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

[Firstname Lastname via Qgis-user]

Ok, thanks.

On Tue, Jun 21, 2022 at 8:43 AM David Strip 
wrote:

> On 6/21/2022 8:37 AM, Firstname Lastname via Qgis-user wrote:
>
> I have gone that far, but I have four sets of maps with similar units.  If
> I categorize them independantly, I have to manually change the colours to
> make them consistent between layers.   This is very time consuming and I
> was wondering if the colour can added to the attribute table so that I can
> edit them more easily
>
> On Tue, Jun 21, 2022 at 2:56 AM  wrote:
>
>> 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
>>
>
> Assuming all the shapefiles use the same name for the attribute you will
> use for categorization, you can save the styling to a style file from the
> Symbology tab of the Properties dialog. Do this once, then load the style
> file to the other layers.
>
-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414
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Re: [Qgis-user] polygon fills from different shapefiles

[Firstname Lastname via Qgis-user]

I have gone that far, but I have four sets of maps with similar units.  If
I categorize them independantly, I have to manually change the colours to
make them consistent between layers.   This is very time consuming and I
was wondering if the colour can added to the attribute table so that I can
edit them more easily

On Tue, Jun 21, 2022 at 2:56 AM  wrote:

> 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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Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414
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[Qgis-user] polygon fills from different shapefiles

[Firstname Lastname via Qgis-user]

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] digitizing

[Firstname Lastname via Qgis-user]

I think that there is something wrong with the Tif file I was using.  I had
the same problem with a couple of files but I went back to the source file
and redid the referencing and it is ok.

On Thu, Jun 16, 2022 at 7:46 PM Patrick Dunford via Qgis-user <
qgis-user@lists.osgeo.org> wrote:

> This is a generic answer, as more information would be needed to determine
> exactly the situation you are experiencing.
>
> If you zoom to the layer, is it then displayed in the same place as the
> rest of your map?
>
> My recollection of the georeferencer is it produces a world file to go
> with the layer. This should have the correct top-left coordinates and pixel
> resolution in it. Is there also an XML file that specifies the CRS?
>
> Look at the layer name where it is loaded in the GIS and see if there is a
> question mark displayed next to its name, that indicates QGIS doesn't have
> enough information to position the layer, such as the information that is
> stored in sidecar files.
>
> It is also possible if the file is very large that it will be slow to
> display. Also have a look at the error log at the bottom of the screen to
> see if any error messages are displayed.
> On 17/06/22 04:23, Firstname Lastname via Qgis-user wrote:
>
> i have been successfully using the georeferencer for some time.  i
> referenced several maps and they succesfully georeferenced and  displayed
> for me.
> Then, i was digitizing and i ran the georeference tool and for some
> reason, the new referenced maps do not display.  i have exited and tried to
> georef in a new project and made sure that i have the same CRS for the
> basemap and the georef tool but when i run the referencer, the layer appear
> but the map will not display.  i have tried restarting, clearing the georef
> tool and running again but i get the same result.   Does anyone know what i
> am doing wrong and why my referenced maps will not display?
>
> --
> Byron Veilleux, MSc. P.Geo
> Conjugate Geologic Services Limited
> Calgary, Alberta Canada
> by...@conjugategeo.com
> Cell:4037108414
>
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-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414
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[Qgis-user] digitizing

[Firstname Lastname via Qgis-user]

i have been successfully using the georeferencer for some time.  i
referenced several maps and they succesfully georeferenced and  displayed
for me.
Then, i was digitizing and i ran the georeference tool and for some reason,
the new referenced maps do not display.  i have exited and tried to georef
in a new project and made sure that i have the same CRS for the basemap and
the georef tool but when i run the referencer, the layer appear but the map
will not display.  i have tried restarting, clearing the georef tool and
running again but i get the same result.   Does anyone know what i am doing
wrong and why my referenced maps will not display?

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414
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[Qgis-user] i would like my basemap to display UTM and LAt long grid lines

[Firstname Lastname via Qgis-user]

i am using a NAD 83 UTM grid for my basemap and want to display lat-long
grid on this as well, does anyone know how i can do this in QGIS?

