Re: [Qgis-user] Fwd: Your message to Qgis-user awaits moderator approval

[David Strip via Qgis-user]

  
  
On 3/8/2022 11:04 AM, Cory Albrecht via
  Qgis-user wrote:


  
  
  Could a
moderator deal with this, please? It's been sitting for a few
days. I attached some images to explain my problem. Thanks in
advance.


you could always just upload your images to some hosting service
like imgur or a cloud drive (google drive, OneDrive, etc), then put
links in your email. That avoids the need for the moderator to
intervene,
  

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Re: [Qgis-user] Automating creation of county distribution maps

[David Strip via Qgis-user]

  
  
As first step towards building a model as Nicolas has suggested:
I assume you have a layer with the county boundaries. Export this
layer as a CSV file, keeping only the name of each county in the
export step, and don't export the geometry.
Now open this file in your spreadsheet app of choice.
Add a new column for each plant species.
Put a one in that column for each county where the species is
present.
Save the file (still as CSV).

Open the county layer and the new CSV files in Ggis.
Open the properties window for the county layer and click on the
Joins tab.
Click on the "+" to add a new join. Join to the CSV layer, and
select the county names field as the join field for each.

Now your county layer has the plant species column.
To display a single species, open the properties window for the
county layer, select symbology. Set the symbology as rule based. To
color just those counties with species 1, your rule would say
something like Species1 = 1, where Species1 is the field name you
used. Pick a color/transparency of your choice, then set the "all
others" rules to be the background color you want.

That does it for one species. You can then export to tiff or
whatever. Getting it to cycle through all the different species is
for someone else to explain.
  

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Re: [Qgis-user] Browser and Layout side bars now hidden

[David Strip via Qgis-user]

  
  
On 3/13/2022 8:27 AM, Mike Breiding - Morgantown WV via Qgis-user
wrote:
Greetings,
  
  I have somehow made hidden the Browser Layout and side bars and
  now only the canvas is visible.
  
  What must I do to have them visible again?
  


From the main menu bar -
View->Panels (near the bottom of the list)
Then tick the browser and layer checkboxes
  

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Re: [Qgis-user] again: Create Geospatial PDF producing faulty output

[David Strip via Qgis-user]

  
  
On 3/21/2022 9:52 AM, Ken Sanderson via
  Qgis-user wrote:

If TIF
  output is spatial and is working fine, print to that, then use
  gdal to convert that to pdf?
This would result in a pdf that is nothing more than a bitmap. It
would lose the layer structure that a vector pdf can contain.

  

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Re: [Qgis-user] How to specify buffer distance in Metres when Using WGS84 (EPSG:4326) geometry.

[David Strip via Qgis-user]

  
  
On 3/21/2022 1:44 PM, Bernie Connors
  via Qgis-user wrote:

 
        I am using QGIS 3.20.0-Odense and I have a small set of
  points in EPSG 4326, a geographic projection.  I am trying to use
  the Multi Ring Buffer tool and the units for the buffer distance
  is in "degrees" but I want to specify a buffer of 5 metres.  The
  tool doesn't appear to allow me to change the units for the buffer
  distance.  What can I do here?

You have to set your project CRS to a projected coordinate system in
meters. (Strictly speaking it could be in something else like feet
or miles, but you would have to manually convert the meters to the
units of the CRS). 

  

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Re: [Qgis-user] Problem trying to graduate by value (colum)

[David Strip via Qgis-user]

  
  
A lot of folks get bitten by text fields that look like numbers.
What if the attribute table color-coded the columns with different
colors for text vs. numbers? Or had a second row of headers showing
the field type? What would the disadvantage of such an approach? Of
course, the color coding/field type could be optional.

  

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

[David Strip via Qgis-user]

  
  
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.
  

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Re: [Qgis-user] Dimensioning in QGIS

[David Strip via Qgis-user]

  
  
although a CAD drawing may be drawn to some scale, it is common to
explicitly label lengths (distances) using arrows and extension
lines.



I suspect the OP wants to create dimensional arrows labeling
distances between features on the map, eliminating the need to
measure a scaled distance (say on a printed map), then multiplying
by scale factor, which is almost sure to introduce inaccuracy, as
well as inconvenience.

On 6/23/2022 5:23 PM, Greg Troxel via Qgis-user wrote:

  IainS via Qgis-user  writes:


  
Is there a tool for adding dimensions in QGIS. For those who are wondering
what I am talking about, it is common in CAD drafting to add dimensions to
what you have drawn and this is a whole part of a CAD program where you can
format dimensions .etc.

I have been asked to add dimensions to an archaeological hole I am digging
on a QGIS map and I was wondering whether there is a similar dimensioning
tool in QGIS.

