>
> layer_SnappedLine = processing.run("script:snap_to_roads",
> {'INPUT':layer_GPX_Points['OUTPUT'],
> 'SERVICE':'http://127.0.0.1:5000',
> 'TOLERANCE':10,
> 'OUTPUT':'TEMPORARY_OUTPUT'})
>
> I receive the error message:
>
> "Traceback (most recent call last):
>
>File "C:\PROGRA~1\QGIS32~1.10\apps\Python39\lib\code.py", line 90, in 
> runcode
>  exec(code, self.locals)
>File "", line 1, in 
>File 
> "C:\PROGRA~1/QGIS32~1.10/apps/qgis-ltr/./python/plugins\processing\tools\general.py",
>  line 108, in run
>  return Processing.runAlgorithm(algOrName, parameters, onFinish, 
> feedback, context)
>File 
> "C:\PROGRA~1/QGIS32~1.10/apps/qgis-ltr/./python/plugins\processing\core\Processing.py",
>  line 205, in runAlgorithm
>  layer = context.takeResultLayer(result)  # transfer layer ownership out 
> of context
> TypeError: QgsProcessingContext.takeResultLayer(): argument 1 has unexpected 
> type 'QgsFeatureSink'"
>
> Can anybody help me with this issue? I am using QGIS Version 3.22.10
>
> Regards and thanks,
> Marie
>
>
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[Qgis-user] Issues by using a script inside the python console

[Hesels, Marie-Christine via Qgis-user]

Hi all,


I am currently using the "Snap to Roads" script inside my qgis environment, to 
match gpx-points to the OSM 
(https://spatialthoughts.com/2020/02/22/snap-to-roads-qgis-and-osrm/).



I am able to execute the Script by using the QGIS Script Environment:

[cid:317d9d57-3f6d-41dd-8234-b68dcfa66fc2]


Unfortunatly, I would like to run the script via python console inside QGiS, 
but this doesn't work at all ...


By executing the following command:


layer_SnappedLine = processing.run("script:snap_to_roads",
{'INPUT':layer_GPX_Points['OUTPUT'],
'SERVICE':'http://127.0.0.1:5000',
'TOLERANCE':10,
'OUTPUT':'TEMPORARY_OUTPUT'})


I receive the error message:

"Traceback (most recent call last):

  File "C:\PROGRA~1\QGIS32~1.10\apps\Python39\lib\code.py", line 90, in runcode
exec(code, self.locals)
  File "", line 1, in 
  File 
"C:\PROGRA~1/QGIS32~1.10/apps/qgis-ltr/./python/plugins\processing\tools\general.py",
 line 108, in run
return Processing.runAlgorithm(algOrName, parameters, onFinish, feedback, 
context)
  File 
"C:\PROGRA~1/QGIS32~1.10/apps/qgis-ltr/./python/plugins\processing\core\Processing.py",
 line 205, in runAlgorithm
layer = context.takeResultLayer(result)  # transfer layer ownership out of 
context
TypeError: QgsProcessingContext.takeResultLayer(): argument 1 has unexpected 
type 'QgsFeatureSink'"

Can anybody help me with this issue? I am using QGIS Version 3.22.10

Regards and thanks,
Marie
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Re: [Qgis-user] Display of the 3D View Window

[Christine via Qgis-user]

Tried it with a updated QGIS version (3.26.0) and the problem seems to be solved.

Regards, Christine
 

Gesendet: Montag, 11. Juli 2022 um 17:54 Uhr
Von: geo.gu...@web.de
An: "QGIS User Mailing List" 
Betreff: Display of the 3D View Window



Dear QGIS user collegues,

 

I am not able to get QGIS 4.24 to display a 3D View window again once it has been closed. Remember I had such a problem also in a earlier version.

 

When I create a new 3D view, configure all necessary, the 3D vie is dsiplayed, I can navigate and so on. When I close it somehow or the 3D view window gets hidden behind something else, then it seems to be lost. In the menu 'View' there are two possibilities to make it display again, but either it doesn't work or QGIS crashes ...

 

Is this a known bug or is there a trick to get the somehow hidden window display again ?

 

Thanks for hints,

regards, Christine





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[Qgis-user] Display of the 3D View Window

[Christine via Qgis-user]

Dear QGIS user collegues,

 

I am not able to get QGIS 4.24 to display a 3D View window again once it has been closed. Remember I had such a problem also in a earlier version.

 

When I create a new 3D view, configure all necessary, the 3D vie is dsiplayed, I can navigate and so on. When I close it somehow or the 3D view window gets hidden behind something else, then it seems to be lost. In the menu 'View' there are two possibilities to make it display again, but either it doesn't work or QGIS crashes ...

 

Is this a known bug or is there a trick to get the somehow hidden window display again ?

 

Thanks for hints,

regards, Christine
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Re: [Qgis-user] polygon fills from different shapefiles

[Christine via Qgis-user]

Context menu of your shapefile > properties > choose Tab "Symbology" > select "Categorize" in the first line with the attribute for the name of the geologic formation as the value in the second line. Click on "Classify" and style your polygons as appropriate.

 

Regards, Christine

 
 

Gesendet: Dienstag, 21. Juni 2022 um 05:19 Uhr
Von: "Firstname Lastname via Qgis-user" 
An: Qgis-user@lists.osgeo.org
Betreff: [Qgis-user] polygon fills from different shapefiles


i have four different geologic maps that i have imported as shapefiles.  The files have filled polygons that have the name of the geologic formation in the attribute tables.  i would like to have a common colour for each polygon of identical age/name for all the map sheets.  Each map sheet has a similar list of formations, but some of the formations are different for each map sheet. 
What is the most efficient way to make the identically named polygons displayed with the same colour?  Should i add a column in each attribute table and put a formation code in for each one manually or can i add an RGB colour for each formation in the attribute table? or, do i need to categorize and  classify these in the layer properties table after i have added formation code in the attribute table?

i hope that my question is clear.

 
--


Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited

Calgary, Alberta Canada

by...@conjugategeo.com

Cell:4037108414





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Re: [Qgis-user] Country coastal borders

[Christine]

Hi Pat and others,

checked in an old textbook of my years of study: 
The *Mean High Water* (MHW) line forms the actual beach line or bank line. 

/[source: Wilhelmy, H. (1981): Geomorphologie in Stichworten. III Exogene
Morphodynamik. Kiel, Germany. p. 103]/

regards, Christine


chris hermansen wrote
> On Wed, May 5, 2021 at 8:10 AM Pat Brown 

> mistyhaven@

>  wrote:
> 
>> Hi
>> What constitutes a coastline? Is it the high water mark, the low
>> water
>> mark, something intermediate, the claimed territorial waters or something
>> else? I would also guess that this would differ depending on whether
>> political or geographical.





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Re: [Qgis-user] Georeferencing old aerial photos

[Christine]

Received a feedback from Alex directly and off the list, which I add here for
completing the topic at this point. Please keep the logic of the
topics/threads to avoid confusion. 