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414
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[Qgis-user] most efficient way to digitize polygons

[Firstname Lastname via Qgis-user]

i am a qgis newby and i am beginning a large project that involves
digitizing several geology maps.  i am trying to determine the best way to
manage the digitizing and avoid extra work.
my question to the group is:  If i have several coloured polygons that are
adjacent to each other, is there an efficient way to digitize one polygon
and then use one edge of that polygon for the adjacent polygon so that i
dont have to redigitize the same edge twice and so that i will have
precisely overrlapping polys with no gaps?  should i digitize one polygon,
export and rename it?  can i digitize one have of the next polygon and
somehow merge it with the now re-imported polygon?
is there a more efficient way to do this?

many thanks

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
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[Qgis-user] georeferencer disappears

[Firstname Lastname]

if i am using the georeferencer and i use another window in an application
(power point or adobe etc), the digitizer window minimizes or disappears.
trying to start the georeferencer again does not bring back the window and
i can not locate it again.  i am forced to shut down and reload QGIS.
not a show stopper, but a little inconvenient.  if someone can let me know
how to get it back without exiting, i would appreciate it, or log it as a
bug.
thanks

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414


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Re: [Qgis-user] loading geologic symbol library

[Firstname Lastname]

hello Bernd etal.  i did not see a solution to this or did i miss it.
thanks for the assistance.


On Thu, Jan 13, 2022 at 10:02 AM Bernd Vogelgesang 
wrote:

> Hey Benoit,
>
> now all is fine :) Can imagine that it's not so easy to keep everything up
> to date .
> E.g. the geological stuff from the Resource Sharing Plugin seems to be
> mainly non-functional as well at the moment ...
>
> Thanx a bunch!
>
> Bernd
>
>
> Am 13.01.22 um 17:36 schrieb info:
>
> Hi Bernd,
>
> Oops! Some files did not upload at all... Please try again to download the
> FGDC folder.
>
> 32 files should be in 700-LithoMetalIgneousVein folder.
>
> Cheers,
> Benoit
>
>
> On 13/01/2022 18:16, Bernd Vogelgesang wrote:
>
> Hi Benoit,
>
> thanx a ton! Now it works. Just, symbols for 703 to 733 are question marks
> again.
>
> Cheers,
>
> Bernd
> Am 13.01.22 um 15:20 schrieb info:
>
> Hi Bernd,
>
> You're right the xml's on the repo do point to non-existent folders.
>
> I've added a FGDC folder to the repo with the correct folder structure.
> Copy that folder (FGDC) into one of QGIS svg path folders and you can then
> use the xml files to import the svg symbols.
>
> Cheers,
> Benoit
>
>
>
> On 13/01/2022 15:04, Bernd Vogelgesang wrote:
>
> Hi Benoit,
>
>
> sorry for the confusion. I specifically refer to your answer and the
> linked project. There is a svg-folder and a folder with the xml-files from
> the download.
>
> Setting the path to the svg-folder and then importing the xml is simply
> not successful.
>
> As you refered to this project, I assumed that you successfully imported
> those styles.
>
> Cheers,
>
> Bernd
>
>
>
> Am 13.01.22 um 13:56 schrieb info:
>
> Hi Bernd,
>
> Thanks for your comments. It seems I've misread Byron's problem and
> assumed that his library is wrapped up into an xml file!
>
> In order to use the solution I've provided you need to have an xml
> "library" file describing the .svg files.
> Then you point *Settings -> Style Manager... -> Import/Export -> Import
> Item(s)...* to the xml file not the svg files.
>
>
> @Byron, open one of your svg files with a text editor. Does the first line
> starts with " standalone="no"?>'?
> If not you probably have downloaded html files embedding svg images!
>
> Cheers,
> Benoit
>
>
> On 13/01/2022 14:32, Bernd Vogelgesang wrote:
>
> Hi Benoit,
>
> I just tried to import the symbols from the page you mentioned which leads
> to this repository: https://github.com/BC-Consulting/FGDC-4-QGIS/
>
> Now, even with all explanations given, the import seems not to work
> properly.
>
> no matter what path I add for the FDGC folder (just the .../FDGC or the
> .../FDGC/svg path) , on import, it says, that
>
> - the symbols are already there and gives the option to overwrite or skip,
>
> This is "normal" behaviour, so just say "overwrite"
>
> - the option to add comma-separted tags (e.g. Geology) does not work, and
> no tag at all is given
>
> - all symbols are just question marks
>
> Are those guidelines just precisely unprecise, or am I just to dumb to
> understand whats asked from me?
>
> Cheers
>
> Bernd
>
>
>
> Am 13.01.22 um 07:56 schrieb info:
>
> Hi Byron,
>
> *Settings -> Style Manager... -> Import/Export -> Import Item(s)...*
>
> See https://www.geoproc.com/be/qgis-fgdc.htm for more info.
>
> Best regards,
> Benoit
>
>
> On 12/01/2022 23:12, Firstname Lastname wrote:
>
> i have download a geologic symbol library from Rod Holcolme, a geology
> prof in australia.  i have set up the path for the files via the
> Options>system>.svg path.
> this seems to have linked to the directory, but i can not figure out how
> to see the files.
> within the directory, there are several files that show up as microsoft
> edge html files with the file types as shown below.
>
> GeoQSymbols/DipDir/001%20Bedding%20(dipdir).svg
>
> Can anyone help me to get these imported.  i can not get them imported .
> thanks for your help
> --
> Byron Veilleux, MSc. P.Geo
> Conjugate Geologic Services Limited
> Calgary, Alberta Canada
> by...@conjugategeo.com
> Cell:4037108414
>
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[Qgis-user] loading geologic symbol library

