Re: [Qgis-user] how does QGIS generate the EPSG from a Shapefile?

[ralfwessels]

Hi Rodrigo,

Only if the shapefiles contain a prj-file (with the right informations about
the coordinate system) QGIS opens it automatically correct.

If you use shapefiles with OGR you either need to specify the EPSG Code like

   ogr2ogr -a_srs EPSG:2066 output.shp input.shp

or - if you have - the prf-file like

   ogr2ogr -a_srs input.prj output.shp input.shp







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Re: [Qgis-user] Cannot load WFS data

[ralfwessels]

hi guglhupf,
I just tried it with QGIS 2.14-6 and after a few minutes I cancelled the WFS
request, because nothing happened. On the Website of the provider
(http://www.stadtentwicklung.berlin.de/geoinformation/geodateninfrastruktur/de/geodienste/wfs.shtml)
it says, that this service has 24.323 poly objects. This is quit a lot and I
tried it with the filter  "BEZIRK"  = 'Mitte' to reduce the amount of
objects. 
Then it worked like charme an I got 1.369 poly objects within the district
'Mitte'.
Ralf



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Re: [Qgis-user] Cannot load WFS data

[ralfwessels]

Hi Heinrich,
yes all the  1.369 polygon objects were loaded and rendered correctly in my
QGIS, when I used the filter "BEZIRK"  = 'Mitte'.  I also tried it with
"BEZIRK"  = 'Pankow' and it also worked out well, but it took 2:13 min to
load the 2.698 poly objects.
In QGIS you can set an individual timout for network requests under Settings
> Options > Network Menu (Einstellungen > Optionen > Netzwerk). Default is
6 ms (60 seconds). 
In my QGIS I set the timeout up to 6.000.000 to load bigger data or in case
the internet connection is slow.
When I tried to load the WFS-data with default timeout, after 60 seconds I
got the (german) error message "Zeitüberschreitung bei
Netzwerkabfrage...dauerte zu lange"
Ralf



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Re: [Qgis-user] Cannot load WFS data

[ralfwessels]

Hi Heinrich,
I tried WFS
"http://fbinter.stadt-berlin.de/fb/wfs/geometry/senstadt/re_0411_str_2010";
and also got only 1000 objects, so I guess this is a provider problem from
SenStadtUm.
I tried it with the normal QGIS WFS loader, with the QGIS Plugin "WFS 2.0
Client" (because the service is also provided in WFS 2.0 and with ArcGIS,
but in all cases I just got 1000 objects.
In your case I would contact thw Senatsverwaltung für Stadtentwicklung und
Umwelt Berlin under +49-30-90139-5257 and ask for problems with this
service. About 2 years ago I had similar problems getting data over WFS from
here and the told me that they had some technical problems, so they sent me
the data as Shapefiles - they were very friendly!

I also figured out that the option "only request objects intersecting with
current view" is also not working for me - just got 1 object, so I guess
this is a bug.
The good thing is, this option is also available within the Plugin "WFS 2.0
Client" and here it works
Ralf



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Re: [Qgis-user] Bug openlayerplugin QGIS 2.18 on UBUNTU16.10

[ralfwessels]

Hi Gianni,
The Open Layer Plugin is not the first choice for using basemaps anymore.
Much better and more stable ist the Plugin "QuickMapServices"
Ralf



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Re: [Qgis-user] Bug openlayerplugin QGIS 2.18 on UBUNTU16.10

[ralfwessels]

Hi Gianni,
if you want to use Google, BING or many other basemaps with the Plugin
"QuickMapServices", you have to activate "Get ContributedPack" in the
"QuickMapServices" settings under "More services"
Ralf



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Re: [Qgis-user] Drones in forestry

[ralfwessels]

Hi Piotre,
don't know much about drones, but nowadays you can get a lot of high
resolution satellite images (below 1m) where you schould identify holes in
forests.
I guess prices for these are cheaper than a drone and you will have much
less work to analyse the data.
Ralf



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Re: [Qgis-user] Edit in coordinates for points manually

[ralfwessels]

Hi Lene,

there is a panel called "Vertex Editor" which is available when you start
the Node Tool to edit vertices in point, lines and polygons.
Here you can edit by writing the x,y coordinates.
I don't know if it should show up automatically, but if not you have to
activate this panel under View > Panels.  You can only activate it, when the
Node Tool is selected before.