Alex wrote
> Please see
> https://docs.qgis.org/3.16/en/docs/training_manual/forestry/map_georeferencing.html?highlight=georeferencing
> 
>  Alex 





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[Qgis-user] Folder .qgis2 - not used any more by QGIS 3 ?

[Christine]

Dear QGIS community,

recently I was surprised in QGIS 3.16 and QGIS 3.18 by missing some menu
items. Solved this. 

But while searching for the reason and a solution of the QGIS GUI behaviour
I checked for the folder '.qgis2' as a matter of routine - and couldn't find
it any more on my system. Compared this to other installations of QGIS 3.x
under Windows, where I still found this folder in the expected path, but
maybe these are leftovers from earlier versions. 

Does QGIS 3 doesn't use this folder any more for saving GUI settings under
Windows? 
Have found a file 'qgis.ini' in the path
'C:\Users\\AppData\Roaming\QGIS\QGIS3\profiles\default\QGIS', that I
suspect to have a similar function. 

Thanks for a feedback of someone who knows more to lighten this up !  
Regards, Christine



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[Qgis-user] Georeferencing old aerial photos

[Christine]

Dear Fred,
have transferred your question to a separate topic, because it would
probably get lost in the other topic where you posted your question. 

So, you maybe got quite far with the georeferencing process, but did not
complete it ?
Suppose, you have tried it with the Georeferencer in the Raster menu and
loaded a raster file. Then you assigned the referencing point by first
clicking on the aerial photo and then one from the map canvas as the
reference, then cklicked OK, repeatedly for serveral points distributed on
the aerial map, I guess. 

Did you make any transformation settings like transformation type,
resampling method, srs and perhaps an output file name ? You can check the
box in the last line of the settings dialog to let the referenced raster
load into your project when referencing process is done. You need to start
the georeferencing process with a cklick ohn the *green triangle button*
(start georeferencing) or with menu *File > Start Georeferencing*. 

Regards, Christine


Re: Editing attribute tanle
Apr 11, 2021; 8:58pm — by Fred Meek Fred Meek

Hi

I am a newbee to using qgis 3.16.4

I am trying to georeference old aerial photos on modern maps.  I am getting
the coordinates by clicking on a location on the aerial photo and then the
same location on a map brought in from the web.  The points generated appear
to be good.

The problem is when I go to the raster on my computer and add it to the map
it is not georeferenced. 

Can someone explain how to get the raster displayed on the map
georeferenced?

Thanks, Fred



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Re: [Qgis-user] raster layer combination

[Christine]

Dear Milena,

have a look at the tool  'Sample raster values' in QGIS Geoprocessing: This
algorithm creates a new vector layer with the same attributes of the input
layer and the raster values corresponding on the point location.

If you sample the values of your raster layers for your given points (large
airports or outbreak location points) you should get what you want. To
complete the parameters for your regression analysis you should probably
also perform a distance analysis, perhaps with the tool 'Distance to nearest
hub (points)', but I never used this tool. 

I would try the sampling of the rasters and a distance analysis focusing
both on the airports and the outbreak location points as well. I mean
approach the regression from both sides. 

Regards, Christine




Milena Muehler wrote
> ... I have several raster layers (population density; livestock density;
> mammal density; etc.) and two text layers (so I've imported two csv files
> with longitudes and latitudes into QGIS and now I have points about the
> location of large airports and location points where there was a zoonotic
> infectious disease outbreak). 
> 
> My intention is to „combine“ all layers and to get all the values under
> this specific point of an outbreak. So that I have the exact value of the
> population density, livestock density ans so on where the outbreak
> occurred. I guess I have to make the calculation within a certain vicinity
> though. 
> [...]
> In the end I want to have a file as an output with values to make
> regression analysis in SPSS. 





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Re: [Qgis-user] Create circle with diameter in QGIS

[Christine]

Dear Madeline,
you may start with a point layer : the point(s) as the mid point(s) of your
circle(s).
Then you can draw a buffer of a certain distance with the buffer tool
(geoprocessing tools) around your point(s). In case of a buffer for points
the distance is the same as the radius of the circle you are searching for. 

Attention: the segments parameter controls the number of line segments to
use in oder to approximate a circle when creating rounded offsets. More
segments mean a closer approximation. Be aware that a shapefile cannot save
a true circle by nature but only an approximation to a circle with straight
segments. 

With the multi-ring buffer tool you might create more than one buffer at a
time around your point(s), so you could get as many rings (circles) around
your point(s) as you like. Certainly you have to determine the distance
between the circles you want to get. The output of the buffer tools have
automatically a polygon geometry. 

Regards, Christine



Madeline Krohn wrote
> I would like to create a circle whose diameter is 75 metres. I am using
> QGIS version 3.16.3-Hannover.
> My procedure so far has been like this:1. create a new shapefile layer ->
> geometry type: polygon2. in edit mode of this layer: add circle with
> centre and another point--> How can I change the radius/diameter of the
> circle afterwards or is there another possibility to create a circle with
> diameter directly?





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Re: [Qgis-user] DEM Scale problem

[Christine]

Dear Aloisio,

if I understand you right, you have added a scale bar via menu "View" >
Decorations > Scale Bar ...
to your Map View and then your map view scale changed. Tried it with my
3.14.16 version of QGIS and the map scale doesn't change with switching on
or of the map view scale bar as a decoration object. If the map scale has
been unvoluntarily changed you should be able to adjust it again as you
like. 

Or did you add a scale bar to the Print Layout ? 
There it may happen, that the label unit multiplier as a property of the
scale bar is unvoluntarily set to something different than 1.00 and then
cause much irritation. Should be normally 1.0 and nothing else.

Regards, Christine




Aloisio Jose Bueno Cotta wrote
> I'm working With QGIS 3.16 and realized that my DEM in UTM Sirgas 2000 24S
> suffered a change after I added the scale bar (view/decoration). The
> distances in the DEM are now 1.000.000 times smaller. (The SRC  still the
> same).
> 
> Where it was supposed to show 1 km long, now is measuring 0.01 m.
> I did remove  the escape bar, but the problem remains!

the 



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Re: [Qgis-user] editing a layer in excel

[Christine]

dear Marin,

yes, this workflow should work. 

But you can also edit the attribute table directly in QGIS: 
select the layer to edit in the Layers Tree, right click and choose: "Toggle
Editing" (~ open editing)  and then with right click again: "Open Attribut
Table". The Attribute Table should be then displayed ready to edit, rather
similar like in Excel. 
Having completed editing, save the edits with the save button and then
"Toggle Editing"  to close  the editing session again. 

There is a toggling mechanism to prevent users from unvoluntary changes of
their layers.

