All Questions
845 questions
2
votes
1
answer
660
views
Labelling lines with multiple fields in QGIS
I need on the linear value such an effect as on the point. That is, that the three labels should be next to each other and decrease and grow dynamically. On the screenshots you can see that this is ...
- 21
0
votes
0
answers
682
views
Merging vector layers and deleting duplicate geometries
I merge 3 extracted layers with different counts of parcels but some attributes contain same data.
For example:
Having same data input creates duplicate parcel, was able to clean this with delete ...
- 11
3
votes
1
answer
170
views
Check if other features besides atlas feature are displayed in the map
I am making an atlas in Print composer and I want to check if other features besides the atlas feature are present in the map. In the Print composer map below, the (current) atlas feature is Licab, ...
- 952
4
votes
2
answers
645
views
Limit the number of features rendered in a map
I have a layer of village points and I want to limit the number of features rendered to a maximum of 50 points. I tried using Layer Properties > Labels > Rendering > Limit number of features ...
- 952
5
votes
0
answers
58
views
How to eradicate excess lines in a singly recorded polygonal line (road) network? QGIS 2.8
I'm a beginner in GIS software.
I'm trying to create a road network shapefile within the reserve I work at. To do this, I've driven each and every road inside the property with my GPS app set to ...
5
votes
1
answer
500
views
Select and load polygons intersecting another with PyQGIS (polygons stored in PostGIS)
I'm still a newbie at Python and I'm having issues selecting and loading polygons intersecting others with PyQGIS.
I managed to use PyQGIS to achieve that operation with shapefiles stored in my laptop ...
- 2,150
2
votes
1
answer
2k
views
QGIS 2.14.17 repositories "unavailable" can't install plugins
I can't access the plugin repositories. If I go to plugins -> Manage and install plugins and settings I get unavailable for QGIS official repositories with URL "http://plugins.qgis.org/plugins/...
- 21
0
votes
0
answers
51
views
QGIS 2.18 selected features not working in processing algorithms
After reading up on processing algorithms I see there is not an option to have a "selected features" checkbox. It states in the documentation:
Algorithms follow the following simple rules when using ...
- 303
1
vote
0
answers
238
views
GeomorphicFloodArea Plugin is not working
I'm trying to get the plugin GeomorphicFloodArea to work but cannot.
I tried using QGIS 3.10 but got an error message, so I downloaded version 2.18.28 and it still will not work. I get an error ...
- 11
0
votes
0
answers
46
views
QGIS's "setItemPosition" doesn't seem to work for QgsComposerLabel
I'm using QGIS 2.18 and I'm printing maps using a QGIS plugin I made myself. The method setItemPosition(x, y) is working fine with my legend (QgsComposerLegend object).
But when I try to use the same ...
- 183
0
votes
1
answer
460
views
Using Rasterize Tool (vector to raster) of QGIS
I am using QGIS 2.18.28.
I am trying to convert a vector file into a raster using the rasterize tool however it us just producing a back block of a single value. I am rather confused as I have used ...
- 25
0
votes
0
answers
53
views
QGIS version 2.18: Is there a processing tool in version 2.18 that is similar to "Sample raster values" in newer QGIS versions?
I am using a server (Compute Canada) and they have version 2.18 of QGIS loaded. I need to extract values of a raster to points (long/lat) - equivalent to "Sample raster values"- and be able to ...
0
votes
1
answer
774
views
How or where to install Python plugins in OSX? (QGIS 2.18)
For a school assignment we are using QGIS 2.18 (professor's suggestion) and 2 plugins he gave us. I am working on an iMac. The short manual he gave us is for use of QGIS under Windows.
I have QGIS 2....
- 3
1
vote
1
answer
506
views
How to get RGB fill color values from polygones?
I'm trying to get color values from layers inserted into canvas. I used this code but it seems that I'm doing something wrong:
for layer in QgsMapLayerRegistry.instance().mapLayers().values():
...
- 145
4
votes
1
answer
149
views
Differences in the Select by expression between QGIS 2.18 and 3.4
I want to select in a population table the growth rate between two years greather than 1.5.
In QGIS 2.18 the following expression works fine
"POP_P2014" / "POP_P2000" > 1.5
With the same data ...
- 175
1
vote
1
answer
2k
views
QGIS SAGA "Kriging" tools doesn't work
I try out different methods of point interpolation for a digital terrain model. For this purpose I tried to run the "ordinary kriging tool" from the SAGA Tools with QGIS 2.18 and QGIS 3.2.
When I run ...
