All Questions
40
questions
3
votes
2
answers
89
views
QGIS Single sided buffer value of specific area and line length on 90 degrees lines
I need to Single Sided Buffer a specific surface based on a line length, on QGIS.
Example:
line length: 60.367 meters.
area needed from single sided buffer: 452.4 square meters.
theoretic Single ...
- 55
0
votes
1
answer
46
views
Create one-sided-ellipsoid from 'geometry by expression'
I am looking for a way in which, I can create a buffer around a point.
The buffer is meant to be a semi-ellipsoid.
In theory it should be a mixture of 'single_sided_buffer' and 'make_ellipse' ...
3
votes
1
answer
340
views
Buffer is not yielding the appropriate size in QGIS
I am trying to create a buffer of 10 kilometers around each dot already uploaded. The problem is that these buffers seem to be unreasobly larger than 10km. (Portugal). I have tried to use multiple ...
- 33
3
votes
1
answer
390
views
Buffering with consideration of both distance and height using QGIS
I have a shapefile with points including their altitude (Z) and a DEM raster.
Basically, what I want is to create various buffers around the points extending up to 50 meters from them, but at the same ...
6
votes
1
answer
1k
views
Buffer is too small (OSM Data, EPSG 3857)
I buffered some lines with 100 m in QGIS. When I measured it turns out instead of 100 m its 62. I understand the issue could relate to the CRS. I used EPSG 3857 because the OSM map in the background ...
- 677
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
3
votes
1
answer
180
views
Deformed shapes after using wedge_buffer as Symbol layer in QGIS
I'm trying to display "field of view" cones on the map, using Geometry Generator as Symbol layer:
wedge_buffer($geometry, dir, specs_angle, specs_distance/200000, 0)
"dir" : ...
- 336
2
votes
0
answers
87
views
Can QGIS label buffers have a different vertical size than the horizontal size?
I am producing a map which includes a narrow street with parallel boundaries. Down the centre of the street midway between the street boundaries and parallel to them is a line layer which is a ...
- 987
0
votes
0
answers
175
views
Buffer result differ with Shapely and QGIS
I am creating buffers using both Geopandas/Shapely (0.8.1/1.7.1) and QGIS (3.10.10). I see slight differences in the results with both software. I have a projection EPSG: 25832 in both software. I am ...
- 652
5
votes
1
answer
610
views
Creating a combined ring and wedge polygon buffer around vector points in QGIS
I’m used to using QGIS for simple operations, but I’ve not found a solution for this.
I have a few vector point layers containing several hundred points in total. The points relate to a raster layer (...
- 53
0
votes
0
answers
137
views
Projection issues with QGIS 3.16 Swellendam Training data
I am following this QGIS 3.16 training, following it exactly as shown (https://docs.qgis.org/3.16/en/docs/training_manual/vector_analysis/basic_analysis.html), using their provided training data. And ...
- 43
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
1
vote
0
answers
473
views
Buffers are oval not circular
I've tried the solution in this post but haven't been able to resolve so hoping that someone here might be able to help.
I'm attempting to create a buffer layer of 5km radius around a collection of ...
- 73
0
votes
1
answer
618
views
Creating circular buffers around a point in QGIS with Python
I have a script that creates a square buffer of 1 degree around a point in QGIS, through the python console but I am unable to find a way to create circular buffers instead. Also, would it be possible ...
- 203
1
vote
2
answers
367
views
Buffering river but it came out as circle
I'm buffering a river using QGIS 3. I am using 30 meters for my buffer. My problem is the buffers came out as a circle, not following the lines.
This is what happens during my buffer
- 19