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Questions tagged [qgis]

QGIS is a cross-platform GIS application licensed under the GNU General Public License.

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QGIS 3.xx Mac Version installation clarification - What gets installed from single dmg file?

Can someone please clarify what is installed exactly when I download the Mac versions of QQIS from the QGIS.org homepage? The .dmg file gets downloaded and I can drag the application to the ...
keeneh's user avatar
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0 answers
7 views

How to convert patch ID output file from FRAGSTATS into vector file with QGIS

I am trying to convert a patch ID file (raster) which i generated using FRAGSTATS into a vector file in order to perform a table join between this vector file and the .patch file that contains the ...
AlFelix's user avatar
2 votes
1 answer
13 views

Select unsymbolised features in QGIS

In QGIS 3.34.5, I am symbolising a large area of point features extracted from OpenStreetMap. I currently have an ELSE clause that shows me the features that have not yet been symbolised in a large ...
Tom Brennan's user avatar
  • 5,269
2 votes
1 answer
22 views

Get signal on layer scale based visibility changed in PyQGIS

Is it possible, to get a signal, when something (user or script) changes layer scale visibility? I tried layer.configChanged.connect(self.test_2) layer.flagsChanged.connect(self.test_2) layer....
Dezmonder's user avatar
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0 answers
10 views

Lizmap-publishing WMTS

I'm struggling to read a WMTS layer generated with GeoServer, in Lizmap Lizmap send me this error message service not available
D.T's user avatar
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24 views

QGIS point sampling misses data on edge of raster (possible bug?)

It seems I may have discovered a shortcoming in the way QGIS handles raster sampling in points. Since yesterday evening (18/7), one small issue has begun to elude me (during my comeback geofictional ...
Routhwick's user avatar
0 votes
1 answer
33 views

Clean up polygon after difference tool QGIS

So I'm using the difference tool in QGIS to remove a bunch of areas from a polygon representing a state. Problem is, these areas don't fit together perfectly, and the result looks very messy. How can ...
user240982's user avatar
1 vote
0 answers
19 views

Loading result of PostGIS query that contains temporary table delete statements as new layer

I am trying to run then load the result of a PostGIS query using the DB Manager on QGIS 3.30.2. The query is a call to a PostGIS custom function defined in the database that generates some polygons. ...
Boris CALVET's user avatar
3 votes
2 answers
69 views

QGIS: Horizontal alignment of legend symbol to multi-line label

Using QGIS 3.28.15 I have a legend label that is spanning over multiple lines. Can I horziontally align the coresponding (non-simple fill) symbol to appear in the center of the label?
lzo_mrn97's user avatar
0 votes
0 answers
9 views

QGIS and MapInfo projections - EPSG3301 (Estonian Coordinate system/projection: L-EST97 1 mm)

I have MapInfo .tab file with points. Tab file is created with MapInfo Pro version 2023 (release build 142). The .tab file's coordinate system (projection) is Estonian coordinate system. In MapInfo it'...
Asko's user avatar
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1 answer
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QGIS fill individual sink

I’m trying to determine the maximum extent of a pond when it is filled to its maximum capacity. I think this is the same logic as the sink filling algorithms used for hydraulically correct dem’s - but ...
tomtomnz's user avatar
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1 answer
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Copy and Paste in QGIS for plugin

I want to create a plugin where I can choose a layer to copy and paste. For copying a layer, I will select the specific layer and choose the field and features. Then, for pasting the layer, I only ...
unknown's user avatar
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4 votes
1 answer
44 views

QGIS rotate/translate features on several layers with different geometries simultaneously

I am working in QGIS with three vector layers (points, lines, polygons) and an aerial image. The features from these three layers are "connected", i.e. they should stay in the same position ...
Honeybear's user avatar
  • 2,514
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0 answers
28 views

QGIS - list/string comparison using SQLite

I'm using SQLite to process multiple queries while working with SpatiaLite layers. I need to identify which string has been added to a list after updating the layer. Currently, my approach involves ...
Giene's user avatar
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0 answers
19 views

Performing Empirical Bayesian Kriging in Qgis [closed]

Does anyone know if a plugin to perform Empirical Bayesian Kriging (EBK) is being developed for QGIS? I'm interested in this method because, according to Perera-Burgos et al., 2024: "EBK is an ...
Mariana GN's user avatar
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0 answers
35 views

QGIS CRS differs from CRS extent [closed]

I am having the same issue described in this post QGIS: CRS and CRS in extent different - what to do?, but there are no suggested fixes or answers. I have two polar grid layers, one created by me in R,...
Setophaga's user avatar
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16 views

Multiline legend entry for diagram (pie charts) in QGIS

I have a map with pie charts and I am struggling to format the legend entry for these charts as needed. I know how to wrap "normal" legend entries (add a defined character on which to wrap ...
pottsbill's user avatar
2 votes
1 answer
97 views