- 399
4
votes
1
answer
1k
views
Faster, more efficient way to extract stream network from DEM
I am using QGIS and use r.stream.extract to extract the stream lines from a single DEM tile. However, this takes long (about 15 minutes) to complete, especially for a rugged terrain. I plan to extract ...
- 952
1
vote
0
answers
131
views
QGIS Server 2.18 GetPrint doesn't wait for XYZ tiles
I am trying to generate a PDF output with a Print Composer using QGIS Server 2.18. The map includes a couple of layers from local shapefiles, and also an XYZ Tile Server layer.
QGIS Server does not ...
- 11
2
votes
1
answer
86
views
Using composer manager in QGIS 2.8.1 to export the current canvas as PNG?
I am a newbie to QGIS Python. I have a shape-file which I want to load to QGIS 2.8.1 and manipulate them by zooming to the layer of the preferred shape-file.
Once I have my canvas ready, I want to ...
- 141
3
votes
1
answer
279
views
Auto populate qgis file name with no file extension?
I'm looking to be able to auto populate an attribute field with the project file name either by a virtual field or default option in the properties. The "@project_filename" expression always produces ...
- 263
1
vote
0
answers
76
views
Is there a tool to cut a polygon with the outline of a raster layer?
I would like my polygon layer to be cut into two where the end of the raster layer meets the polygon, is it possible? I've tried to polygonize my raster layer, but that doesn't seem to work. Any ...
- 11
1
vote
1
answer
753
views
QGIS shows the same label twice
In QGIS 2.18, I have a shapefile of lines whose attributes are the lengths (in Km) of the lines. When displaying the labels of this attribute they appear repeated, as seen below:
How do I get the ...
- 45
5
votes
1
answer
498
views
Where did checkbox option in Points to Path tool go?
I made considerable use of the "Points to Paths" tool. I forgot which QGIS version I was using, but it was most likely 2.x, probably 2.14.
According to my memory and notes the tool had a ...
- 8,356
1
vote
0
answers
51
views
Find Topology error in polygon layer
I try to find topology error in this polygon layer using QGIS 2.18 with topology rule of "must not overlap":
but i don't understand why with the Topology checker, only several areas marked in red, ...
- 4,082
2
votes
0
answers
232
views
Saving what is inside a polygon coordinates as an image?
I am trying to get an image from inside a polygon.
TLDR;
What I am trying to do: save what's inside a polygon as an image.
What is happening now: I am only able to save the canvas as an image. ...
0
votes
0
answers
339
views
Login as another user in PostGIS using QGIS 2.18 without restart
I have a PostGIS DB with three roles: admin, user and readonly.
When I set up a connection to this database via "Add PostGIS layer" this connection is saved as it should be. So I login as admin to ...
- 35.6k
2
votes
1
answer
526
views
Where is config file for QGIS 2.18?
I search the config (.ini) file for QGIS 2.18 on my pc.
For QGIS 3.4.8 the file is stored under this path
C:\Users\AppData\Roaming\QGIS\QGIS3\profiles\default\QGIS\QGIS3
I can´t find this file for ...
- 427
2
votes
2
answers
1k
views
Stitching Sentinel 2 neighboring images in QGIS
I'm working with Sentinel 2 imagery, and don't know how to stitch neighbouring images. The problem is that the region im analyzing is on the border of the orbit, and there's a region with no data.
How ...
- 41
1
vote
2
answers
1k
views
Customize symbols in QGIS
I am using QGIS 2.18 and I am trying to add symbols to my map but I cant find the kind of symbols I need. Is there a way I can get symbols depicting security threats, flooding, violence?
- 145
3
votes
1
answer
118
views
Multiple layers auto-updated when one of them is modified
I just discovered this post and I found what I searched here. But I was wondering if there was a way to have multiple layers (let's say l1, l2, l3, l4) being updated automatically when you change ...
3
votes
1
answer
236
views
QGIS - Create buffer circle around particular point using its geometry
Can I create a buffer circle around a particular point using its geometry in pyQGIS? I have my code as below:
myVariable = '123456'
expr = QgsExpression( "\"identificatie\"={}".format(str(myVariable))...
2
votes
1
answer
1k
views
Calculating volume of buildings using QGIS?
I am working with QGIS 2 or 3
I have DSM and DTM already so I can calculate DSM - DTM:
Plus, I have shapefile with buildings' footprints.
How to calculate volume of every single building using DSM-...
- 367
2
votes
1
answer
229
views
QGIS very slow and stops when increasing points size / number
I used the "graduated" style option to represent data by year.
Then for each year I used this method with a custom function to increase point size according to the number of points at the same ...