[Firstname Lastname]

i have download a geologic symbol library from Rod Holcolme, a geology prof
in australia.  i have set up the path for the files via the
Options>system>.svg path.
this seems to have linked to the directory, but i can not figure out how to
see the files.
within the directory, there are several files that show up as microsoft
edge html files with the file types as shown below.

GeoQSymbols/DipDir/001%20Bedding%20(dipdir).svg

Can anyone help me to get these imported.  i can not get them imported .
thanks for your help
-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414
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[Qgis-user] shapefile editing

[Firstname Lastname]

i have imported a shapefile.   When i do so, i would like to edit the line
data.  The file is a simple line file with 3 lines in it.  how do i copy
the file such that it is not linked to the original shapefile so that i
can edit this new line without altering the original file?
After importing the shapefile, i am unable to select the line and toggle
editing.
how does one copy an existing shapefile without it linked to original data
and how can i activate it for editing?

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414


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Re: [Qgis-user] basic contouring and kriging

[Firstname Lastname]

Thanks for the information above, it was very helpful and i now have a
better understanding of the interpolation process.
As a follow up question, i could not find the krigging function in the
processing toolbox, only TIN and IDW.  where do i look for the krigging
interpolation
Also, i understand the construction of delawney triangles and veronoi
diagrams now and how the veronoi cells are constructed.  What i am not
clear on is, once you have completed the interpolation and you have
your delawney triangle boundaries, how does this get translated to at
regular grid.
the triangular mesh is irregular, how does this get referred to a
rectangular grid?  if you have a brief description, that is adequate.


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On Mon, Dec 6, 2021 at 2:51 PM Nicolas Cadieux 
wrote:

> Hi,
>
> Open the Processing toolbox panel, search for 'Krigging'.  You will see
> multiple SAGA modules. If you search for "interpolation", you will find IDW
> AND TIN under Q modules and other methods under the SAGA module. If you
> search for "grid" you will find multiple algorithms under GDAL/Raster
> analysis.  See https://gdal.org/tutorials/gdal_grid_tut.html#gdal-grid-tut
> and https://gdal.org/programs/gdal_grid.html  for other methods. This
> should cover it.
>
> The idea is generally to interpolate a raster surface from points or lines
> containing a z field or a z value (in 3D files).  After, you use
> Raster/Extract/Contour on this new raster layer.  You can also install the
> contour plugin.  That uses a point file only but I don't know the what
> algorithm it uses.
>
> You may find more algorithm using CrimeStat or GeoDa softwares.
>
> Hope this helps.
>
>
> Nicolas
>
>
>
> On 2021-12-06 1:59 p.m., Firstname Lastname wrote:
>
> hello group:
> i want to demonstrate some of the pitfalls of computer contouring methods
> with limited datasets.  i wanted to use a small dataset to demonstrate
> several contouring algorithms.  In particular, linear interpolation,
> inverse weighted, nearest neighbour and kriging.  Are any of these built
> into QGIS?  i do not see any options to control the contouring in the
> plugins for any options other than the default.
> thank you if you can provide any help.
>
> --
> Byron Veilleux, MSc. P.Geo
> Conjugate Geologic Services Limited
> Calgary, Alberta Canada
> by...@conjugategeo.com
> Cell:4037108414
>
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> --
> Nicolas Cadieuxhttps://gitlab.com/njacadieux
>
>
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[Qgis-user] basic contouring and kriging