Regards, Christine


Marin Mirosevic wrote
> If workflow could be confirmed that this is ok the way Columns can be
> updated/Joined?
> 
>   1.  Export as excel from a Layer (from Qgis)
>   2.  Edit Excel file (edists are backpropagated to Qgis table)
>   3.  Right click on Polygon/Point  (holding attributes) - Properties
> -Joins (select excel table which lies as table in Qgis )-select Join and
> Target field(which have to be the same)- select Joined fields(to bring in
> changed columns in Excel itself)
>   4.  Column(s) added
> 
> Also could Parameters/Columns - be just updated with new values (maybe
> better then join as new parameter/column)? IF yes how ( didn't found an
> option)





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Re: [Qgis-user] How to automatically rasterize all attribute table columns

[Christine]

dear Alejandro,
have done that recently with the Rasterize Tool (Vector to Raster) in the
batch modus without the graphical modeller. You find the button to switch to
the batch modus in the left down corner of the tool's dialog box.  
You just have to add a number of lines according the fields to rasterize and
set the parameters. The batch dialog helps you to select the fields and
parameters. 

The field name may be added automatically to the name of the output raster
with an expression according the pattern:  
substr(@INPUT, 1, 35)  || '_'  ||  @FIELD 
with a substring of the layer name (e.g. character 1 - 35) followed by the
field name. 

You may also save the settings to a file and reuse the settings again. 

regards, Christine


alechamizo wrote
> I have a vector layer with several fields from the attribute table and I
> would like to rasterize all of them automatically and have the output
> raster have the column name.
> Is it possible to do this in QGIS graphical modeler?





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Re: [Qgis-user] Label overlapping between layers

[Christine]

Good evening Pietro,
did you already consider to apply the functions of the label toolbar ?
With the tools of the label toolbar you may rearrange the automatic
positioning of the label (e.g. move, rotate). 

Regards, Christine



pieri70 wrote
> I would like that the label of the bottom one wil not overlap the top one
> geometry.
> Is there any way to achieve this?
> I played with label weight but I didn't get success





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Re: [Qgis-user] I cannot find the QGIS software on my laptop after trying to upgrade to the latest version - QGIS 3.14

[Christine]

Dear Jane,
how did you proceed with the installation ? It sounds as if you have
installed QGIS with the Standalone installer. Apparently you have been
installing on a Windows System. 

That the Short cut icons have vanished, wouldn't be a problem. 

Don't you have a bin folder in your installation path of QGIS like e.g.
'C:\Program Files\QGIS\bin' ? There should be a qgis-bin.exe like:
qgis-bin.exe, qgis-bin-g7.exe, qgis-ltr-bin.exe  or so. If you double click
on such an exe, a QGIS version should start.

Sorry, If I can't compare the path for the qgis-bin.exe directly with one of
my installations, because I install normally with OSGeo4W and then the
default path is different. 

Regards, Christine


Adim Ijeaku wrote
> I tried to upgrade my QGIS to the latest version (QGIS 3.14), after
> installation, I couldn't locate it on my laptop anymore. However, I can
> see
> it in the uninstall section of my laptop. I have tried uninstalling it and
> re-installing it back, yet, I am still faced with the same problem.
> 
> Following the file path I stored it during the installation, I found the
> QGIS 3.14 folder on my 'Program Files', but didn't find a shortcut icon. I
> saw and run the 'qgiscrashhandler.exe', but a System error pop-up tells me
> that 'Qt5Widgets.dll, Qt5Gui.dll, Qt5Core.dll were not found. Reinstalling
> the program may fix this problem.' I have reinstalled and redownloaded
> QGIS
> software countless times, yet the issue subsists. 





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Re: [Qgis-user] Taken photo windows tablet

[Christine]

Hi Guayente,

there is a QGIS plugin 'ImportPhotos' that works fine. 
If you put all your photos that should be enclosed in a layer for QGIS, in
one folder, the plugin will create a point layer with the recorded
coordinates according the geo taggings of the photos. The resulting layer
will be a styled GeoJSON Layer loaded in an open QGIS project. If you click
with the plugin's 'Click Photos' tool on a photo point, the corresponding
image is opened with the default image viewer of your system. 

This works with all geo tagged photos. 

Regards Christine



Guayente Corral wrote
> ... Is there a good way to capture images with the windows tablet camera
> in the field and link them to data ?
> ...





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Re: [Qgis-user] QGIS has the virus Hacktool.Win64.NirCMD.SM?

[Christine]

Good evening,
was also worried this afternoon by the same alerts on two different machines
of my employer. Both with TREND supervision. The alerts had something to do
with contents in  OSGeo4W and QGIS folders. Couldn't reach the IT colleques
so will possibly  have discussions tomorrow. 

Regards, Christine



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Re: [Qgis-user] inserting a new place or feature

[Christine]

Hi Hamish,
the simpliest way to find out the the coordinates of a position is to place
the cursor on the desired position and then read the coordinates in the line
below the map window (titled 'coordinate').

If you insert a new place with the insert function, you don't add it only to
the attribute table but to the underlying data layer. the coordinates are
added automatically and saved with the changes. You can also write them to
new attributes and make them visable in the attribute table.

Regards, Christine



Hamish Macdonald wrote
> ...  is there a simple way of finding out the coordinates to position the
> inserted name? ...





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Re: [Qgis-user] 2019 USGS 7.5min topo sheets

[Christine]

Dear Nicolas,
thank you for clearing. 
Then the download file itself is most pobably the reason for the problems.  

Reagards, Christine

_

Nicolas Cadieux:
... The PC desktop. If you download the last version of adobe reader, you
should be good. The download folder should be good. Having a PDF on the PC
desktop would send the PC cpu at 100% usage.



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Re: [Qgis-user] 2019 USGS 7.5min topo sheets

[Christine]

Dear Eric,
have checked: QGIS 3.4 seems to support GeoPDF (listed in the supported
files), but I didn't tested. From version 3.10 QGIS has the new feature of
writing capability for GeoPDF. 

Dear Nicolas,
with desktop do you mean the desktop section on a PC or a desktop PC as a
whole ? 
Had the download file saved in the standard download folder, not in the
desktop section. 

Regards, Christine 



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Re: [Qgis-user] 2019 USGS 7.5min topo sheets

[Christine]

Good evening MacKinnon's,
although being rather familiar with GIS, I don't Know yet GeoPDF. Tried to
load your USGS download file in QGIS 3.12.0 on Win 10. Had also trouble,
although I didn't got an error message. But the CPU of my system reached
it's limit for a felt eternity without coming further and I had to stop QGIS
rather violently. Seems to be something strange with the USGS GeoPDF.

Regards, Christine



MacKinnon's wrote
> ... I have been using USGS 7.5' topo map as base layers for a couple of
> years.  My latest download, of amap sheet created on 12-18-19 will not
> load.  Error message is "Invalid Data Source"  Also of note is that the
> new map is much larger than earlier versions. 40mg vs 15-20mg.  Is this an
> intentional change by USGS or an error formatting the file.
> 
> Map sheet in question is MI_Garden_20191218_TM_geo.pdf





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Re: [Qgis-user] Creating Rectangle Around Central Point

[Christine]

Dear Mike,

have you already tried the tool 'Rectangles, Ovals, Diamonds' of the Vector
geometry group in the QGIS Geoprocessing ?

The tool requires the input of points (you have one: your GPS coordinate).
You may choose 'rectangle' as the desired shape and the width and height of
the rectangle with 1 km. 