This is for editing. If you like to digitize points by writing the
coordinates I can recommend the "NumericalDigitize"-plugin.
Ralf



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Re: [Qgis-user] raster borders as a vector polygon file

[ralfwessels]

Hi Giacomo,

try   Raster > Miscellaneous > Tile Index...

this gives you polygons for all rasters in one directory.

actually I use QGIS 2.14.10

Ralf



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Re: [Qgis-user] Qgis-user Digest, Vol 141, Issue 27

[ralfwessels]

Hi Hisham,

I don't know a QGIS-Plugin, but if you use QGIS with PostGIS, you have more
options.
2 approaches with PostGIS are:

ST_ApproximateMedialAxis  >> 
https://postgis.net/docs/ST_ApproximateMedialAxis.html
ST_StraightSkeleton  >>  https://postgis.net/docs/ST_StraightSkeleton.html

Ralf



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Re: [Qgis-user] Clipping a Raster

[ralfwessels]

Hi Mark,
you can do it, like Stefan suggested or if you are looking for the function
in the "Raster" menu, you first have to activate the "GdalTools" plugin.
After that you will find the Clip function under Raster > Extraction >
Clipper...

Ralf




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Re: [Qgis-user] How to build Topology for Line layer

[ralfwessels]

ji AJAY,

the best tool I know (and use) to repair/fix geometries is the GRASS
function v.clean.
It has lots of possibilities and you find it in the Processing toolbox.

ralf



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Re: [Qgis-user] Distance matrix issues

[ralfwessels]

Hi Laura,
I had also problems generating a distance matrix, but then I recognized that
I was working with multipoints. Changing the multipoints to 'normal' points
solved the problem for me.
ralf



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Re: [Qgis-user] joining attributes of polygon vector layers

[ralfwessels]

hi,

try Vector > Geoprocessing Tools > Intersect
In the new shape you will have the attributes from both intersecting layers
ralf



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Re: [Qgis-user] joining attributes of polygon vector layers

[ralfwessels]

/Hi Ralf,

I just want to 'crop' only one attribute column. I'm figuring out there's no
direct way to do it.
Thanks./

Hi,
you also can use the function Vector > Data Management Tools > Join
attributes by location but as Intersection you'll get all attribute and have
to delete (very easy with Table manager) these you don't want.
So far I know, there is no QGIS-tool just to 'crop' one attribute.
ralf







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Re: [Qgis-user] Layer Offset

[ralfwessels]

Hi mflue,
the postalcodes from Arnulf are not only (a little bit) shifted, they are
also pretty old.
Last year I worked on a project creating up to date postelcode areas from
Germany on the base of OSM-data.
You can download these on http://www.ralf-wessels.de/Links.html (click on
the "PLZ Download"-link).
have fun
ralf



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Re: [Qgis-user] Error installing qgis2leaf

[ralfwessels]

Hi,
this is a realy nice new plugin.
It works for me on QGIS 2.2 (Windows 7) but not in all cases. 
I made 3 tests and in one of these tests the plugin didn't work anymore (no
window opened). When I started QGIS again the plugin worked fine.
ralf



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Re: [Qgis-user] QGIS Gruppe Germany Berlin

[ralfwessels]

Hallo Daniel,
sehr nette Idee - wenn ich an den entsprechenden Terminen Zeit haben sollte,
bin ich gerne dabei.