  
  Can you explain what you mean without saying "like CAD"?
Distances are or can be in meters, and it is normal to have a scale on
a map.  So I don't know if this is about representing length
conceptually or about labels with lengths, or ?

Perhaps a link to what you have and what the specific complaint is would  help.

  
  
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Re: [Qgis-user] Dimensioning in QGIS

[David Strip via Qgis-user]

  
  
To the extent that anyone is interested in a discussion of adding
CAD-like dimensioning capabilities to Qgis:

In a CAD model dimensional callouts present the user with
information about lengths, angles, radii, and other metric
properties. Dimension call-outs  in a CAD model (probably more
accurately, a CAD drawing derived from a model) are annotations to
the model, they are not model objects per se. In a well-designed
system, the dimension call-out displays the actual metric value of
identified length, radius, angle, etc. The dimension "object" is
tied to the underlying geometric model and will change the presented
value if the underlying object is changed (eg, scaled in size). In
addition, if the underlying object moves with respect to other
objects in the model, the dimension annotations move with it,
maintaining a constant relationship, for example to the edge whose
length we are dimensioning. 

Extending this notion to GIS in general, and Qgis, introduces a bit
of a difficulty in the sense that CAD systems tend to have a fuzzy
boundary between the notion of what in Qgis is the map canvas and
the  a layout. Sketchup, a popular (and free-ish) CAD modeler allows
dimension annotations in what amounts to the canvas, but also has an
adjunct program Layout for drawings, much like a layout in Qgis. 
That said, I would suggest the starting point in Qgis would be an
annotation capability in the canvas, much like the annotations
introduced in 3.22.  When adding a dimension to the canvas, a user
would click on some aspect of a feature, typically a vertex or other
point-like feature, then click on a second, and a line/arrrow would
be added as an annotation, with text indicating length. Things get a
little more complicated trying to dimension the radius of a circle,
as these are represented in different ways depending on the data
format (eg, shapefile vs. geopackage). To match the semantics of CAD
dimensions, the stored representation would be tied to the
properties of the feature, not to the geo-referenced value at the
time the annotation was created so as to allow the dimension to
dynamically respond to changes in the underlying data. 

None of this gets to the question of should this be added? There are
important differences between a CAD model and a map. A CAD system is
used for design, just as the name says. A CAD model generally goes
through a series of revisions over it's lifetime. A map (at least
for me) is generally intended to reflect a physical reality. It may
experience changes as we refine our understanding of the underlying
physical reality, but in general maps tend to reflect data that is
far more static than that in a CAD model. This suggests that perhaps
we really don't need the same sort of dynamic dimensioning
capabilities that a CAD system provides. WIth that in mind, I think
the appropriate starting point for dimensioning in Qgis, if we want
one at all, is to add a "linear dimension" tool to the existing
annotation toolbar. The tool would allow the user to snap a line
between any two vertices (or points) on a layout, and would add a
dimension arrow between the two points, and perhaps extension
lines,  labeled by default with the appropriate distance. Until a
more compelling use case presents itself, I think it would be
sufficient to make the new dimension annotation be statically
geo-referenced. 
  

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Re: [Qgis-user] Dimensioning in QGIS

[David Strip via Qgis-user]

  
  
On 6/25/2022 6:43 PM, Richard Greenwood
  wrote:


  
  
  At the risk of stating the obvious, all of that can be done
with labels in QGIS. A simple line can be annotated with angle
and distance, which are dynamically updated when the line is
modified. QGIS has the ability to move labels relative to the
object being labeled and supports "call outs" aka "leader
lines". Labels are not "model objects", in other words, labels
are saved in the QGIS project, not in the underlying data. 


This is certainly true - it's just a question of how hard it is to
accomplish.
Here's an example - starting with a polygon layer, I want
to dimension two boundaries of my property - 

I claim no particular expertise in this, so here's my process - 
Convert polygon to lines
explode lines
delete lines that I don't want labeled
use the geometry
  generator provided earlier in this thread
tweak half a dozen parameters buried in the geometry generator to
get the styling I want. 

If users are going to want to routinely add dimensions like this, it
would be far preferable to extend the annotations system to include
a linear dimensioning tool that just requires mouse clicks on two
points and a basic styling dialog. 



Please note that I am not particularly advocating for adding
dimension capabilities to Qgis, as I personally have no use case and
don't know whether there is a common enough need to warrant the
effort. However, I do have extensive CAD experience and was trying
to translate the CAD terminology to the GIS folks unfamiliar with
what "dimension" means in the CAD world, as there seemed to be a lot
of questions about the meaning. 