Should work. Problems may occur perhaps, if you are trying to apply the tool
with a non-projected coordinate system. GPS devices often return only
geographic coordinates. Maybe you should reproject your central point before
applying the tool and ensure you have set a projected coordinate system with
Meters as a measure unit in your QGIS project.  

Regards and good luck,
Christine



Michael Jabot wrote
> I am trying to create a square 1km X 1km around a central point that has
> GPS coordinates.
> 
> I have tried every suggestion and plugin suggested but am struggling.





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Re: [Qgis-user] Random Points Inside Polygon (variable)

[Christine]

Dear Adrian,

meant, the tool you are looking for, is still present under menu 'Vector' >
Research Tools in my QGIS installations up to version 3.12. So the tool
seems not to be dropped generally. 

The access via Geoprocessing Toolbox is an alternative. Or does is the tool
missing in the Geoprcessing toolbox ?

Regards, Christine



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Re: [Qgis-user] Random Points Inside Polygon (variable)

[Christine]

Dear Adrian,

in my QGIS 3.10.3-A Coruña as well as the QGIS 3.12 installation the tool
'Random Points inside Polygon' is still present. The same tool may be
accessed as well via menu 'Processing' > Toolbox (Geoprocessing Toolbox) >
Vector Creation > Random points inside polygon. Should be what you are
looking for. 

Regards, Christine



Adrian Ponsen wrote
> ... recent updated my QGIS to 3.10.4. But it seems like the newer version
> no longer has the "Random Points Inside Polygon (variable)" feature that
> used to be under vector/research tools. Is
> that true?
> ...
> Is it still possible to do this in QGIS 3.10.4? If so could someone
> explain
> how?





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Re: [Qgis-user] Split features

[Christine]

Christine wrote
> ... I cannot achieve a splitting of features with my specific
> lineZ feature dataset at all and I have no idea why. Couldn't find an
> entry
> of a known bug or problem for this,  ...

Have found a roundabout with the creation of an overlay layer (close buffer
polygons around the lines), some manual effort with splitting the buffer
polygon layer at the desired positions and then applying an intersection
(Union) of the line and the buffer polygons. 

After this processing I found another feature left to split and actually
succeeded to apply the split features tool on this feature while on others
the tool still refused to work.  

The split features tool seems to work basically but not always. So I suspect
the data are causing problems although the reason are probably not classical
geometry flaws (applied all available tools to fix that including AG
Toolbox). 

The dataset was converted in severals step from DWG of the CAD world to a
GIS format. Whatever this may have caused. 

Regards, Christine



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[Qgis-user] Split features

[Christine]

Dear colleagues,

since a while I am struggling with the 'split features' tool that doesn't
like to split my line features (lineZ). Have already checked for geometry
problems in my dataset (geopackage), the data are projected (dataset and
project CRS are the same). The split featurs  tool works fine with polygon
features but is reluctant with my lineZ features. Have tried this with
severall versions of QGIS 3.10 upwards on windows 10. 

The QGIS online help even suggests a split with snapping on a line vertex.
But my experience up to now is, that this works only sometimes. I succeded
to split a test line rather reliable with the snapping option off. 

Unfortunately I cannot achieve a splitting of features with my specific
lineZ feature dataset at all and I have no idea why. Couldn't find an entry
of a known bug or problem for this, so I turn to the mailing list for
consult now. 

Regards, Christine





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Re: [Qgis-user] Plugin Slicer

[Christine]

probably this one:   https://plugins.qgis.org/plugins/Slicer/

Regards, Christine


Tobias Wendorff wrote
> Can anyone please give a link to the plugin? Perhaps we can find an
> alternative.





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Re: [Qgis-user] Plugin Slicer

[Christine]

dear Everton,

checked the plugins in my *QGIS 3.10* installations and may confirm, that a
SLICER plugin is not available via the plugin manager.  Found also  
https://plugins.qgis.org/plugins/Slicer/
in the QGIS Plugin repository,
telling explicitly that the SLICER plugin was created for QGIS version 2. 

So it seems you have to *install a QGIS verson 2* if you want to use the
SLICER plugin. 
Principally it is possible to have several versions of QGIS installed on the
same machine. But I have actually experienced problems with the
geoprocessing of QGIS 2 after having installed also QGIS 3. May somebody
else give an advice for that ?  


Nicolas Cadieux wrote
> ... need to use the SLICER plugin but I did not find it in the version I
> installed (3.10.0) I found D.E.M. slicer that is very different!
> Is there a solution to download the original SLICER version 2.14 in Qgis
> 3.10?





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Re: [Qgis-user] pointinformatieon to isohypes

[Christine]

Dear Jean,

you need to interpolate your point information to a raster and then you may
extract isohypes based on the grid.

Regards, Christine



Weijers, Jean (Kerkrade) wrote
> Is there a tool in qgis to convert point information to isohypes?






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Re: [Qgis-user] Bringing georeferenced rasters into QGIS

[Christine]

QGIS understands *.jgw, *.tfw and *.wld. Never had a problem with that
before. 
As I remember, newer ArcGIS ignore these worldfiles, if an ESRI specific
file is present (.aux or so). So maybe the worldfiles are the problem - what
doesn't matter in ArcGIS, but in QGIS. 

Regards, Christine



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Re: [Qgis-user] Navigation in a map with Lon-Lat Coordinates

[Christine]

Wolfgang Reichart wrote
> ... now Im looking to find an Airport with the following Coordinates: 
> 
> 
>   50468N,
> 7948O 
> 
>

Dear Wolfgang,

not sure how to guide you with your coordinates (in DMS writing) to the
searched location in QGIS. But if you start *Google Earth* (standalone) and
having set the coordinate system under *Tools* > *Options* to "Grad,
Minuten, Sekunden" (= *D*egree *M*inutes *S*econds), you may set a new
position mark (point) wherever you like and enter your coordinates in the
appropriate fields. Better enter E for O. 

Have found your airport in Havelar just in a few seconds this way. You may
exchange positions between QGIS and Google Earth using kml format files. 

Perhaps it's possible to enter also DMS-coordinates in QGIS. But I would
rather calculate the appropriate DD (decimal degrees) coordinates and use
these. Would be in your case 50.768889 N, 7.16 E. If you enter a small
limited text file (table) in QGIS with 7.16 for X and 50.768889 N for Y
direction you may import this directly in QGIS. 

Regards, Christine



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Re: [Qgis-user] clip polygon with raster

[Christine]

Boaz Bar Ilan wrote
> im trying to do this  ( with clip from vector/ geoprocessing tool , and
> its
> failing again and again
> im using 2.18.24
> I get messege 'QgsRasterLayer' object has no attribute 'fields' See log
> for
> more details

Do you really try to clip a polygon with a raster or reverse ? Suppose,
clipping a polygon with a raster will not work. To clip a raster with a
polygon sounds more logical. If you want to get the boundary box of a raster
as a polygon you may use another tool: e.g. QGIS menu "Vector" > research
tools > Polygon from layer extent

Regards, Christine




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Re: [Qgis-user] Display Kanji from SHP files

[Christine]

Markus Hauser wrote
> I have a SHP file (from Geospatial Information Authority of Japan) with
> Kanji letters.
> How can I display those correct? Now I only get weird Latin letters.