Ralf



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Re: [Qgis-user] Stress about release plans

[ralfwessels]

Hi,
I'm also a trainer for QGIS software (I have 2-week-courses every 3 month)
and I fully agree with Lene's concerns about the (new) release time
schedule.
And - in my opinion - it is not only much more work for QGIS trainers to
keep their papers up-to-date. 
I think it also confuses the QGIS users to update their product every 3
month.
I really like Lene's idea of a long term stable version!

best greetings from Berlin
Ralf



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[Qgis-user] problem with reshape features tool in epsg_4326 (wgs84)

[ralfwessels]

Hi,

I'm using QGIS 2.4 (Standalone installer) on Win 7 (64bit)

When I was editing polygons and used the reshape tool I always got the error
message "unknown exception". I tested this with other polygon shapes and
PostGIS-Layers and figured out, that the error only shows up, when I tried
to edit features stored in srid 4326. 
The reshape tool works fine with features in other srids like 3857 or
25833(german srid).
Can someone reproduce this problem/bug?

ralf



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Re: [Qgis-user] Which topics would you choose for a QGIS workshop

[ralfwessels]

. do not forget the Plugin-architecture and show some nice examples like
OpenLayers Plugin or TableManager.
ralf



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Re: [Qgis-user] Field calculator QGIS2.4 division error

[ralfwessels]

Hi Ivan,
what type of data (integer, real, string) are HC01_VC04 or HC01_VC03 and
what type od data you defined for the new column you want to create?

If the new column is real, try to use 100.0 (with decimal) instead of 100.
ralf



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Re: [Qgis-user] Field calculator QGIS2.4 division error

[ralfwessels]

Hi 
intereseting, didn't know the left to right rule explained by Zoltan:

Siki Zoltan wrote
> 100.0 * "HC01_VC04"  /  "HC01_VC03" will give you the right result. 
> First the multiplication is evaluated (left to right rule),...

Learning never stops!
ralf



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[Qgis-user] legend feature count - 2 values

[ralfwessels]

hello,
Does somebody know, why (when feature count in the legend is activated)
there are 2 values  - one behind the name and one behind the symbol?


 

And why they are sometimes different (like in my example of a shapefile)?
In my opinion the value behind the symbol is correct, but what is the other
value for?

ralf





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Re: [Qgis-user] R: Re: How to import a Google map

[ralfwessels]

Hi Marilena,

What Google tool did your colleague use to create that map? 
the classic Google "My Maps" or the new "Google Maps Engine"
Did your colleague give you the right to edit/see the map or made themap
public?
Maybe it is possible to provide a link to that map?

ralf



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Re: [Qgis-user] R: Re: How to import a Google map

[ralfwessels]

hi Marilena,

thanks for providing the link to that map.
Unfortunately I don't have the right (access) to this map - if someone
creates a map with Google tools, he (the owner) can give access to others by
sharing the map, but in that link I can see, that this map from your
colleague was created with Google Map Engine.
Here 
https://support.google.com/mapsenginelite/answer/3109452?hl=en&ref_topic=3526007

  
it is described how to export layers of the map as kml.
ralf



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Re: [Qgis-user] R: Re: R: Re: How to import a Google map

[ralfwessels]

then you probably have 2 Shapes with different coordinate systems - kml is
always wgs84 (epsg:4326).
You have to enable 'on-the-fly' CRS transformation, then it should fit
together.

If you need a background map, try the "OpenLayers Plugin". Ther you have the
choice between Google, OSM, Apple and some other basemaps.
ralf



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Re: [Qgis-user] legend feature count - 2 values

[ralfwessels]

Hi Jose,
thanks for your answer.
That makes sense and I tested it using the "Rule-based" method under Styles
- it works like you explained.
 best greetings from Berlin

ralf



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Re: [Qgis-user] How to Make a project layer editable

[ralfwessels]

Hi Tom,
in QGIS you can only edit layers, when they are stored in the data formats
shapefile, SpatialLite, PostGIS or other databanks.
So if you want to edit your layer, you first have to save as shapefile or
import to a databank.
ralf



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Re: [Qgis-user] QGis suddenly started to emit a sound....

