Re: [Qgis-user] Georeferencing images

[Jorge Gustavo Rocha]

Hi,

I use OpenDroneMap [1] for that. Using ODM you get the orthophotomap and
several other useful things (like the DEM).

Regards,

Jorge

[1] https://www.opendronemap.org/

On 10/07/20 15:29, blubee blubeeme wrote:
> Id like to thank the few users who helped me with my previous question.
>
> It seems like georeferencing will me more work than I initially
> anticipated. 
>
> Can anyone give me a quick overview of a pipeline to go from uav
> images with embedded GPS coordinates to a series of stitched maps. 
>
> The area that I'm working on lacks features since it's all mountains
> with trails that aren't visible from above. 
>
> I could go into certain flat areas and use Garmin device to place
> makers, that's the most accurate method that I could use to place makers. 
>
> Any tips would be greatly appreciated. 
>
> Best
>
> ___
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> Qgis-user@lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
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Re: [Qgis-user] Georeferencing images

[Saber Razmjooei]

Hi

In the past, we developed a private plugin for georeferencing and
stitching multiple UAV images, similar to ENVI software workflow.

If you are dealing with an area where the elevation changes significantly,
best to follow the discussion here:
https://github.com/qgis/QGIS/pull/36385

As my colleague, Martin suggested, we may need to improve the current
Georeferencer plugin to make use of RPC_DEM.

Kind regards
Saber

On Fri, 10 Jul 2020 at 15:41, Nicolas Cadieux 
wrote:

> Hi,
>
> If the images have embedded GPS coordinates, all you need to do is drag
> and drop the rasters in QGIS.  If you have coordinates but no CRS, you may
> need to indicate the which Coordinates Reference System to use (Probably
> WGS84) depending on your settings.  You can install a plugin like quickmap
> and load a background image.  That will help you figure out if the image
> are georeferenced correctly.  Look at your coordinates in the lower right
> corner.  You can use that to figure out if you are in meters or in degrees.
>
> Nicolas Cadieux
> Ça va bien aller!
>
> > Le 10 juill. 2020 à 10:22, blubee blubeeme  a
> écrit :
> >
> > 
> > Id like to thank the few users who helped me with my previous question.
> >
> > It seems like georeferencing will me more work than I initially
> anticipated.
> >
> > Can anyone give me a quick overview of a pipeline to go from uav images
> with embedded GPS coordinates to a series of stitched maps.
> >
> > The area that I'm working on lacks features since it's all mountains
> with trails that aren't visible from above.
> >
> > I could go into certain flat areas and use Garmin device to place
> makers, that's the most accurate method that I could use to place makers.
> >
> > Any tips would be greatly appreciated.
> >
> > Best
> > ___
> > Qgis-user mailing list
> > Qgis-user@lists.osgeo.org
> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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-- 
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www.lutraconsulting.co.uk
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Re: [Qgis-user] null geometries workaround

[Tudorache, Marian]

I fix the null geometries programmatically.
For example:
geom = feature.geometry()
if type(geom) == types.NoneType:
   like skip or delete.

To delete these geometries you can use this algorithm
featuresToDelete = []
for feature in layer.getFeatures():
  geom = feature.geometry()
  if type(geom) == types.NoneType:
 featuresToDelete.append(feature.id())

if len(featuresToDelete) > 0:
  layer.startEditing()
  layer.setSelectedFeatures(featuresIds)
  layer.deleteSelectedFeatures()
  layer.commitChanges()

to delete you also can used 
layer.dataProvider().deleteFeatures(featuresToDelete)

I hope this will help.
Thanks,
Marian



From: Qgis-user  On Behalf Of Jésahel Benoist
Sent: Thursday, July 2, 2020 10:09 AM
To: qgis-user ML 
Subject: [EXT] [Qgis-user] null geometries workaround

I had to deal with null geometries (points) in a geopackage. As it shows some 
QGIS strange behavior I decided to post this.