  
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[Qgis-user] saving styles to geopackage

[David Strip via Qgis-user]

  
  
I know that I can style a layer and save the style to a geopackage.
In doing so, I associate the style with the layer, but can retrieve
that style later for use on a different layer.
Is there any way to create a geopackage of "bare" styles - styles
not associated with a particular layer, just a catalog of styles. 
For example, let's say I'm creating a suite of topo maps and I want
the various layers of each map styled consistently. I could fetch
the styles from a geopackage in which the style has been connected
to a particular instance of the the layer type, but it seems it
might be nice to just have a catalog of styles in a geopackage. I
can do this outside the geopackage system by storing qml files in a
directory, which is fine, but a geopackage feels neater. 

  

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Re: [Qgis-user] copy and paste very slow in qgis

[David Strip via Qgis-user]

  
  
On 7/4/2022 9:03 AM, Michael.Dodd via
  Qgis-user wrote:


  I am trying to copy points with their
attributes from one layer to another (actually one geopackage
file to another), the select is quick, couple of mins, bearing
in mind there are 800,000 points but when pasting into the new
empty geopackage file it is extremely slow. Less than 10% of the
points need to be pasted but it was taking 40mins before I
stopped it and I had no idea how much longer it would take.
There was a hint that it may have done about 30,000 in 40mins.
  Is there another way to do this, I have also
tried switching the selection and deleting the other 90% but
this too is very slow and don’t see the end.

Have you tried selecting the features, then Export->Save
Features, ticking Save Only Selected Features?
  

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Re: [Qgis-user] Convert huge shapefile to small size

[David Strip via Qgis-user]

  
  
On 7/28/2022 5:52 AM, krishna Ayyala via Qgis-user wrote:

  
  dbf file itself is 5.1GB. Rest all other files are
less than 500MB. It is the number of records which is huge. It
has about 117,2100 points.
  


Is that 117,200 points or 1,172,100 points? In either case, there's
almost certainly  something wrong with your file, as you have either
50K or 5K bytes per point, which is off by one or more orders of
magnitude.

For comparison, I created a set of 1M random points with 14
attributes inherited from the polygon they lie in. This includes 3
qlongong fields, 9 doubles,  and 3 strings with a total length of 40
chars. I saved this as a shapefile and the total size is ~300M.
  

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Re: [Qgis-user] excessive threads?

[David Strip via Qgis-user]

  
  
On 7/30/2022 6:36 PM, Greg Troxel via
  Qgis-user wrote:


  
I do understand that threads could help parallelization, eitehr using
multiple cores, or just allowing IO in parallel.

chris hermansen  writes:



  Does it seem like you have one thread per layer for reading plus one for
rendering plus one for user  input?


I don't know how many layers I have :-)I can experiment with some
smaller projects.

When I noticed this, I had not tried to use qgis in at least a day.



  

I did a little bit of quick experimentation using Qgis 3.26 (Buenos
Aires) on Windows 10. The number of threads is all over the place.
It does not seem to be tied to the number of layers in the map, at
least in the sense of steady state (ie, let the app sit idle for a
while). Adding layers bumps the thread count, with shapefiles adding
more threads than files in a geopkg. Locally stored geotiffs are
more like a geopkg vector file in terms of threads. But once things
settle down I end up around 20 threads. Interestingly,
Help->About bumped the thread count by 8. Closing a project (not
saving) and then opening a "new" project (no template) bumped
another 8 threads for about 30 seconds, then settled back
down.Launching Qgis peaked at 30 threads, then after about it minute
settles down to 14. I suspect this is dependent on which plug-ins
I'm running. 

Note these numbers are non-deterministic - Help->About on a fresh
start of Qgis with an empty project jumped from 13 threads to 33,
then settled down to 22, which is different from the previous
attempt where there were open layers in the map.

I'll be interested to hear what drives the thread count to > 150
. None of my very limited test involved database connections or
connections to remote data. Those might have something to do with
it. Maybe layer filters? Complex rendering (eg, geometry
generators)?
  

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Re: [Qgis-user] Tectonic plate boundaries

[David Strip via Qgis-user]

  
  
This page
contains a number of shapefile links and some KMZ links as well.