You should choose an appropriate encoding for the shapefile in its
properties > source tab. Beeing not an expert in digital representation of
japanese font types, I would first try to use UTF versions and JIS7.
According Wikipedia JIS encoding refers to several Japanese Industrial
Standards for encoding the Japanese language. 

Regards, Christine




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Re: [Qgis-user] AREA ATTRIBUTE FOR VECTOR LAYER

[Christine]

Hi Ricardo,
if you want to get a density of school points in each polygon, you may
calculate this in the field calculator. 
Assure, you are working in a projected coordinate sytem. Open attribute
table and choose 'open field calculator'. With the field calculator dialog
open, give a name to a new attribute for school density, choose an
appropriate output field type (probably decimal number, real), output field
length and precision and use an expression pattern like 
   / $area 

You get the correct syntax of your   
doubleclicking on the field's name under 'fields and values'. Be aware that
$area will have the dimension of the squared coordinate reference system's
measure unit (feet or meters). If you want a density based e.g. on km you
have to devide your area accordingly. 

Regards, Christine






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Re: [Qgis-user] AREA ATTRIBUTE FOR VECTOR LAYER

[Christine]

Ricardo Thompson wrote
> I have a polygon vector layer and want to derive an area attribute to use
> to calculate the density of schools in each polygon. Can somebody help?

Hi Ricardo,
if you have a points layer (e.g. for school locations) and a polygon layer
you may count the number of points (schools) that are located in each
polygon with: 
Menu 'Vector' > analysis tools > Count points in polygon. Choosing this
opens a dialog where you can choose your input layers (polygon and points),
an attribute name for the points count and a name and path for the new file
that is created.

Regards, Christine




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Re: [Qgis-user] editing shapelayer doesnt work

[Christine]

info-2 wrote
> ... converted datas of format dwg ( autocad) to shape file, with program
> cad2shape 4.0 then i builded in qgis a shapelayer an added two more
> columns and filled up the features, all works fine. after all, i saved as
> qgis project.
> 
> after closing qgis and restarting the projectfile, i could no more change
> the editing status of the layer, to work with the features, the whole
> digitizing toolbar was inactive.
> ...

Have you saved your changes to your shapefile before toggling/leaving
editing mode? 
That's not the same as to save the QGIS project file (*.qgs), see  *
<http://docs.qgis.org/2.0/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html>
Editing* , particularly section "Digitizing an existing layer". 

Regards, Christine





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Re: [Qgis-user] script to simplify 'Set to Map Canvas Extent'

[Christine]

It's always a question of training and practice to take benefit from a tool
or software. There are differences in concept and solutions between ArcView
/ ArcGIS and QGIS. For me, QGIS is really great particularly due to the
integration of GRASS and SAGA e.g. But of course, it's necessary to dive
deeper into this all to take benefit from.
 
For people who can't dive deeper, it might be better to choose or create a
more simple viewer with limited functionality for a map output / print
output. And there your proposed button seems appropriate for me. It's really
difficult to have a program sophisticated and simple at the same time and in
the same instance. Should be possible to simplify the QGIS GUI (a QGISimple
fork ?) or this has been already achieved by somebody. Depends always on
demands and a volunteer to complete it. 

By the way: if somebody really misses the old ArcView (3), he could give
gvSIG a try. gvSIG is an open source project as well, programmed in Java and
rather similar to ArcView 3. Found it much easier and more comfortable to
create maps with QGIS, but that might be a question of tastes. 
 
Warm regards,
Christine



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Re: [Qgis-user] refresh zoom extent in composer

[Christine]

Willem Coetzer wrote
> If the zoom extent in the view changes, is there a way to update the
> composer to reflect the same extent or do you need to create a new
> composer?

Dear Willem,
you don't need to create a new composer. Procedure may depend on your QGIS
version, in elder versions the window to select an item may be missing. 

First select the map item in the composer view (right column). In the item
properties tab (below) scroll to the extents section. There you can find the
two buttons "set to map canvas extent" and "view extent in map canvas". 

Click the first one to transfer your map window extent coordinates (your
"view") to your composer map extents (your "composer"). That's what you
wanted to do as I understand it. 

With the second button you might do the reverse: transfer the composer map
extent coordinates (your "composer") to your map window (your "view"). 

Regards, Christine




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Re: [Qgis-user] inquiry

[Christine]

Siki Zoltan wrote
> you can share your shape files (.shp, .shx, .dbf) simply giving the files
> to your collegues. To share a QGIS project file with ArcGIS users is not
> available. I have heard about QGIS plug-in to read an ArcGIS mxd.
> http://gis.stackexchange.com/questions/23717/converting-arcgis-mxd-file-to-qgis-qgs-file

This question comes up from time to time. Many of us would appreciate if
they were able to exchange complete rendering/styling definitions with
ArcGIS users or applications. Have an eye on that, but all what I found up
to now did not work really. If somebody can disconfirm this: very welcome
!!! But as long as ESRI does not support such an approach, we shouldn't
exspect to get it. 

So, Ahmed, you may easily exchange your files, but your collegue is supposed
to style them on his own. 

Regards, Christine




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Re: [Qgis-user] Details about conversion DWG to SHP format.

[Christine]

Bonnet Clothilde wrote
> ...
> So, I wondered if the conversion of DWG file into SHP file using the
> following pathway, could induced some modifications in the rendering ?
> 
> step 1: convert DWG file into DXF file with DrafSight software
> step 2: convert DXF file into SHP file with Dxf2shp plugin under Qgis
> 
> How can I detect these modifications and idenfy the nature of them ? Does
> exist another method to create SHP file from DWG ?
> ...

dear Clothilde, 
very often there will be no change in geometries of your features - as long
as no arcs or curves are included in your CAD file (dwg or dxf). If there
are arcs or curves, they have to be approached with a set of straight lines
as shapefiles allow only simple geometries and cannot save curves. Thus you
might get similar but more or less different geometries if you convert CAD
data to shapefile format. 

To avoid this issue you may use e.g the Geopackage format as a modern
substitute for stone aged shapefiles or use the dxf format. 

Regards, Christine



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Re: [Qgis-user] calculating progressive value

[Christine]

Salvatore Oliveto wrote
> Hi, I have a Qgis layer with a table with twno columns X and Y.
> The X column has a set of values​​, while in the Y column I have to enter,
> using field calculator, for each record the progressive value. Eg : X
> column values: a , b , c , d ; Y column values (to be calculated with the
> field calculator from Y column): a; a + b; a + b + c; a + b + c + d.