When the attributes table is by default on "filtered by view", switching to 
"show all" is filtering null geometries. No way to show them... By changing the 
default behaviour in the options to "show all", there's no more filter, but it 
isn't possible to find faulty lines ; all graphic tools are working as if 
everything was correct.

I've found that the "geometry attribute table" plugin by P. Whitten can help, 
however, I wondered if there was a standard tool to do the job.

With QGIS 3.10.7, the 'removenullgeometries', 'fixgeometries', 
'checkgeometries' processing tools doesn't work.
The checkgeometry tool finds them, but gives only the id without any option to 
fix.

I found with "DB browser with SQLite" that the geometry was there, but x and y 
were 0x   f87f. This is for 'not a number' (nan) value. But I 
didn't find any expression to check for this value...

Finally, I found two ways to find the faulty lines :
The first is to create a calculated field with $x as value. (nan) is clearly 
shown then.
The second is to make a filter with this simple formulae : if (to_int($x)=0, 
true, false). The to_int() converts the nan value to 0, et voila. Easy.

You're then free to add a part or delete the faulty lines.

Hope it helps some people...

Jésahel





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Re: [Qgis-user] Georeferencing images

[Nicolas Cadieux]

Hi,

If the images have embedded GPS coordinates, all you need to do is drag and 
drop the rasters in QGIS.  If you have coordinates but no CRS, you may need to 
indicate the which Coordinates Reference System to use (Probably WGS84) 
depending on your settings.  You can install a plugin like quickmap and load a 
background image.  That will help you figure out if the image are georeferenced 
correctly.  Look at your coordinates in the lower right corner.  You can use 
that to figure out if you are in meters or in degrees.

Nicolas Cadieux
Ça va bien aller!

> Le 10 juill. 2020 à 10:22, blubee blubeeme  a écrit :
> 
> 
> Id like to thank the few users who helped me with my previous question.
> 
> It seems like georeferencing will me more work than I initially anticipated. 
> 
> Can anyone give me a quick overview of a pipeline to go from uav images with 
> embedded GPS coordinates to a series of stitched maps. 
> 
> The area that I'm working on lacks features since it's all mountains with 
> trails that aren't visible from above. 
> 
> I could go into certain flat areas and use Garmin device to place makers, 
> that's the most accurate method that I could use to place makers. 
> 
> Any tips would be greatly appreciated. 
> 
> Best
> ___
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> Qgis-user@lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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[Qgis-user] Georeferencing images

[blubee blubeeme]

Id like to thank the few users who helped me with my previous question.

It seems like georeferencing will me more work than I initially
anticipated.

Can anyone give me a quick overview of a pipeline to go from uav images
with embedded GPS coordinates to a series of stitched maps.

The area that I'm working on lacks features since it's all mountains with
trails that aren't visible from above.

I could go into certain flat areas and use Garmin device to place makers,
that's the most accurate method that I could use to place makers.

Any tips would be greatly appreciated.

Best
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Re: [Qgis-user] New Apple Macintosh ARM Chipsets

[Andreas Neumann]

Hi Michael, 


Or you could buy a used Intel Mac that is only 1-3 years old. I would
assume that many Apple afficionados are eager to jump to new hardware
and would give away the old Intel stuff for a bargain. If QGIS is
important to you, that might be a better deal than becoming an early
adopter of arm hardware and suffer from all the early problems. Over the
years - after all the major problems are solved, I would agree that a
more energy efficient processor sounds compelling. 


About documentation: documenter are always welcome. The introduction can
be found at https://www.qgis.org/en/site/getinvolved/document.html -
there is a dedicated mailing list for documenters and you need a github
account. 

Thanks in advance for your efforts in joining the documentation team! 

Greetings, 

Andreas 


On 2020-07-10 15:51, Michael Goldstein wrote:


Thanks to everyone who responded to my email.

I'm currently running a 27" late-2013 iMac, whose life I extended by upgrading 
the boot drive to SSD.  While it's still a capable machine, I don't think it has 2+ 
more years left in it.  Sigh.  So I may be forced to make the ARM transition sooner 
rather than later, unless I decide to upgrade to an Intel iMac instead (which is not 
so desirable given my other commitments to the Apple eco-system)..