On 8/13/2022 10:37 AM, John Moyle via Qgis-user wrote:

  
  Hi
New to QGIS. I want to plot Victorian submarine telegraph
  cable interruptions under the Atlantic.  I know, what an
  Anorak!!
I have found a brilliant rasterfile of the seabed from
  GEBCO to use as a base layer. I have also collected all the
  data of cable failure, submarine earthquakes and volcanoes and
  am ready to make vector layers of all the data.
But what I can't find is a shapefile of the tectonic plates
  boundaries, just the boundary lines with no shading or text.
  Everything I do find is rejected by QGIS as not being in a
  suitable format.
Help please!
John
  

  
Dr
John Moyle
MB,
  BS, MSc, PhD, CEng, MInstMC, FRCA, FRHistS
Chartered
  Engineer
Physician
  & Anaesthetist (Retired)
Historian
  (Telegraphy & Medical Technology) 
  
  Home
+44(0)1608 665968
  Cell
    +44(0)7836 244584
  
  Amberley
  Cotswold
Close
  Tredington
  Shipston
on Stour
  Warwickshire
  CV36
4NR, UK 
  
  "A
person has nothing to lose if he believes
in God and in the end he turns out to be wrong but
everything to lose if he
wagers that God does not exist and it turns out in
the end that He really
does." - Blaise Pascal (C17th French Scientist &
Mathematician)
  

  

  
  
  
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[Qgis-user] Location of Layout with multiple maps.

[David Strip via Qgis-user]

  
  
It appears that if one creates a layout with multiple map frames in
the layout, then exports to GeoTiff with world file, the world file
will reflect the first map frame added to the layout, regardless of
where the frame is in the item stack (visibility order) or where it
is located on the page. Can this behavior be counted on?

(Obviously it makes no sense to think there could be more than one
location/world file, so that's not the issue). 


  

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[Qgis-user] Problems with raster layer in geopackage

[David Strip via Qgis-user]

  
  
I have a geopackage called GMU5ab. I also have a map project called
GMU5ab, which is stored in that geopackage. With the GMU5ab project
open in QGIS,  I created a hillshade layer, called "Hillshade" in
the layer list. I saved this layer to the geopackage. Unlike a
vector layer which is stored with the legend name, the layer in the
geopackage was stored as GMU5ab and has a raster icon. If I right
click on a vector layer in a geopackage in the browser, I have the
choice of Manage->Rename Layer, but if I right click on the
raster layer, Manage only offers delete.

Is there a way to store the raster layer with the correct name in
the first place using Qgis?
Once stored, is there a way to rename a raster layer in a geopackage
from within Qgis.

QGIS 3.26 on Windows 10

Thanks


  

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Re: [Qgis-user] Polygon next to road search term

[David Strip via Qgis-user]

  
  
Is a polygon "next to a road" because one (or more) edges of the
polygon is exactly coincident with the road line? Or is it within
some distance of the road line? These lead to different solutions,
but unless your data is very precise, asking for the boundary to be
exactly coincident with a road line is not going to be very
robust.Does your road polyline feature have a road width? If so,
does that factor into "next to"?


On 9/13/2022 5:26 PM, Jon via Qgis-user wrote:

  I am trying to figure out if a property that is a polygon is next to a
polyline (road). I am not well versed with QGIS and every search I do
seems to tell me how to map a polygon onto a road or convert polylines
to a polygon. I am not sure what exactly I need to search on to find
some documentation on how to do what I am looking to do.

What should I be searching on to find if a property that has 4 sides
and is a polygon is next to a road? Is what I am trying to find called
something specific and that is why I am not finding?

Thanks for any help,

Jon
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Re: [Qgis-user] Polygon next to road search term

[David Strip via Qgis-user]

  
  
My starting approach would be to take the road layer and buffer that
out by some small distance - say 5 meters. (Note that you have to be
working in a projected coordinate system for the buffer distance to
have useful meaning.) I would then intersect the buffered layer with
the polygon (lot) layer. The resulting intersections will be the
overlaps between the buffered roads and the polygons. The attribute
table will contain a list of all the intersections and each row of
the table will contain the attributes of both the lots and the
roads, so if the lots and roads have attributes with meaningful
names, you will have a list of all lots that intersect roads and the
names of the road it intersects with.

You could also try extract by location from the processing toolbox.
This would give you a layer of the original lots (polygons) that
intersect some road, but won't tell you which road.

On 9/13/2022 10:19 PM, Jon via Qgis-user wrote:

  I would want the polygon to have road access. So you should be able to
access the polygon firectly from a road. Just a corner touching may
work but that would depend on an easement and I am having enough
trouble just trying to figure out what I should be searching on without
throwing that in as well.

So at this point, the polygon should be able to be accessed by the road
line. So possibly 20' of the road line is touching the polygon.

-Original Message-
From: David Strip 
To: j...@destar.net, Qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Polygon next to road search term
Date: Tue, 13 Sep 2022 21:12:01 -0600

  Is a polygon "next to a road" because one (or more) edges of the polygon is exactly coincident with the road line? Or is it within some distance of the road line? These lead to different solutions, but unless your data is very precise, asking for the boundary to be exactly coincident with a road line is not going to be very robust.Does your road polyline feature have a road width? If so, does that factor into "next to"?
 