Moving features of different geometries at the same time in QGIS

In QGIS 3.34 I would like to move a point feature and a polygon feature at the same time. The polygon is a round buffer around a point. I am only able to edit the point and polygon one after the other....
Kevin_S2021's user avatar
0 votes
1 answer
67 views

Creating a 'group' or 'menu' in QGIS of multiple plugins

I will create a bundle of plugins (one is already created). Instead of storing each plugin loosely as a single plugin, I would like to have them stored in a group,smiliar to a a menu like this: How ...
i.i.k.'s user avatar
  • 1,753
0 votes
0 answers
24 views

Function addgeometrycolumn does not exist in QGIS Model designer

I'm using Export to PostgreSQL algorythm in QGIS Model Designer to load my layer into PostGIS database. You can see the parameters on the screenshot. I manage to connect to the database after I run ...
barney stinson 2's user avatar
0 votes
2 answers
32 views

Splitting lines and getting the lengths in QGIS

I am new to QGIS. I need to split my vegetation line (2.19km length) into segments based on the erosion and accretion and want to get the length of those segments. I was able to split the vegetation ...
Darsh's user avatar
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0 votes
1 answer
32 views

Clip polygon with vector points freehand

I am trying to crop/clip a polygon with overlapping vector data points in QGIS, so that I can extract all points from a certain area. However, I want to clip not based on the polygon but on a freehand ...
Nat's user avatar
  • 63
0 votes
2 answers
54 views

Removing duplicates values from QGIS Attribute table

I have some fields with the same values after that I need to remove them. Some of the values are duplicates after I merged values from different layers and grouped them using the same ID number. For ...
Nista.geo's user avatar
0 votes
0 answers
15 views

Extract regional data from USGS faults KMZ file

I am trying to extract fault data from USGS qfaults.kmz for a specific area so I can get it onto my Garmin GPS. I got the USGS file on QGIS, can see the area I want on the map. But I can't figure ...
John Springer's user avatar
0 votes
0 answers
23 views

Image Coversion tool and Land cover change tool not working [closed]

I am working with QGIS version 3.34.5 and SCP version 8.2.2-infinity. First, SCP Image conversion to reflectance and temperature doesnt detect or pick landsat image lands in Tif or original format ...
Silas's user avatar
  • 1
0 votes
0 answers
32 views

How to make a heatmap to show the distribution of attribute values more accurately?

I want to be able to create a heatmap that shows the distribution of the attributed "carbon" value within a merged layer. I have a merged vector point layer that represents the combination ...
Greeny's user avatar
  • 1
0 votes
1 answer
32 views

QGIS processing plugin: How to select the current layer?

I want to create a plugin, where you create a copy of the selected layer from the project but where you rename the variables in it. I created processing plugin as described here https://www....
i.i.k.'s user avatar
  • 1,753
2 votes
1 answer
36 views

Display the distance travelled while route tracking in QField

We are using QField to track routes and collect data on certain parts of the route. The routes are not predetermined, we decide in the field which way to go. The tracking layer is a MultiLine-layer. ...
Pompoensoep's user avatar
0 votes
1 answer
31 views

QGIS 3.34.7 Single sided buffer changes - creating unexpected result

On QGIS 3.34.7 LTR, if you try to "Single sided buffer" a self closing line/full encircle (yellow line), with a value let's say 2 meters it will create a polygon inside and the edge where ...
Marin Marian's user avatar
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0 answers
40 views

Developing projects using QGIS and QField with QFieldCloud sync

I am quite new to QGIS and QField, but with all the documentation and videos, I have made a good start. However, I think I must have missed it in the documentation for QField and QFieldCloud, but I ...
Karen's user avatar
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0 answers
28 views

Multiple QGIS project files

I'm unable to use the Mergin maps as 'found multiple QGIS project files' I do not know where to start?
Arb-aiD's user avatar
1 vote
0 answers
24 views

Load balanced QGIS servers - shared file system

I would like to setup 2 virtual machines running QGIS Server in a load balanced environment. The load balancer will: handle SSL termination, and redirect HTTP to HTTPS. The two servers will: run ...
Sid Kwakkel's user avatar
0 votes
0 answers
23 views

Water Layer - Lake - QuickOSM - missing

Use : Qgis - newest release OpenStreetMaps QuickOSM - newest release In the past when I was making maps I could find a layer called "(Key) Water" called "(Value) Lake", but I can't ...
stonefox's user avatar
3 votes
3 answers
120 views

Deselecting duplicate records in QGIS Attribute table

Several SE-GIS posts describe how to identify duplicate records, such as Identifying duplicate attributes in field using QGIS. I would like to extend this concept by unselecting any duplicate records ...
Stu Smith's user avatar
  • 8,192
0 votes
0 answers
26 views