[ralfwessels]

hi Alessio,
you probably have a file with special characters like ä,ü,ß.
Just rename your file and do not use any special character!
ralf



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Re: [Qgis-user] Algorithms not preserving CRS for EPSG:32647 UTM zone 47N

[ralfwessels]

Hi,

I had the same experience when using GRASS-Tool v.clean from the Processing
Plugin. 
Maybe there is some kind of bug when using GRASS-Tools?

Also using Windows 7, QGIS 2.4.0-Chugiak

Ralf



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Re: [Qgis-user] Area calculation tools

[ralfwessels]

Hi Stephane,
if you calculate areas (or length) with the "Add geometry Columns"-Tool, the
results depend on the settings you can make under "Calculate using". Here
you have the options Layer CRS, Project CRS or Ellipsoid.
Ellipsoid is calculating with the curvature of the earth (so far I know) and
the others depending on the CRS' of the layer or the project (when 'on the
fly' CRS transformation is enabled).
If you are using $area in the field calculator it depends if 'on the fly'
CRS transformation is enabled or not.
If it is not enabled it calculates with the layer CRS, if it is enabled it
should calculate with the project CRS.

These are my testing experiences so I'm not 100% sure, but maybe there is
someone who has more informations about this topic.
ralf





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Re: [Qgis-user] Joining connected lines

[ralfwessels]

Hi Henrik,
seems that there is no solution with QGIS for your problem and I also don't
know a function which merges "connected" lines in QGIS.
But there is the PostGIS-function "ST_Touches" which could help.
ralf




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Re: [Qgis-user] Which tool/referecence for adress geocoding ?

[ralfwessels]

hi image93,

there is a nice geocoding tool within the QGIS Plugin "MMQGIS" where you can
load csv-files and geocode with Google or OSM data (Nominatim).

You also can use the GPSVisualizer service at
http://www.gpsvisualizer.com/geocoder/ where you also can geocode multiple
addresses - here with Google, Bing or MapQuest but you need to generate a
key before.

Consider that all of the geocoding services have limits except if you
geocode addresses with Nominatim but here the results mostly not so precise.
Ralf



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Re: [Qgis-user] Zoom settings

[ralfwessels]

hi Massimo,

... or do you use the TileMapScalePlugin?
If you use this, it could be that the option "activate zoomlevels" is
activated and normaly the max. zoomlevel then is 18 - similar to 1:2256
ralf



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Re: [Qgis-user] Openlayers Plugin / WMS : update, accuracy ?

[ralfwessels]

hi image93,

to 3: You probably won't find more recent data served by WMS and providers
like Google, Microsoft or Apple will not serve mapdata by WMS at all (just
as tiles).
But there are some OSM mapstyles served as WMS. At OSM wiki you will find a
list of possible WMS based on OSM data
(http://wiki.openstreetmap.org/wiki/WMS).
Another big advantage using WMS instead of tiles from the OpenLayers Plugin
is the much better quality when printing e.g. as background map.
ralf



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[Qgis-user] Labels disappear after Join

[ralfwessels]

Hi all,

can someone reproduce that labels disappear when you join the labeled layer
with some other dataset? The assigned attribute field is gone and you have
to select it again from the dropdown menu.

I used QGIS 2.6.1 on Windows 7.