Hi Salvatore, 
not really sure, if I understood you properly, but you can use a "case when
... then ... else" condition in field calculator. Please adapt the following
pattern to your needs:

CASE 
WHEN X = a THEN a
WHEN X = b THEN a+b
WHEN X = c THEN a+b+c 
WHEN X = d THEN a+b+c+d
ELSE 'error value'
END

Hope this helps,
regards, Christine






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Re: [Qgis-user] QGIS mobile

[Christine]

Uwe Fischer wrote
> does anybody know an Open Source alternative to ArcPad for a Windows
> mobile
> GPS handheld? As far as I know, QGIS mobile can only be run on Android.
> 
> All I found on Google was gvSIG (which seems to be dead since 2010) or
> questions from other people searching the same as I.

gvSIG mobile is OK and a good alternative to ArcPad. Works for me as a stand
alone mobile GIS on an old Windows mobile 2003 system. Due to memory
capacity I must restrict open programs to only that gvsig mobile on my
device. But it actually works smartly apart from that and with a newer
Windows mobile you shouldn't meet this problem. 

It's not possible to exchange data with a gvsig desktop installation (tried
it with all versions) - and never got an answer from the spanish developers
on a question concerning this. Pity, could have been great.  

Regards, Christine



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Re: [Qgis-user] How to create valid new shapefiles with qgis and a buffer around?

[Christine]

Had a look at your *.prj files and they indicate your shapefiles have
geographic coordinates. If you want to make metric calculations - and a
buffer is something like that - you should better define your shapefile with
a projected coordinate system (e. g. Gauss-Krüger or UTM) and choose a
projection for your project. 

You can easily project you shapes with "save as ..." selecting a projection
of your choice. 

regards, Christine



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Re: [Qgis-user] field calculator remains hidden | solved

[Christine]

Reset of QGIS settings seemed not to affect the settings for field calculator
much. Actually the field calculator had been moved to a region where I
couldn't reach it any more, although there was no second screen available
(have only one). For me it seems as if the long decimal places of a WKT
coordinates calculation had exploded somehow the dialog box (automatical
resizing ?) and caused a shift. 

On the left border of my screen I recognized recently the right border of a
dialog, but couldn't grap and move it to the center of the screen. Changed
screen resolution to a lower value and back again and that helped. Field
calculator dialog behaves now as usual.  

Thanks a lot for all hints,
regards, Christine



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[Qgis-user] field calculator remains hidden

[Christine]

Since a few days I have to deal with a permanently hidden field calculator.
Can call the field calculator with the button(s) and it seems to be open,
but it keeps always hidden. That means, I can't see this dialog and other
QGIS dialogs (attribute table window/dialog) and windows (map window) are
blocked. Can close the calculator dialog only with the menu, that is exposed
when hoovering the cursor over QGIS icon in the task bar. 

This problem occured first time in QGIS 2.4* after I tried to calculate a
WKT geometry of some polygons in a text field when the field calculator
dialog resized to very broad (too many decimal places of the coordinates). I
am afraid this automatic resizing exceeded a plausible value that has been
stored and now the calculator dialog can't be shown again. 

Have also installed QGIS 2.12 on the same machine and the problem now
concerns also this version although it wasn't caused by it. So I assume,
there are common settings used for both versions. Can anybody point me to
this place and give some advice how to reset the values for field calculator
dialog ?

Field calculator is really great in QGIS - but you should see it in order to
enter something ... 
Thanks a lot and regards, Christine
_
* on Windows 7, 64 bit machine



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Re: [Qgis-user] Legend in Composer

[Christine]

Hi Pat,

you can restrict the legend layers in the legend items properties dialog
this way: 

Select the legend item with the 'select/move item tool'. Then go to the
'item properties' tab on the right side of your screen, scroll there for the
'Legend items' section (marked with a triangle). Select all the legend items
you don't want and eliminate them with the minus symbol. 

regards, Christine



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Re: [Qgis-user] Counting instances of points and representing totals

[Christine]

Good morning,

what about creating a buffer with a distance of your choice and counting the
points inside the buffer (count points inside polygon)? If you dissolve the
buffers, you should get the sum of accidents in a range defined by you
buffer distance. That could help in case your accident points have not
exactly the same coordinates although beeing very close. 

For visualisation you could then use either the buffer area (e.g. classified
with colours) or points with the sum of accidents from centroids of the
buffers (e.g. symbol sizes). 

What you want to do, seems to be a hotspot analysis that could be solved
with CrimeStat ( Wikipedia <https://en.wikipedia.org/wiki/CrimeStat>  , 
Official Website <http://www.icpsr.umich.edu/CrimeStat>  ) ...

Regards, Christine



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Re: [Qgis-user] Template Composer

[Christine]

Hi Paolo,

a QGIS map composer template is not the same as an ArcGIS LYR-File. It saves
only the arrangement of your map composition elements, but no references to
the data of your map (as I remember). Actually that makes it easier to
transfer a certain layout (location and dimensions of map window, legend,
company or agency log etc.) to other projects with other data. 

To insert your data in an imported layout (*.qpt) you have to select the map
in the map composer, go to the 'item properties' tab and then in the section
of 'Extents' you have to click the button 'set to map canvas extent'. Your
data should be turn up in the (composer) map. Probably you need then to fit
scale and perhaps some other properties to your needs. 

Good luck, Christine







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[Qgis-user] Polygon shapefile not visible if overlapping another shapefile

[Christine Griffiths]

Dear All,

 

Any help would be much appreciated as I am starting to go insane!

Every time I draw a polygon shapefile in qgis 2.2 it will only shows up if
it does not overlap another shapefile. I cannot fathom why it is not
visible. I never had this problem in QGIS 1.8. This new shapefile is at the
top of my table of contents. 

 

Thanks

Christine

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Re: [Qgis-user] NAS format via OGR/PostNAS ?

[Christine]

Recently I got an exported set of data from ALKIS to the shapefile format
(probably standard export). Really not handy and necessary to be processed
time-consumingly in order to work with it. As the data model of the cadastre
data was changed, there is a preprocessing necessary - at least for our
applications. Could be probably better done with a database than with these
shapefiles. 

There exists a PostNas interface * of the Wheregroup which shall be now
implemented in OGR ( Project page http://trac.wheregroup.com/PostNAS  , 
Flyer
http://trac.wheregroup.com/PostNAS/export/319/trunk/flyer/PostNAS.pdf  )
(in german). So it should be also available in QGIS, isn't it ?

* PostNAS features (according der flyer):
- providing NAS Import via ogr2ogr
- Conversion of all levels and feature classes 
- support of NBA process (?)
- Analysis of NAS source data via ogrinfo
- suppport of PostgreSQL/PostGIS, ESRI Shape, Oracle, MapInfo etc.
- preprocessing as a OGC WMS- and WFS service via UMN MapServer
- searching modules 
- scripts, test data, manual 

Sounds promising. 



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Re: [Qgis-user] NAS format via OGR/PostNAS ?

[Christine]

Does nobody know about NAS (Normbasiertes AustauschFormat = norm based
interface) and possible usage in QGIS ? 
Or should I post this to the developers list ? 

Regards, Christine 
 
Original question on Nabble:
http://osgeo-org.1560.x6.nabble.com/NAS-format-via-OGR-PostNAS-tp5104870.html



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Re: [Qgis-user] NAS format via OGR/PostNAS ?

[Christine]

Thanks a lot, Bernd, for your efforts. 

Didn't found NAS listed in the QGIS file open list, so I assumed it won't
work yet. How stupid. 
Will try it as soon as possible by myself.

