All Questions
51
questions
1
vote
1
answer
42
views
How to buffer a selected point in PyQGIS
I have a few random points that I generated within a polygon. I randomly selected one of the points and would like to buffer that point. In the case below, buffering will be applied to all points and ...
- 191
0
votes
1
answer
77
views
PyQGIS layer action: Add buffer from clicked-on feature as temporary layer using materialize
In the workshop material "QGIS Automation using Actions", the first example "1.1 Extract a Feature from a Layer" demonstrates how one can extract any country polygon by clicking on ...
- 49
2
votes
2
answers
185
views
Fixing holes in the buffered polygon using PyQGIS
My script uses a buffer and dissolves to create polygons around my points. However, there are holes in between the points. I do not want to increase the distance because then it will also cover the ...
- 163
1
vote
1
answer
59
views
Looking for QGIS processing script equivalent of ST_Buffer [closed]
I have a shapefile layer containing road data and some of the data has entries for both carriageways, the data only has a road name so no way to distinguish between them. I've created a script that ...
- 103
6
votes
1
answer
3k
views
Generating single sided buffers on the same side of lines
I have a line and a point layers and trying to find points 100m to the left of each line.
The image below shows the single-sided buffer result. As can clearly be seen, one of the buffers is generated ...
- 77.3k
3
votes
1
answer
134
views
For loop to buffer shapefile at multiple distances, add each to the layers window, style & save to geopackage; PyQGIS
Can someone help me straighten this code out. I want to create three buffers, at 100, 250 and 500m respectively and add these to the contents table. I've tried creating a for loop but not having ...
- 480
10
votes
1
answer
3k
views
Method for generating wedge buffer in PyQGIS
Is there any method generating a wedge buffer, as in Creating wedge buffers from many to one in QGIS, using QGIS Python API?
I made a search in QGIS API Documentation and GIS SE.
I'm not looking for a ...
- 77.3k
0
votes
1
answer
46
views
Adapting variable difference buffer script from QGIS 2 to QGIS 3
I have a script below which creates variable buffers based on a field "ALT" and the coordinates of many points "X" and "Y"), and dissolves the results. It was written in ...
4
votes
2
answers
432
views
Buffer algorithm doesn't work in a new script from template
I use QGIS 3.10.14 and I begin with PyQGIS.
When I tried to make a simple script which use the native buffer algorithm, the output layer came out exactly like the input layer, with the same polygons ...
- 53
0
votes
0
answers
114
views
MultiRing buffer plugin to Python script in QGIS
Is there a way to get the MultiRing buffer plugin into a Python script?
I want to use it in the QGIS Modeler, but I cannot use plugins in there, or to get multiple buffers with varied (not equal) ...
- 1
3
votes
1
answer
85
views
Buffer output is different for same attribute value in different layers (QGIS 3)
I have two line layers with almost the same attribute table. And I want to create a buffer with "variable distance buffer" from the line's attribute "raiometade" and "raio_metade".
Layer 1 is ...
- 691
4
votes
1
answer
228
views
Export looped layers at once using PyQGIS?
I am trying to use one-side buffer on road centerline (layer name: small_road) by 1~40m. I've succeeded in creating one buffer (2m) file at a time using
'SEGMENTS':2,'JOIN_STYLE':0,'MITER_LIMIT':2,'...
- 329
2
votes
1
answer
66
views
Creating plugin in QGIS
I have a problem with my first QGIS 3 plugin. I want to calculate lenght each segment in my polyline and next creating buffer equal 1/2 length of line.
The first 13 lines code have to do calculating ...
- 55
0
votes
1
answer
227
views
Continuous buffer from individual polygons in QGIS
I have a stream segment for which I am trying to find a buffer around with criteria as 5m of elevation. So for each straight line within a stream segment, I have found buffer (polygon) for it. Now I ...
- 103
1
vote
0
answers
110
views
Create buffer based on the size of a line's length (QGIS) [closed]
I need to create a buffer around a point, witch has to be 1.3x bigger than the length of a given line.
I want to automate this process with graphical modeler or pyqgis. So the program should ...
- 691