Ralf



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Re: [Qgis-user] SQL to update table

[ralfwessels]

hi Chuck,

if you just don't want to see the "NULL" in all the fields with no values,
you can change this in SETTINGS > OPTIONS > Data Sources.
Here under "Representation for NULL values" you can define your own field
value for all fields with no values.
Ralf



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Re: [Qgis-user] 2.8.2

[ralfwessels]

hi Chandler,
just download the 2.8.2 QGIS-Version and start the exe-file.
If 2.8.1 is installed on your machine, you will see following infowindow:

 

...so if you click OK, the old 2.8.1 version will be uninstalled, before
2.8.2 will be installed.
this works for me on my laptop with windows 7.
best greetings
Ralf



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[Qgis-user] QGIS 2.8.2 no values calculating area with Export/Add Geometry Columns on Ellipsoid

[ralfwessels]

Hi all,
I tested the area calculating functions in QGIS 2.8.2  and figured out, that
I just get zero values when using the function Vector > Geometry Tools >
Export/Add Geometry Columns calculating on Ellipsoid.
I tested it with shape-files and PostGIS-Layers with the QGIS Windows
Installer Version 64bit.
I suppose this is a bug in version 2.8.2 because it works in 2.6
In 2.8.2 it also works when calculating on Layer CRS or Project CRS, but not
on Ellipsoid.
Can someone reproduce this error?

Another strange thing when using the Export/Add Geometry Columns - function
ist the message (see screenshot) I always get when click OK to execute the
function.
 

Is this warning normal? I don't have the layers attribute table open.

Best greetings from Berlin
Ralf



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Re: [Qgis-user] QGIS 2.8.2 no values calculating area with Export/Add Geometry Columns on Ellipsoid

[ralfwessels]

SBL wrote
> Hi,
> 
> seems to be related to this one:
> https://hub.qgis.org/issues/12057
> (see esp. note 18)
> 
> Cheers
> Stefan

Hi,
thanks for that hint.
Could be that 'my' problem is related to the other problems "calculating the
correct area in QGIS".
The 'right way' to calculate areas in QGIS seems to be a never ending story
as I can remember bugs and errors in earlier versions, too.
I know calculating areas in GIS is a complex topic, because different
parameters can affect the result.
But - as area calculating is probably one of the mostly used functions in
QGIS - it should be possible to create a stable, easy and user-friendly
solution.
I'm a GIS trainer and as long QGIS has problems with this function I will
recommend my students to use PostGIS (ST_Area...) to calculate areas they
can trust.

best greetings from Berlin
Ralf
 



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Re: [Qgis-user] save as .gpx?

[ralfwessels]

Hi Michael,

I had the same problem saving gpx in QGIS and using it with OsmAND.
I figured out to set the Layeroption  "FORCE_GPX_TRACK = YES" when exporting
from QGIS to see lines in OsmAND and not points.
ralf



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Re: [Qgis-user] qgis geopole wms server search

[ralfwessels]

Hi,
yes the whole geopole service seems to be down - even the main website
http://www.geopole.org/ doesn't show up correct.
Does someone know an good alternative  searchmachine for global web
services?
In germany I normaly use http://www.geoinfomarkt.org/ which is pretty good,
but just for german web services.
I wonder if it's possible to use this service (or another good global
service) to implement as standard search service in QGIS?
Ralf



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Re: [Qgis-user] to change the location of several points on a map

[ralfwessels]

Hi Natalia,

try the Plugin "Vector Bender".
It does to vectors what georefencers does to raster. 

Good luck!

ralf



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Re: [Qgis-user] Geoprocessing dissolve tool

[ralfwessels]

Hi Julie,
I use QGIS (long-time) version 2.8.3  and the Geoprocessing dissolve tool
works pretty well here, either dissolve all or dissolve by attribute.
What version you are using?

You can also try other dissolve functions in the Processing toolbox
(Plugin). Here you have dissolve tools from GRASS, SAGA, GDAL  - just
type "dissolve" in the searchbox.

ralf



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Re: [Qgis-user] (no subject)

[ralfwessels]

Hi Springfield,

would be interesting to know what shortcut this is - for none Manifold GIS
users!

ralf



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Re: [Qgis-user] (no subject)

[ralfwessels]

hi Springfield,

ah ok, I just thought this is also implemented in QGIS, but I tried it on
QGIS 2.8.3 on Windows and it is not.
When I press the space bar during digitizing in QGIS, I can move the map
with my mouse, but snap is still activated.