 
 On 9/13/2022 5:26 PM, Jon via Qgis-user wrote: 

  
I am trying to figure out if a property that is a polygon is next to a
polyline (road). I am not well versed with QGIS and every search I do
seems to tell me how to map a polygon onto a road or convert polylines
to a polygon. I am not sure what exactly I need to search on to find
some documentation on how to do what I am looking to do.

What should I be searching on to find if a property that has 4 sides
and is a polygon is next to a road? Is what I am trying to find called
something specific and that is why I am not finding?

Thanks for any help,

Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

  



  

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Re: [Qgis-user] Problems with raster layer in geopackage

[David Strip via Qgis-user]

  
  
Starting with a tiff hillshade 10,812 x 10,812 8-bit unsigned int, 1
band , then exporting 

geopkg, default settings - 32,136K bytes
geopkg, manually setting TILE_FORMAT = PNG - 80,572K bytes
gtiff, default no compression - 114,287K bytes
gtiff, high compression (DEFLATE, predictor = 2) - 86,816K bytes

The default is still lossy as expected as the issue has not been
resolved, but it is possible to override the defaults by providing
the TILE_FORMAT = PNG options.



On 9/22/2022 10:36 PM, Nicolas Cadieux wrote:

  
  Hi,
  
I would test but it looks like the issue has not been
  fixed.
  
  Nicolas Cadieux
https://gitlab.com/njacadieux
  
  
Le 22 sept. 2022 à 23:36, David
  Strip 
  a écrit :
  

  
  

  
  On 9/22/2022 7:38 PM, Nicolas
Cadieux wrote:
  
  I
would not store raster in a geopackage unless it’s just
a pretty picture.  The default compression for that
format is not lossless.  I would just save as a .tiff. 
  If I use Properties->Export and export to a geopkg and
  add TILE_FORMAT to PNG, do I get a lossless export?
  (I saw this option in issue
40425 that you submitted back in 12/20.)

  

  


  
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Re: [Qgis-user] Fwd: Your message to Qgis-user awaits moderator approval

[David Strip via Qgis-user]

  
  
your best bet is to upload your screenshots to an image server (eg,
Imgur), then inline the images into your email.

On 10/7/2022 11:25 AM, Hugh Kelley via Qgis-user wrote:

  
  
Hi, 


I included a few screenshots in an email to the
  list and as a result it exceeded the acceptable file size. Is
  this something that can be approved or should I resend a
  smaller email? 
  



  

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Re: [Qgis-user] Updating QGIS version

[David Strip via Qgis-user]

  
  
Most Qgis installers for Windows do not do an update in place.
Instead they install an additional version of Qgis. This allows you
to keep running an earlier version of Qgis at the same time as the
newer one. This might be helpful in some cases, but because it's
atypical of most Windows programs, it is confusing the first time
you encounter this. The desktop or taskbar icon for your previous
version remains connected to the old version. You have to create a
new shortcut to access the new version. Once you are satisfied that
the new version hasn't broken any functionality you need, just go
ahead and uninstall the old version and delete any shortcuts you
have created.
Beware that in some cases a newer version of Qgis will write a
project file that is not backwards compatible. If you open an old
project, you will be warned that saving it will render old versions
unable to open it.

On 10/27/2022 2:40 PM, Sebastian Gutwein via Qgis-user wrote:

  
  I find that windows will open the version I
installed but continue to say the previous version when I open
it by searching windows. In  my case it says 3.18 but opens
3.26. Could this be happening to you? 
  
  
  
On Mon, Oct 24, 2022 at 4:40
  PM krishna Ayyala via Qgis-user 
  wrote:


  Hello,
I have QGIS 3.20 version. I was planning on updating to
  the latest version without uninstalling the current
  version. I have downloaded and installed  "OSGeo4W
  Installer" from the following webpage. The QGIS did not
  update to 3.26 version. My QGIS is still 3.20 version. Can
  anyone please help me fix this?

  

  

  

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Re: [Qgis-user] multiple csv file import

[David Strip via Qgis-user]

  
  
You might consider ogr2ogr as an alternative approach. You can run
this from the command line allowing you to use shell scripts to
iterate through all your .csv files. There are also python bindings
for ogr2ogr if you're more comfortable with python than shell
scripts.

On 11/15/2022 9:59 AM, Salvatore Mellino via Qgis-user wrote:
Hello,
  
  
  thank you for your answer. I have many csv (about 100), so I need
  an automatic procedure. Maybe a python script...
  