Regards, Christine




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Re: [Qgis-user] Change the Field type (.dbf)

[Christine]

Sławomir Bienias wrote
 
 ...
 I need to have Attribute Table with specific type of field - Integer
 (4,0). 
 
 
 Is there any way to change field type in DBF table in QGis? 
 
 
 
Have you tried in QGIS to write the content of your real field to a new
integer (4) field using the attribute calculator ? 
[Open attribute table  toggle editing  Open field calculator (right button
below attribute table, should be active) ]
Create a new field with Definition Integer 4 and give it a NewFieldName. In
the expression field write: OldFieldName

Did a test and it worked with a shapefile. 

Regards, Christine



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Re: [Qgis-user] too long field

[Christine]

If you mean the length of the field name being already 10 characters long,
you might rename/abbreviate the field name using the Table Manager plugin.
Another way would be creating a new field with a shorter name and writing
the given values to the new field with the field calculator  ... 

Regards, Christine

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Re: [Qgis-user] default print template

[Christine]

Have created a simple print composer template with the classical elements
(north arrow, scale bar, scale text, legend and frame). If you like, you may
use as a starting point for own customizations. 

Regards, Christine
http://osgeo-org.1560.n6.nabble.com/file/n4980247/QGIS_MapComposer_Template_simple.qpt
QGIS_MapComposer_Template_simple.qpt 

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Re: [Qgis-user] shapefile/dbf number limitation?

[Christine]

Thanks for the hint, Zirneklitis !


You can't use REAL field type for ID as it a bit approximately, e.g., 
number '1234567890123456789' will memorised as '1,23456789012347E+018'.
The INTEGER should be used instead. 
... 

Wasn't our/my idea to do so. The file was created by authorities and we had
to process it. 
Seems, that this works with the given definition in ArcGIS - however ESRI is
achieving that. 

Regards, Christine

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Re: [Qgis-user] default print template

[Christine]

 ...,  I don't want to each time I open the composer to load the template,
...

Well, if you create a new QGIS project, in the print composer you have only
to load a template (*.qgt) once. It will be saved with the project file
(*.qgs). Actually you can load and save several templates/map compositions
in the map composer of a QGIS project. You may also rename or delete them,
if you like. 

There will never be a template that will satisfy the needs of all/many
users. A good idea could be creating a collection of templates for different
purposes, so users might choose and download their favorites - similar like
with the plugins. 

Regards, Christine


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[Qgis-user] Re: shapefile/dbf number limitation?

[Christine]

We use QGIS 1.7.4 on Windows machines. 

regards, Christine

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[Qgis-user] Re: Delete columns of a .shp file with GDAL/OGR 1.9.0

[Christine]

hi Andrea,

using QGIS for a year now, I could never delete a shapefile column. Had to
switch to ArcGIS or gvSIG to achieve this. So, I took this for normal in
QGIS ... 

regards, Christine

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[Qgis-user] Re: SEXTANTE for QGIS has been released

[Christine]

have already nearly missed your SEXTANTE modeler in QGIS, Victor. 
Thanks a lot for these new prospects, 
Christine

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[Qgis-user] Re: Raster banding in print composer

[Christine]

you mean the darker horizontal crossing blue lines, isn't it? 

Had a problem with broader stripes (alternating coloured and void) on a map
print from QGIS 1.6 composer sometime last year as well. I am not sure any
more whether this ocurred with a raster, could be with vector data. Solved
it by printing to PDF (with PDF creator). 

regards, Christine

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Re:[Qgis-user] resizing Layer Properties window

[Christine Schmidt]

hi Terry,

yes I know this problem. Have it also in QGIS running on my tablet  field PC 
(Windows 7 Prof). The display of the device has only 7'', so I have to rotate 
it in order to save changes. 

Similar thing  with the attribute table of a layer. Can't customize the size of 
the attribute table for my field device. Even if I there are only two columns, 
the table fills a great part of the screen because there seams to be a fixed 
minimum width (about 6+ columns). 

regards, Christine



Betreff:  [Qgis-user] resizing Layer Properties window 
Von:  ropew...@shaw.ca  
An:  qgis-user qgis-user@lists.osgeo.org 
Datum:  23.11.11 03:31:54

Hello

 A problem with my netbook computer - if I open a layer properties box the 
lower part is off the screen with the result I am unable to save any changes

It isn't possible to re-size the box as the top drag bar doesn't work and the 
bottom one is off the screen, is it possible to edit the config file so it 
loads a reduced size box? ...or could someone fix the problem

 Interestingly things like the Add Vector Layer window can be re-sized with the 
top drag bar

With thanks, Terry

Ubuntu 11.04 (kernal Linux 2.6.38-12)
QGIS 1.7.2
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Re: [Qgis-user] ArcGIS 10 and QGIS 1.7

[Christine Schmidt]

hi,

thanks for your replies.
I remember a post in a QGIS forum rather than in this list to deal with that 
subject. But I could not find this thread any more. So, it's not only an 
assumption why I posted this question in the list, but I could not verify the 
circumstances and details of  the original thread any more

Well, if that's not a known problem, I will have to try it on my own. Have 
already created an image of my harddisk, so I might roll back to a working QGIS 
1.7 version in a bad case. 

Christine





-Ursprüngliche Nachricht-
Von: Andreas Neumann a.neum...@carto.net
Gesendet: 25.08.2011 09:16:53
An: qgis-user@lists.osgeo.org
Betreff: Re: [Qgis-user] ArcGIS 10 and QGIS 1.7

 Hi,

 I don't think that QGIS' ArcGIS' python installations get into their
 ways. I think they both bring along their own local python
 installations. Do you have any indication that the two interfere with
 each other or is it just an assumption?

 It is quite common that machines have multiple python installations in
 parallel.

 Andreas

 On Thu, 25 Aug 2011 08:51:46 +0200, Frank Sokolic wrote:
 Hi Christine,

 I recently had a problem on Windows XP when I uninstalled 1.7,
 installed and uninstalled 1.6, and then installed QGIS 1.7 again.
 QGIS
 1.7 kept on crashing and I eventually traced the problem to Trolltech
 keys in the registry. After removing Trolltech from the registry and
 then reinstalling 1.7 everything worked again.

 Regards, Frank.

 -

 FROM: c.schm...@geotguide.de
 SENT:2011-08-24 21:48:16
 TO: qgis-user@lists.osgeo.org
 CC:
 SUBJECT: [Qgis-user] ArcGIS 10 and QGIS 1.7

 Good evening all,

 have recently installed QGIS 1.7 on a Windows XP machine. It works
 really fine and I havn't met any difficulty until now. Thanks to this
 really engaged community ...

 Should install a time limited version of ArcGIS 10 for educational
 purposes now on the same machine. Should have better done this in
 another succession, I know. Remember some troubles mentioned in this
 list with ArcGIS beeing installed after QGIS, as ArcGIS also uses
 Python.

 Because I am now in worry about my clean QGIS installation, I am
 considering to uninstall QGIS 1.7, then install ArcGIS 10 and after
 all install QGIS 1.7 again.