Calculating total of points who intersect polygon of another layer in expression builder

I've tried so many ways, but my result is always 0, and I don't understand why. In a table that I created in my layout, in one of the cells, I want to use the Expression Builder to calculate the ...
Skalpa's user avatar
  • 1
0 votes
0 answers
22 views

Point features not rotating when map view is rotated using QGIS

I have a point layer in QGIS with features sorted after a specified value. Meaning, my features are categorized and are symbol layers of type "Font Marker". Now, since they are street labels ...
Juan Sebastian Barajas Narvaez's user avatar
0 votes
0 answers
11 views

Creating a building density layer from point data

I am trying to create a building density layer for large regions. For this reason, I cannot do a count per polygon over a grid (estimation was 70 days for the analysis) I have point data for buildings ...
jamiehk's user avatar
3 votes
2 answers
164 views

Changing values where two geometries are equal otherwise keep value with QGIS Virtual layer

I have two line layers in QGIS, of which one layer (layer 2 - yellow in the image) is a geometrical subset of the other (layer 1- blue in the image). The two layers also differ in their values of a ...
i.i.k.'s user avatar
  • 1,753
0 votes
0 answers
24 views

A LINK error occurred when compiling QGIS3.34.8 or qgis_core of 3.38.0 in Windows using VS2019

I got a LINK error when compiling qgis_core in QGIS using VS2019 Release x64 for Windows, and it looked like this: 4>draco.lib(point_cloud.cc.obj) : error LNK2019: Unparsable external symbol ...
upstairs's user avatar
-4 votes
0 answers
24 views

Get a list of the points of a QgsPolygon, using Qgis PyApi [closed]

I need to isolate the points of: <QgsPolygon: Polygon ((-56320.23199007755465573 -166518.30815678663202561, -56565.95430758487782441 -166969.12154244974954054, -56042.58511950822139625 -166945....
João Marnoto's user avatar
1 vote
0 answers
40 views

Brightness Differences in DEM TIFF File

I created a DEM file with QGIS. File type TIFF. The files I use as sources are also TIFF. The file, which looks normal in QGIS, looks different when I look at it in other programs. When I open the DEM ...
William24's user avatar
1 vote
1 answer
35 views

Show settlement labels on a map based on population and settlement density in different areas

Is it possible to show settlement labels based on population and settlement density in QGIS 3.36? I have two layers of settlements: Biggest Cities Layer: This layer contains the largest cities, which ...
Filip's user avatar
  • 19
0 votes
0 answers
30 views

QGIS Server available only on port :8001

I installed QGIS Server on Windows and Windows Server (x64) following the official guide - https://docs.qgis.org/3.34/en/docs/server_manual/getting_started.html#installation-on-windows Changing Listen ...
9 Val's user avatar
  • 1
1 vote
0 answers
30 views

pgrouting or recursive question?

For a water network, I'd like to count the users and accumulate them. I look at Here's what I've got: and I'd like to get (done by hand): however, with a recursive query, I'm afraid of counting ...
pasqal's user avatar
  • 538
1 vote
0 answers
40 views

Why does my raster look different after clipping it by a mask layer using QGIS?

I have a Digital Elevation Model of Europe and I want to clip it to the extent of Germany. To do so, I am using Clip Raster by Mask Layer with the external frontier of Germany as the mask layer. ...
Jama's user avatar
  • 65
0 votes
0 answers
19 views

How to get the shortest distance between polygons from the same layer? [closed]

I need to know the shortest distance between polygons of the same layer. NNJoin crashes I also tried Join attributes by nearest but the numbers don´t seems to match the real distance between polygons
Joaquín Mazarino Rodriguez's user avatar
0 votes
0 answers
27 views

How to maintain single band in raster export in QGIS

I'm working with a LiDAR DEM hosted on a server and I want to generate contour lines from it. I'm trying to 'Export -> Save As' to create a GeoTIFF, but the output that's created is a 4 band (RGBA) ...
oucil's user avatar
  • 103
0 votes
0 answers
34 views

QGIS Form: The SUM field is not populated as expected

I created a form in QGIS to collate the data from a created points layer. In this layer, I am trying to sum the values from Field_A grouped by Field_B and Field_C. I used the following expression: sum(...
DanReev25's user avatar
0 votes
2 answers
45 views

How to find a list of polygons from one layer that intersects a polygon in another layer

I have two layers with polygons. Layer A has polygons that are contiguous and cover the entire geography. Layer B has individual polygons that are not contiguous and intersect more than one polygon ...
sudeten's user avatar
  • 11
0 votes
1 answer
70 views

Soften/round edges of raster layer using QGIS

I have a raster layer with ocean depths in 50m sqaures. I would like to soften / round the edges of the pixels to look more like a vector. This image shows the look I'm after I only want to edges to ...
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