- 351
0
votes
0
answers
50
views
Rectangular (not square) pyramid with QuickMapServices
I’m using QGIS 2.14.9 (upgrading is not an option), and QuickMapServices. I have two tile servers (one for images and one for OSM). Images work, OSM does not. I'm sure the problem is related to ...
- 83
5
votes
1
answer
626
views
Using expressions to relate column to layer style in QGIS?
I have a QGIS project with N layers, each pointing to the same CSV file with columns "1_1, 2_1, ..., N_1".
I would like each layer to refer to its respective column (Layer 1 -> column 1_1, and so on) ...
- 153
0
votes
1
answer
260
views
Error message using sDNA Prepare Network
I'm preparing a road network using the sDNA Prepare Network tool on QGIS 2.18.28. My OS is Windows 10 64 bit.
I get the following error message:
Algorithm Prepare Network starting...
****************...
- 1
2
votes
0
answers
146
views
Resolution/displaying issue with legend item in QGIS
I'm having an issue in QGIS print composer. I am using QGIS 2.18.
Some of my legend items are displayed in low resolution or are partially cut off. The strange thing is that some groups of the legend ...
- 251
1
vote
0
answers
410
views
Is there maximum number of points you can import from CSV to QGIS 2.18
I tried to import a CSV file which contains 4,783 rows. However, only 20 records appeared. Any one has solutions to solve this situation? How can I add all rows in QGIS delimited layer?
PS: I use Mac ...
- 11
2
votes
0
answers
150
views
Migrate QGIS2 projects to QGIS3
I have about 40 QGIS2 projects. If I open them with QGIS3 labels and svg icons are not displayed. I don't know if there is any other feature that is not working when upgrading to QGIS3, but I suppose ...
- 3,768
2
votes
0
answers
39
views
Cannot find Grass7 folder in QGIS 2.18 content folder
I have freshly re-installed QGIS 2.18.28 in the prescribed order.
I was under the impression Grass7 in included in one of the install packages.
But when trying to point QGIS to the grass7 folder under ...
- 101
3
votes
0
answers
2k
views
QGIS tile cache not working
I'm new to QGIS and work on an air-gapped system where I have access only to QGIS 2.14.9-Essen. I create a WMS layer, which "works" but performance is abysmal. So I enable caching (Settings > Network) ...
- 83
1
vote
1
answer
141
views
How are the joined results different between choosing “Only keep matching records” and “Keep all records”?
I don't really understand the main difference between these two functions? What are the key differences between these two options and why are they different? Like what makes these two so different ...
- 11
1
vote
1
answer
1k
views
Importing animated GIFs in QGIS
Is it possible to import a animated GIF into QGIS? And is it also possible to georeference it, to have it on the right place?
- 45
2
votes
1
answer
421
views
Creating an Action in QGIS with multiple Expression?
I want to create an action in QGIS with multiple Expression. But unable to do so. I want to open images from two different directories with one action. Is it possible? How can I do so?
e.g.
Type : ...
- 21
2
votes
0
answers
106
views
How to switch on snap option in QGIS 2.18 when creating customize polygon
How to switch on snap option in QGIS 2.18 when creating customize polygon as in:
class customPoly(QgsMapToolEmitPoint):
def __init__(self, iface):
self.iface = iface
QgsMapToolEmitPoint....
- 59
3
votes
1
answer
207
views
Counting number of roads between two points using QGIS
I use QGIS 2.18 and I have a point shapefile of many animal locations and a shapefile of roads.
I want to use QGIS to tell me how many roads are between each pair of animal locations.
So, basically ...
8
votes
3
answers
1k
views
What happened to QGIS 2.x LTR?
I've been using QGIS 2.x LTR version for quite some time now (mostly for Lizmap webclient because 3.x didn't perform as well), but today as I wanted to install QGIS on another PC, I realized I couldn'...
- 799
1
vote
1
answer
57
views
operator FIELD_NAME IS NULL is not working
I have a map of soil properties. I am trying to exclude areas that are designated for protection from a selection on this map.
I have tried to use the following query:
SOIL_TEXTURE = 'clay' AND ...
- 13
1
vote
1
answer
505
views
QGIS filtering a whole field using NOT
I'd like to negate some values from my map using the NOT operator.
However, i need to deselect a whole field which contains over 600 entries so I don't want to select each. Is there a way to do this?...
- 11
1
vote
1
answer
111
views
Why "Unique ID fields" is not saving its value in Dissolve algorithm in Graphical modeler?
I am working on my project in QGIS 2.18 through Graphical modeller and using some basic algorithms for polyline objects.
However, I do not understand why specification for Dissolve algorithm cannot ...
- 34k