I've been running QGIS on Macs since 1.x.  Over the years Mac support has been 
spotty even into the 3.xx era.  For example, a few months ago I had to run the 
Windows version in a VM to export a georeferenced PDF. That was a python issue, 
I think... QGIS 3.8 needed a later version of phython which didn't then exist 
for Mac.  That said, a sincere thanks to kyngchaos making it possible to run on 
Mac at all for many of those years!

Good news that the port to ARM should be straight-forward.  I do hope it 
becomes a priority because the inherent energy efficiency of the ARM chipsets 
should make for some compelling hardware, particularly for laptop users.

Finally, I would like to volunteer to write some documentation.  What's the 
best way to do that?

Michael

qgis-user-requ...@lists.osgeo.org wrote on 7/10/20 2:33 AM: Send Qgis-user 
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qgis-user@lists.osgeo.org

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Today's Topics:

1. export a composite image to kmz format (carlos h)
2. Re: New Apple Macintosh ARM Chipsets
(Priv.-Doz. Dr. Maria Shinoto)
3. Re: export a composite image to kmz format (Nicolas Cadieux)
4. Re: Closest Distance of a point within a polygon to the
closest part of that polygon and the name of the adjacentpolygon
with the common boarder (David Kabay)
5. Re: New Apple Macintosh ARM Chipsets (Saber Razmjooei)
6. Re: New Apple Macintosh ARM Chipsets (Andreas Neumann)

--

Message: 1
Date: Thu, 9 Jul 2020 17:07:14 -0600
From: carlos h 
To: qgis-user 
Subject: [Qgis-user] export a composite image to kmz format
Message-ID:

Content-Type: text/plain; charset="utf-8"

Hello! I am with QGis version 3.10.x.

How can I export a composite image to kmz format?

Thank you
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Message: 2
Date: Thu, 9 Jul 2020 23:34:00 +
From: "Priv.-Doz. Dr. Maria Shinoto"

To: Michael Goldstein 
Cc: "qgis-user@lists.osgeo.org" 
Subject: Re: [Qgis-user] New Apple Macintosh ARM Chipsets
Message-ID:
<1b8a9ddb-c742-4b5a-a674-19bb1661a...@zaw.uni-heidelberg.de>
Content-Type: text/plain; charset="us-ascii"

Hi,

earlier posts said that a port to ARM architecture should not be too big of a 
problem.

I do not remember the details, but my conclusion was: Just wait, no problems to 
expect.

But I have to admit that I own a MacBook Pro from 2019 and do not plan to 
change in the next five or more years. I would hesitate to buy ARM architecture 
in the next 12 months anyway.

Best,
Maria

Am 09.07.2020 um 22:57 schrieb Michael Goldstein :

I've just joined this email list, so if this has been covered earlier, I 
apologize.  Also, let me know if I should be directing this question to a 
different mailing list (Developer list?).

Do plans exist to port QGIS to the new Apple Mac ARM architecture?

While I am not technical enough to help with the coding/re-compiling, I am a 
good documentation writer and would be happy to help document a new Mac 
release.  How should I volunteer?

Michael
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Re: [Qgis-user] New Apple Macintosh ARM Chipsets

[Michael Goldstein]

Thanks to everyone who responded to my email.

I'm currently running a 27" late-2013 iMac, whose life I extended by 
upgrading the boot drive to SSD.  While it's still a capable machine, I 
don't think it has 2+ more years left in it.  Sigh.  So I may be forced 
to make the ARM transition sooner rather than later, unless I decide to 
upgrade to an Intel iMac instead (which is not so desirable given my 
other commitments to the Apple eco-system)..


I've been running QGIS on Macs since 1.x.  Over the years Mac support 
has been spotty even into the 3.xx era.  For example, a few months ago I 
had to run the Windows version in a VM to export a georeferenced PDF. 
That was a python issue, I think... QGIS 3.8 needed a later version of 
phython which didn't then exist for Mac.  That said, a sincere thanks to 
kyngchaos making it possible to run on Mac at all for many of those years!