  
  Il 15/11/2022 16:55, Nicolas Cadieux ha scritto:
  
  Hi,


Yes, you can do that very easily using QGIS.  Layer/add
layer/add delimited text layer.  Then just export the layer in
the format of your choice. You may need to convert the
coordinates in decimal degrees (ex 75 05 30.4 ->
75.0917800 ).


You can do this in Excel using =(A6)+(B6/60)+(C6/3600)+(D6/3600)
A= Deg, B= Min, C=Sec, D= Decimal Sec.  Then export to csv.


Nicolas



On 2022-11-15 10:08 a.m., Salvatore Mellino via Qgis-user wrote:

Hello,
  
  
  I would like to know if it is possible to import multiple csv
  files contained in a folder and to convert them in shapefiles
  (1 for each csv). All csv files are structured as "lat long
  value" separate by space and without any header line.
  
  
  Thank you for your help! Regards,
  
  
  Salvatore
  
  

  



  

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Re: [Qgis-user] multiple csv file import

[David Strip via Qgis-user]

  
  
Starting with v2.1, ogr2ogr supports
  args X_POSSIBLE_NAMES, Y_POSSIBLE_NAMES which are strings with
  allowed wildcards (eg, Lon* ), or you can use field_1, field_2,
  etc to explicitly give the position of lat/lon.
  It's explained on the driver page. 
  This StackExchange
  post shows csv to shapefile conversion and included Windows
  command line syntax for looping over files in a directory.
  
  On 11/15/2022 12:58 PM, Hugh Kelley wrote:


  
David, this was my first thought when i saw this question
  as well.


however, I didn't look for very long but I haven't seen a
  way to tell ogr2ogr to read columns in a csv as the lat/lon
  and write those as points to the shapefile.  I generally write
  a csv to postgres as a non-spatial table and then process the
  lat lon columns with postgis. 



 Are there arguments for ogr2ogr that can do this?
  


  

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Re: [Qgis-user] Offering QGIS installers through Windows store

[David Strip via Qgis-user]

  
  
This is an intriguing idea. In addition to providing a revenue
source, it has potential benefits to certain classes of users.
You've already identified the automatic updating feature, which many
people will no doubt find desirable. Another feature is the
legitimacy of installing from the MS Store. We periodically see
posts from users in a corporate environment who cannot update to
some version or another unless the IT gods have waved their wands
and blessed a particular release. I expect there are middle ground
environments that don't allow random installations, but will allow
installations from the MS app store, as MS does provide at least a
modest vetting of the content. By providing QGIS through the app
store we will simplify access for users in that environment. 


On 11/22/2022 1:19 PM, Anita Graser via Qgis-user wrote:
Hi,
  
  
  With QGIS functionality and user base constantly growing, the
  required
  
  maintenance also keeps increasing.
  
  To keep our project budget sustainable, we (the PSC) are
  considering
  
  investigating the possibility of offering a Windows installers for
  sale
  
  through the Windows store in addition to the free installers from
  qgis.org.
  
  
  This approach would follow the example of projects such as Krita
  
  (https://krita.org/en/download/krita-desktop/).
  
  It would give our users an additional low-threshold way to support
  QGIS.
  
  And - if I understand the Krita offering correctly - users will
  also get
  
  automatic updates when new versions come out which is a nice
  service.
  
  
  Of course, we will keep offering the free installers and using the
  store
  
  would be completely optional.
  
  
  If you have any experience offering software through the store,
  your
  
  insights would be very much appreciated since we are still at the
  early
  
  stages of exploring this option.
  
  
  Regards,
  
  Anita
  
  
  
  --
  
  Anita Graser
  
  Home: http://anitagraser.com
  
  Twitter: @underdarkgisMastodon: @underdark...@fosstodon.org
  
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Re: [Qgis-user] importing GeoPDF

[David Strip via QGIS-User]

  
  
On 1/10/2023 10:01 AM, JOE LEMONNIER
  via QGIS-User wrote:


  Is there a way or a plugin that allows me to import GeoPDF file such as USGS topos into QGIS as vectors? I’m using version 3.22.6 and trying to import with Layer>AddLayer>Add Vector Layer, but it gives a message “ Invalid Data…"
Thanks in advance,

Joe LeMonnier

Using Qgis 3.26 on WIndows 10 I just drag the USGS topo geoPDF onto
the canvas. I get a dialog asking which layers I want. I selected
all and the resulting Layers window shows  a large number of vector
layers plus the satellite image layer.


  
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Re: [Qgis-user] The theory behind topology

[David Strip via QGIS-User]

  
  
If you're asking the more general question about various geometric
algorithms (like intersection, union, inclusion, etc) you might want
to look at a text on computational geometry.
  