 May I expect the uninstall process of QGIS beeing complete enough not
 to get another trouble after a second installation of QGIS 1.7 ?

 Thanks for an advice,
 and regards,
 Christine

--
 --
 Andreas Neumann
 Böschacherstrasse 10A
 8624 Grüt (Gossau ZH)
 Switzerland
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[Qgis-user] ArcGIS 10 and QGIS 1.7

[Christine Schmidt]

Good evening all,

have recently installed QGIS 1.7 on a Windows XP machine. It works really fine 
and I havn't met any difficulty until now. Thanks to this really engaged 
community ... 

Should install a time limited version of ArcGIS 10  for educational purposes 
now on the same machine. Should have better done this in another succession, I 
know. Remember some troubles mentioned in this list with ArcGIS beeing 
installed after QGIS, as ArcGIS also uses Python. 

Because I am now in worry about my clean QGIS installation, I am considering to 
uninstall QGIS 1.7, then install ArcGIS 10 and after all install QGIS 1.7 
again. 

May I expect the uninstall process of QGIS beeing complete enough not to get 
another trouble after a second installation of QGIS 1.7 ? 

Thanks for an advice,
and regards,
Christine



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Re: Re: [Qgis-user] Processing of Groundwater Databases with QGIS

[Christine Schmidt]

Hi Bob,
thanks for the feed back. 
Do you capture groundwater level data in boreholes and in monitoring wells with 
this plugin to store it in a database? Sounds interesting although I wasn't 
searching exactly for that.

Want to process data of existing groundwater databases with QGIS. Processing 
means precisely the interpolation of groundwater level data and laboratory 
analysis data for groundwater monitoring wells. 

I am checking what is already present in this field and what could perhaps be 
contributed for an efficient workflow. 

Regards,
Christine



--
  Von: Bob and Deb bobd...@gmail.com
  Gesendet: 25.05.2011 18:31:57
  An: Christine Schmidt c.schm...@geotguide.de
  Betreff: Re: [Qgis-user] Processsing of Groundwater Databases with QGIS

Hi Christine,
I've been working on a borehole data entry plugin.  We are using it to 
record historical high groundwater for use in liquefaction zone mapping.

Are you looking for this kind of use cases?

Regards,
Bob

On May 25, 2011 9:03 AM, Christine Schmidt c.schm...@geotguide.de wrote:
 Dear QGIS community,

 would like to post my first question in this mailing list as follows:
 a.. Does anybody know something about a project or use case of processing 
groundwater databases with QGIS, exspecially in order to make interpolations of 
point data (well data) ?
 Got to know something similar in the context of GRASS (Carrera-Hernandez, 
2007). But what about QGIS in this application field ?

 Thanks a lot for any feedback,
 warm regards,
 Christine

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Re: Re: Re: [Qgis-user] Processing of Groundwater Databases with QGIS

[Christine Schmidt]

Hi Giovanni,

thanks for your hints !
Most of the mentioned methods I know more or less.
Important for the evaluation of an interpolation's reliability is a review 
of the variogram and some statistical values. This should be also possible 
in QGIS, as far as I could see until now - if not directly, then via R or a 
GRASS plugin.


This would be more than I have now in a proprietary groundwater database 
management system with integrated interpolation functionality. That's why I 
am looking for an alternative processing option.


I am about to develop a subject for a master thesis in geoinformatics. First 
of all I want to check what is present in the field in order to decide what 
I can manage and contribute to proceed in this application field.


tanto gracie e saluti,
Christine




-Ursprüngliche Nachricht-
Von: G. Allegri gioha...@gmail.com
Gesendet: 26.05.2011 00:21:46
An: Christine Schmidt c.schm...@geotguide.de
Betreff: Re: Re: [Qgis-user] Processing of Groundwater Databases with QGIS


Spatial interpolation can be realized in many ways. There are lot
different methods, which fit different needs.

- Inverse Distance Weighting (IDW)
- B-Splines
- Kriging
- Statistical simulations
- etc.

As you know, none of them is correct without a knowledge of the
groundwater structure and stratygraphy. Anyway, in general, for this
kind of elaborations, IDW and kriging are mostly used.

AFAIK, QGis can do IDW [1], while the other methods will need external
softwares like GRASS and R. In this case the related QGis plugins can
be used.

If you can give us more details on the kind of interpolation you nedd,
we could give more advices.
Giovanni

[1] 
http://www.gistutor.com/quantum-gis/20-intermediate-quantum-gis-tutorials/51-inverse-distance-weighting-idw-interpolation-using-qgis.html


2011/5/25 Christine Schmidt c.schm...@geotguide.de:

Hi Bob,
thanks for the feed back.
Do you capture groundwater level data in boreholes and in monitoring 
wells

with this plugin to store it in a database? Sounds interesting although I
wasn't searching exactly for that.

Want to process data of existing groundwater databases with QGIS. 
Processing
means precisely the interpolation of groundwater level data and 
laboratory

analysis data for groundwater monitoring wells.

I am checking what is already present in this field and what could 
perhaps

be contributed for an efficient workflow.

Regards,
Christine




Von: Bob and Deb bobd...@gmail.com
Gesendet: 25.05.2011 18:31:57
An: Christine Schmidt c.schm...@geotguide.de
Betreff: Re: [Qgis-user] Processsing of Groundwater Databases with QGIS

Hi Christine,
I've been working on a borehole data entry plugin. We are using it to
record historical high groundwater for use in liquefaction zone mapping.

Are you looking for this kind of use cases?

Regards,
Bob

On May 25, 2011 9:03 AM, Christine Schmidt c.schm...@geotguide.de 
wrote:

Dear QGIS community,

would like to post my first question in this mailing list as follows:
a.. Does anybody know something about a project or use case of 
processing
groundwater databases with QGIS, exspecially in order to make 
interpolations

of point data (well data) ?
Got to know something similar in the context of GRASS 
(Carrera-Hernandez,

2007). But what about QGIS in this application field ?

Thanks a lot for any feedback,
warm regards,
Christine



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[Qgis-user] Colour properties of raster layers

[Rosenkranz, Brigitte Christine]

Hi,

I just started using Q-Gis and I have problems with using the color maps for my 
raster layers.
I have a huge amount of ASCI grid raster files (elevation data from Danmark) 
and I try to open as much files/layers as possible at once. It seems like per 
default the chosen color map is greyscale. I would like to open my files in a 
customer defined colormap. I would also like to define the customer color map 
in a different way then it is default. Because I have a huge amount of files it 
is very unconvenient to open the properties for each layer.

Now my question is comming d:o)
Is there any possibility to define these settings for all raster layers at 
once? So that I don't have to klick 9000 times for having the same colours in 
all my layers?

Thanks a lot for helping and best regards from sunny Danmark,
/Gitte

--
Brigitte Rosenkranz
Kort  Matrikelstyrelsen
National Survey and Cadastre
Rentemestervej 8
DK-2400 København NV
Dir. tlf. +45 72 54 5203
e-mail: [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] 
Tlf. (+45) 72 54 50 00
Fax. (+45) 72 54 50 51
--

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