Good news that the port to ARM should be straight-forward.  I do hope it 
becomes a priority because the inherent energy efficiency of the ARM 
chipsets should make for some compelling hardware, particularly for 
laptop users.


Finally, I would like to volunteer to write some documentation.  What's 
the best way to do that?


Michael



qgis-user-requ...@lists.osgeo.org wrote on 7/10/20 2:33 AM:

Send Qgis-user mailing list submissions to
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To subscribe or unsubscribe via the World Wide Web, visit
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or, via email, send a message with subject or body 'help' to
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of Qgis-user digest..."


Today's Topics:

1. export a composite image to kmz format (carlos h)
2. Re: New Apple Macintosh ARM Chipsets
   (Priv.-Doz. Dr. Maria Shinoto)
3. Re: export a composite image to kmz format (Nicolas Cadieux)
4. Re: Closest Distance of a point within a polygon to the
   closest part of that polygon and the name of the adjacentpolygon
   with the common boarder (David Kabay)
5. Re: New Apple Macintosh ARM Chipsets (Saber Razmjooei)
6. Re: New Apple Macintosh ARM Chipsets (Andreas Neumann)


--

Message: 1
Date: Thu, 9 Jul 2020 17:07:14 -0600
From: carlos h 
To: qgis-user 
Subject: [Qgis-user] export a composite image to kmz format
Message-ID:

Content-Type: text/plain; charset="utf-8"

Hello! I am with QGis version 3.10.x.

How can I export a composite image to kmz format?

Thank you
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Message: 2
Date: Thu, 9 Jul 2020 23:34:00 +
From: "Priv.-Doz. Dr. Maria Shinoto"

To: Michael Goldstein 
Cc: "qgis-user@lists.osgeo.org" 
Subject: Re: [Qgis-user] New Apple Macintosh ARM Chipsets
Message-ID:
<1b8a9ddb-c742-4b5a-a674-19bb1661a...@zaw.uni-heidelberg.de>
Content-Type: text/plain; charset="us-ascii"

Hi,

earlier posts said that a port to ARM architecture should not be too big of a 
problem.

I do not remember the details, but my conclusion was: Just wait, no problems to 
expect.

But I have to admit that I own a MacBook Pro from 2019 and do not plan to 
change in the next five or more years. I would hesitate to buy ARM architecture 
in the next 12 months anyway.

Best,
Maria


Am 09.07.2020 um 22:57 schrieb Michael Goldstein :


I've just joined this email list, so if this has been covered earlier, I 
apologize.  Also, let me know if I should be directing this question to a 
different mailing list (Developer list?).

Do plans exist to port QGIS to the new Apple Mac ARM architecture?

While I am not technical enough to help with the coding/re-compiling, I am a 
good documentation writer and would be happy to help document a new Mac 
release.  How should I volunteer?

Michael
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Message: 3
Date: Thu, 9 Jul 2020 20:08:15 -0400
From: Nicolas Cadieux 
To: carlos h 
Cc: qgis-user 
Subject: Re: [Qgis-user] export a composite image to kmz format
Message-ID: <2ee34401-012d-46de-9234-0bb0f55c2...@gmail.com>
Content-Type: text/plain; charset="utf-8"

Hi,
I believe only Vector layers are supported. Kmz is a zipped kml.
Nicolas


https://gdal.org/drivers/vector/kml.html

Keyhole Markup Language (KML) is an XML-based language for managing the display 
of 3D geospatial data. KML has been accepted as an OGC standard, and is 
supported in one way or another on the major GeoB

Re: [Qgis-user] Newbie Question regarding Attribute Tables

[Áron Gergely]

Hi Wanda,

Welcome to the QGIS community!

Ctrl+F is the shortcut for 'Filter' in the attribute table.