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Re: [Qgis-user] Formatting dynamic text

[David Strip via QGIS-User]

  
  

  I am trying to use the dynamic text option  [%item_variables('Map
1')['map_scale']%] in my print layout but I get a scale of 10.7
in my title block. How can I apply a format number to get it to display a
whole number like 10?


I don't know how to do it using dynamic text, but you can get what
you want using this _expression_
[% round(map_get( item_variables('Map 1'),
  'map_scale'),0)%]
  

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Re: [Qgis-user] [EXTERNAL] Re: Geopackage slow on NAS if not read-only

[David Strip via QGIS-User]

  
  
On 3/18/2023 1:50 PM, Patrick Dunford
  via QGIS-User wrote:

but I
  use NFS, which is not available on Windows (my computers run
  Linux)

NFS is available on Win 10 and 11 in the Pro and Enterprise
versions, but not the Home version.
I think it is not on by default, however.
  

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Re: [Qgis-user] Issue with QgsLayerTreeNode.itemVisibilityChecked

[David Strip via QGIS-User]

  
  
On 5/22/2023 7:44 PM, Patrick Dunford
  via QGIS-User wrote:


  extentGroup = root.findGroup(extentGroupName)
  
  extentLayers = extentGroup.children()
  
  for extentLayer in extentLayers:
  
      if extentLayer.itemVisibilityChecked:
  
          print (extentLayer.name())


shouldn't that be 
 if extentLayer.itemVisibilityChecked():   
(note the addition of parens after the method name).
  

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Re: [Qgis-user] QGIS controlling access in QGIS

[David Strip via QGIS-User]

  
  
Expanding on what Chris said - 
Qgis does not own or manage data, Qgis manipulates and displays data
from files, databases, and web services. As Chris points out, access
to files is controlled through OS settings, databases by database
settings. Web services may require authentication for access. When
Qgis is used to create derivative datasets, these will be stored in
a file system or database, again subject to the sorts of access
restrictions that these systems provide. 

On 5/30/2023 9:59 AM, chris hermansen via QGIS-User wrote:

  
  
Simon and list,
  
  
On Tue, May 30, 2023,
  08:48 Simon via QGIS-User 
  wrote:


  
Hello, 


It's
  me again, I just had some questions regarding the
  ability to control access in QGIS. First of all, is it
  even possible? Can an organization (like departments
  of the Canadian government) control who has access to
  which database or file? Can the IT department of that
  organization manage the access?
  

  



Access to files is controlled through operating
  system settings. Access to databases is controlled by database
  settings. Normally in organizations system administrators
  manage these settings.


Whatever software application is run is limited
  in its access by those settings. It would be unusual for an
  end user software application to further manage access.


Settings typically include ability to read,
  ability to write, ability create and ability delete. So for
  example a set of shape files could be shared as read only to
  users, to a group of users, or via access control lists.


To your point - access to resources is not
  controlled through QGIS; it is controlled by the operating
  system, and by the database server if one is used.

  

  


  

  

  
  
  
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Re: [Qgis-user] Problems with QGIS 3.28

[David Strip via QGIS-User]

  
  
On 7/11/2023 11:41 AM, John Studley via
  QGIS-User wrote:


  Please can someone help
  
  
  QGIS 3.32 will not install on my Windows 10 - I am told that
various files are missing
  QGIS 3.28 will install but the layer box is too big so I
cannot change the polygon colour rendering
  QGIS 2.12 will install but I cannot add plugins but I can
change polygon colours
  
  
  Today I wanted to publish a map on the QGIS cloud so I had to
  1) edit polygon colours in 2.12
  2) Uninstall 2.12
  3) Install 3.28 
  4) Add the requisite plugins
  5) Publish map in cloud
  
  
  There has to be a better way


We need to know which installer you're using to help and at least a
partial list of the missing files.
If you install using the OS4Geo network installer, you can have
multiple versions installed at the same time, so you would not need
to uninstall 2.12 before installing 3.28.

  

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[Qgis-user] Problem saving project to geopkg

[David Strip via QGIS-User]

  
  
I created a geopkg by exporting a layer from my project to a new
geopkg. I then exported a couple of other layers to the geopkg. I
then did File->Save To-> geopkg and saved my project to the
geopkg. So far, so good. Now I made some changes to the project and
tried to save it and now I get a python error 
ValueError:
Cannot open
geopackage:C:/Users/David/Documents/Geodata/Maps/RIP_Medical_Debt.gpkg?projectName=MedicalDebt.mldata
  
How do I fix this?
Thanks



  

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Re: [Qgis-user] Problem saving project to geopkg

[David Strip via QGIS-User]

  
  
On 7/25/2023 11:55 PM, Michael Dufty
  wrote:


  The
  error message includes MedicalDebt.mldata as a project name. 
  I believe this is the file the memorylayer saver plugin
  creates to save the temporary layers to.   Have you tried it
  with that plugin disabled?  
   