[Firstname Lastname]

hello group:
i want to demonstrate some of the pitfalls of computer contouring methods
with limited datasets.  i wanted to use a small dataset to demonstrate
several contouring algorithms.  In particular, linear interpolation,
inverse weighted, nearest neighbour and kriging.  Are any of these built
into QGIS?  i do not see any options to control the contouring in the
plugins for any options other than the default.
thank you if you can provide any help.

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414
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[Qgis-user] excel file with lat long

[Firstname Lastname]

i have a file with a four columns,
latitude, longitude, outcrop name, identifier

how do i import an excel file, do i need to convert to a text file and how
do i assign the format in qgis to import as lat long?
thanks


-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414


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[Qgis-user] geology orientation data.

[Firstname Lastname]

does anyone know of a plug in or utility that will allow me to
display geology orientation data?
specifically strike and dip of bedding, but the full suite of orientation
symbols would be nice.
strike and dip
faults, fractures, cleavage overturned bedding etc.
is there a geology library of symbols somewhere by chance?

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414


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[Qgis-user] generating contours from point elevation data

[Firstname Lastname]

 i have imported several elevation model files into qgis.  they come in as
x,y,z, elevation points.  The original files are of the type:  GDBINDEXES,
GDBTABLE FILE, GDBTABLX, and SPX.  can someone help me with a workflow for
gridding and contouring these elevation files so that they look like either
a contoured topo map or density contoured DEM.   i am able to import the
points but need some help with the contouring

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414


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[Qgis-user] two items for help

[Firstname Lastname]

First, in settings, options, digitizing:  i have clicked on 'enable
snapping by default.'  when i am digitizing polygons, the snapping does not
seem to be engaged.   i have set the snapping tolerance to 13 pixels.  does
anyone know why the snapping does not work?  i assume that these are the
correct settings for snapping to polygons.

second.  i have imported several elevation model files into qgis.  they
come in as x,y,z, elevation points.  the original files are of the type:
GDBINDEXES, GDBTABLE FILE, GDBTABLX, and SPX.  can someone help me with a
workflow for gridding and contouring these elevation files so that they
look like either a contoured topo map or density contoured DEM.

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414


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[Qgis-user] i have been digitizing polygons for a few days and QGIS crashed

[Firstname Lastname]

i have saved several times.  this i know to be true because i have been
importing maps and georeferencing several times.  i have saved these maps
as i have been working and the imported maps have saved.  the  problem is
that i have been digitizing polygons for several days and recently qgis
crashed on me.  the polygons disappeared that i have been digitizing but
the geoereferenced maps have been saved.  the polygon layers were all saved
and were  not scratch layers.  can anyone help me to understand why the
polygons did not get saved.
i am certain that i have saved dozens of times using Project/save.
i am reluctant to do any more work if i can not be certain that it is saving
-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414


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[Qgis-user] georeferencing and displaying lat long.

[Firstname Lastname]

i have several maps to georeference that have reference grid in lat/long.
can someone please tell me how to display the coordinate grid in lat long
on the map so that i get some nice grid lines for reference.  actually,
knowing how to post the reference lines in any coordinate system would be
helpful.
-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414
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[Qgis-user] georeferencing

[Firstname Lastname]

i have successfully georreferenced several maps in QGIS.  The
georeferencing tool leaves a black band around the rotated and shifted
image.  is there any way to get rid of this.  also, i would like to clip
some  of these images to get rid of the margin material.  is there a way to
do this in QGIS?

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414


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[Qgis-user] georeferencing maps

[Firstname Lastname]

hello
i am trying to do some basic georeferencing.  i have been using the
georeferencing tool and i have been following the workflow suggested on
youtube files using the georeferencing tool
i have tried three different maps of new and old vintage.  i have tried to
keep it simple with 4 points control points and have used as many as 10
points.  when i apply the georeferencing, my maps are not calibrating.
even the control points end up 400-600 m. of off the true coordinates.  Any
suggestions that might help fix this.
for reference, i used the epsg 3857 CRS
-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414


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