Apparently when you hit this shortcut, the attribute window switches 
into  'form view'.
No worries, you jsut need to press a button on the lower right to return 
to attribute view.


You can toggle between attribute / table view by clicking on their 
buttons in the lower right of the attribute window:





You can read more about form view / table view in the QGIS docs:
https://docs.qgis.org/3.10/en/docs/user_manual/working_with_vector/attribute_table.html#table-view-vs-form-view

Good luck!
Aron


On 10/07/2020 14:57, Wanda Norman wrote:
I have minimal GIS experience (took 2 classes 10 years ago).  My new 
job is requiring me to brush up on it and we use QGIS software.  I 
have been watching and learning from some of the online tutorials.  
However, I did something and I don't know how to undo it...


While working in an attribute table I hit Control F and it changed to 
this view:


image.png

I tried unloading and reloading the software - hoping it would reset - 
but alas... it did not.


Can you please tell me how to get the table that looks like Excel back??

Thank you!


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Re: [Qgis-user] Closest Distance of a point within a polygon to the closest part of that polygon and the name of the adjacent polygon with the common boarder

[Reginald]

Hi,

Yes the easiest way is to densify your polygons. With the desify algo you
can do this and specify how dense you want them to be.
processing.run("native:densifygeometries",
{'INPUT':'C:\\Users\\reginaldc\\Documents\\testdensify.gpkg|layername=testdensify','VERTICES':1000,'OUTPUT':'TEMPORARY_OUTPUT'})
Next you can create a line from your polygon. This line will contain the
same amount of vertexes as your polygon.
processing.run("native:polygonstolines",
{'INPUT':'memory://Polygon?crs=EPSG:31370&field=fid:long(0,0)&uid={8ed5e288-ec55-4630-aaf8-8f26a1e1c5cc}','OUTPUT':'TEMPORARY_OUTPUT'})
Next you create points from your line.
processing.run("native:extractvertices",
{'INPUT':'memory://MultiLineString?crs=EPSG:31370&field=fid:long(0,0)&uid={1b672349-4d50-44b6-b4b4-98bb6218d3ce}','OUTPUT':'TEMPORARY_OUTPUT'})
Then you look for the distance of the closest vertex
processing.run("qgis:distancetonearesthubpoints",
{'INPUT':'C:\\Users\\reginaldc\\Documents\\testdensify.gpkg|layername=testpunten','HUBS':'memory://Point?crs=EPSG:31370&field=fid:long(0,0)&field=vertex_index:integer(10,0)&field=vertex_part:integer(10,0)&field=vertex_part_index:integer(10,0)&field=distance:double(20,14)&field=angle:double(20,14)&uid={629995db-9019-47f2-9c4b-72523ff6fc9e}','FIELD':'vertex_index','UNIT':0,'OUTPUT':'TEMPORARY_OUTPUT'})
Finally you make a buffer a little bit greater than this distance in the
direction of the closest vertex (angle is also in the attribute table.

Regards,




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Re: [Qgis-user] Newbie Question regarding Attribute Tables

[Werner Macho]

Hi!

Try the rightmost button at the bottom of that window (the button left
beside the rightmost is the one creating the view you currently have)

regards
Werner

On Fri, Jul 10, 2020 at 2:52 PM Wanda Norman
 wrote:
>
> I have minimal GIS experience (took 2 classes 10 years ago).  My new job is 
> requiring me to brush up on it and we use QGIS software.  I have been 
> watching and learning from some of the online tutorials.  However, I did 
> something and I don't know how to undo it...
>
> While working in an attribute table I hit Control F and it changed to this 
> view:
>
>
>
> I tried unloading and reloading the software - hoping it would reset - but 
> alas... it did not.
>
> Can you please tell me how to get the table that looks like Excel back??
>
> Thank you!
>
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[Qgis-user] Newbie Question regarding Attribute Tables

[Wanda Norman]

I have minimal GIS experience (took 2 classes 10 years ago).  My new job is
requiring me to brush up on it and we use QGIS software.  I have been
watching and learning from some of the online tutorials.  However, I did
something and I don't know how to undo it...