  I'm
  really dependent on the memory layer saver plugin, and have
  abandoned investigation of saving files to geopackage because
  memorylayer saver does not seem to support it.


the problem appears not to be the presence of the memory layer
plug-in specifically, but the combination of the plug-in and a
memory layer in the project. If I have a memory layer open in the
project when I try to save to a geopkg, I get the error. If I remove
the memory layers (or save them to the geopkg and replace the memory
layers with the saved layers), then the problem disappears. 
  

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Re: [Qgis-user] Pro tips for beginners

[David Strip via QGIS-User]

  
  
Another "pro" tip (from a non-pro) - 
  Create keyboard shortcuts for frequently used commands, such as
  this one suggested by Michael Duffy - 
  

-Copy and paste styles
between layers.


  

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Re: [Qgis-user] Convert PNG file to vector file

[David Strip via QGIS-User]

  
  
On 10/25/2023 7:46 AM, krishna Ayyala via QGIS-User wrote:

  
  
Thanks for the reply Simon. The
Polygonize tool did not work for me.

  
Regards.

  

It's not surprising that polygonize didn't work. Polygonize
recognizes regions of constant color. The patterned fills of the
regions in your file will completely defeat polygonize. The fact
that regions overlap only further complicates the matter. You will
either have to manually digitize the image or find someone who has
the files that were used to generate the map.
  

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Re: [Qgis-user] Hillshade default direction

[David Strip via QGIS-User]

  
  
Thank you to both of you for your informative responses. 
This prompted me to look at some satellite imagery and while the
plateau vs. valley effect is not as distinct, the reversal of hills
persists. Never noticed that before.
  

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Re: [Qgis-user] How to create 3d terrain from DEM?

[David Strip via QGIS-User]

  
  
In addition to the advice you've already gotten, the reason your 3D
model is so "wonky" is that you don't have elevation data outside
the region you plotted, so these all have elevation zero.  Since the
region is around 8500' elevation, that creates the vast wall effect
you're seeing. 
More fundamentally, however, is that you are taking an unnecessarily
difficult path to creating this model. You can download a 1/9
arc-second DEM from the National Map
which gives you a highly accurate elevation model for the entire
region, eliminating the problem you're having. 
Contact me off the mailing list if you want more help.
 
  

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Re: [Qgis-user] Announce - migrate our mailing lists to Discourse

[David Strip via QGIS-User]

  
  
I've never used Discourse so I'm not in a position to compare it's
usefulness to the existing email format. I can add one more voice
expressing satisfaction with the email approach and how it
encourages readers to view everything rather than narrowing focus to
topics of interest. It also strikes me that we will inevitably lose
some people in the transition because of the friction required to
move focus to a new format, regardless of whether you like or hate
Discourse.
  

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Re: [Qgis-user] Moving many project files - bulk updating paths to tables?

[David Strip via QGIS-User]

  
  
On 4/5/2024 2:15 AM, Antonio Viscomi
  via QGIS-User wrote:


  if you're using linux what you need is simply use the 'sed'
command by terminal as i.e.:
  
  
  sudo sed -i 's/NEWPATHTOSUBSTITUTE(your path or IP or
  domain)/OLDPATH/g' *.qgs


The original request noted that the files were .qgz files, not .qgs,
so you need to first unzip, the rezip the files.
And this single line solution assumes all files are in a single
directory, so you need something "find" to walk the directory
structure.
  

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Re: [Qgis-user] [QGIS-Developer] Announce - migrate our mailing lists to Discourse

[David Strip via QGIS-User]

  
  
On 4/10/2024 9:00 AM, Régis Haubourg
  via QGIS-User wrote:

I also
  heard yesterday another argument, given that we have
  StackExchange, mailing list and forums would be of no use.  Except
  you don't discuss on StackExchange, you only ask questions. And we
  don't own the content (side remark) there.  

Stack Exchange is not a good substitute. A number of the most active
users are quick to close any post with more than one question, often
making it hard to coherently post about your issue.
  

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Re: [Qgis-user] GIS Institutes - Online Courses

[David Strip via QGIS-User]

  
  
On 4/13/2024 12:45 PM, krishna Ayyala
  via QGIS-User wrote:

I
  wish to enroll in some of the online GIS courses. Is there a place
  or weblink where can I get the complete list of GIS Institutes
  that offer online courses? I am looking for institutes that are
  located in the USA, Canada and Europe.

Coursera has quite a few from a range of US and Canadian
universities. Many are free, though you must pay if you want a
formal credential or credit.
  

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