. so I agree, it would be nice to have the same "snap stop"
functionality in QGIS like in ArcGIS or Manifold GIS.

ralf



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Re: [Qgis-user] HHK Geograf in QGIS

[ralfwessels]

Hi Sebastian,
it should be possible when you transform your date into dxf format, but then
you may loose some attribute data.
If there is a possibility to import the data direct to PostgreSQL/PostGIS, I
would prefer this method.
ralf




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Re: [Qgis-user] How set the border-style in an expression

[ralfwessels]

Hi Andrea,

tryCASE WHEN  $scale  > 10 THEN  'solid'  ELSE  'no'  END

possible border-styles are [no|solid|dash|dot|dash dot|dash dot dot]

ralf



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Re: [Qgis-user] QGIS - shp2kml

[ralfwessels]

Hi Ventura,
I guess you loaded your csv with "AddDelimited text Layer" into QGIS.
From here right click at the generated layer, use "Save As" and choose KML
as output format.
Under Datasource options  use "Description"in the DescriptionField
(standard) and in the NameField write the column title of you datasource you
want as "placemark title".
ralf



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Re: [Qgis-user] QGIS - shp2kml

[ralfwessels]

Hi Bart,
to let others participate at this discussion I'll publish your (direct) mail
and my answer here:


/Hi Ralf,
Thanks for your suggestion. I tried and it works. Do you know if there is
also the possibility to add other descriptor field using QGIS for creating a
kml?
Such as dimension of the placemark, type of placemark etc

Thanks in advance

Ciao  Bart /


If you want more descriptor fields - I guess you mean more attributes - you
have to create them in QGIS before exporting the dataset as kml.  The
fieldcalculator in QGIS provides a lot possibilities to create new
attributes.
Ralf 





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Re: [Qgis-user] Geological Symbols

[ralfwessels]

Hi Grant,

you can download a pretty good free svg dataset of geological textures (70),
geological symbols (70) and fossil symbols (30) here:
http://www.teuderun.de/freie-software/texturen-symbole/

It is a german source, but I guess geological symbols are global.

ralf



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Re: [Qgis-user] variables in postgis filters

[ralfwessels]

Hi,
interesting question.
I would like to filter my PostGIS table by the actual extent of the map
canvas similar to the possibility in the Quick OSM - Plugin.

Does someone know, if this is possible?

@Walter: try the "Spatial subset query plugin". This is maybe what you want.

Ralf



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Re: [Qgis-user] variables in postgis filters

[ralfwessels]

Hi,

I haven't looked at how the QuickOSM plugin deals with the issue, 
does it update the layer definition on every pan and zoom operations ? 

No, the QuickOSm-Plugin is not updateing on every pan or zoom - it just
loads the object for the current map extent (if this is not to big though).
But as a first step this would be ok to load data from PostGIS tables.

So if the QuickOSM Plugin uses the current map extents, thsee must be
accessible somehow.

ralf




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Re: [Qgis-user] variables in postgis filters

[ralfwessels]

Hi,

Any plugin can subscribe to receive notifications about canvas 
updates and can fetch information about the canvas (extent, scale). 

..but I guess (so far) it is not possible to use current extent informations
(e.g. as variable) within the sql filter options for PostGIS data tables.

ralf



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Re: [Qgis-user] Clip - unsupported geometrytype -2147483646

[ralfwessels]

Hi Lene,

if you store your data in PostGIS, you can use ST_GeometryType().

Example counting the objects by geometry type:
/SELECT COUNT(*) AS number, ST_GeometryType(geometry) AS geomtype FROM
mytable
GROUP BY ST_GeometryType(geometry)/

.but if there are different geometry objects in a dataset, the PostGIS
geometry data type should be "geometry"  and not "MultiPolygon",
"MultiLine...

ralf




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