While working in an attribute table I hit Control F and it changed to this
view:

[image: image.png]

I tried unloading and reloading the software - hoping it would reset - but
alas... it did not.

Can you please tell me how to get the table that looks like Excel back??

Thank you!
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[Qgis-user] Plugin development: how to handle API break

[Yann Voté]

Hi list,

I wrote the experimental CSV Tools plugin which depends on the 
processing.tools.postgis Python module.


Now with QGIS 3.14, this module does not exists anymore since classes 
`QgsProcessingParameterDatabaseSchema` and 
`QgsProcessingParameterDatabaseTable` have been introduced (but maybe it 
should have been kept for backward compatibility ?).


How do I properly manage this situation ? I want both QGIS 3.12 and 
older and QGIS 3.14+ to be able to install the plugin ? Do I create a 
new separate plugin for QGIS 3.14+ and maintain both plugins until the 
next LTR ?


For now I have set QgisMaximumVersion to 3.12 in metadata.

Thanks.

--
Yann Voté - ygver...@lilo.org
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Re: [Qgis-user] Plugin development: how to handle API break

[Yann Voté]

My bad, didn't see before that it is possible to check QGIS version in 
PyQGIS. That's the way to go...


Le 10/07/2020 à 14:11, Yann Voté a écrit :

Hi list,

I wrote the experimental CSV Tools plugin which depends on the 
processing.tools.postgis Python module.


Now with QGIS 3.14, this module does not exists anymore since classes 
`QgsProcessingParameterDatabaseSchema` and 
`QgsProcessingParameterDatabaseTable` have been introduced (but maybe it 
should have been kept for backward compatibility ?).


How do I properly manage this situation ? I want both QGIS 3.12 and 
older and QGIS 3.14+ to be able to install the plugin ? Do I create a 
new separate plugin for QGIS 3.14+ and maintain both plugins until the 
next LTR ?


For now I have set QgisMaximumVersion to 3.12 in metadata.

Thanks.



--
Yann Voté - ygver...@lilo.org
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[Qgis-user] plugins.qgis.org Upgrades complete

[Tim Sutton]

Dear users, developers and PSC

We have completed the updates to the QGIS Plugin Repository. Thank you for your 
patience while the service was offline during the upgrade. If you encounter any 
issues with the server / service subsequent to this upgrade, please file an 
issue in the QGIS-Django issue tracker:

https://github.com/qgis/QGIS-Django/issues 


Regards

Tim, Dimas and Ludovic

 




---

Tim Sutton
t...@qgis.org




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Re: [Qgis-user] Closest Distance of a point within a polygon to the closest part of that polygon and the name of the adjacent polygon with the common boarder

[Christoph Jung]

Hello Dave,

With the plugin “Closest Points” you can calculate the closest points on your 
polygons for each point. The distance and the IDs of the input point and the 
closest polygon will also be stored in the result layer to create joins between 
the result layer and your input data. 

Sincerely,
Christoph

> Am 10.07.2020 um 06:18 schrieb David Kabay :
> 
> 
>  
>  
>  
>  
> Hi
>  
> I have a challenge.  I have 2 vector data sets.  One is point vectors 
> (Occurrence of a soil fungus  Pc at a point  +red  with a year of sampling as 
> a label)  and polygon vectors that show the various surface geologies in an 
> area ( the name is on the boundary (purple)  Inside of the one it is  e.g. 
> S10, S8 Mc1 etc. 
>  
>  
> QGIS can give me the number of Pc sample points in each polygon which I have 
> done.  I want to be able to get the distance from the point to the NEAREST 
> boundary and the other name of the surface geology of the closest adjoining 
> polygon I want it for all Pc points
> How do I do that in QGIS ??
>  
>  
>  
>  
>  
>  
> Thanks Dave
>  
> Dave Kabay
> 19A Priestley Street
> Embleton WA  6062
>  Phone 08 6142 6756  Mob 0417 950 508
>  
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