All Questions
1,690
questions
4
votes
1
answer
116
views
Finding nearest body of water (polygons) in the eight windrose directions from a point using QGIS?
I have a layer of points, and a layer of bodies of water (polygon). I am trying to find then nearest 8 bodies of water, in the 8 windrose directions (N, NE, E, SE, S, SW, W, NW) within a given radius. ...
- 109
0
votes
0
answers
59
views
How to clean polygons with too much nodes outside of them? [duplicate]
I have a layer of MultiPolygon, some of them have too much nodes resulting to this :
Is it possible to automatically delete the nodes that makes extra lines in my polygon or I am doomed to clean it ...
- 11
1
vote
1
answer
89
views
QGIS Rasterize tree polygons - giving priority to higher trees
I used points of trees and created buffers around them based on their canopy widths. I rasterized these polygons and burned tree height as a value (later to be used for shadow modeling).
Important is ...
- 23
3
votes
1
answer
62
views
Distance from centroid to closest edge of a polygon in QGIS
I'm looking to create the geometry of a multi-lined label like so:
However, I need a way for the width of the overall label to shrink as it get closer to the edge so that it doesn't end up going ...
- 31
2
votes
2
answers
85
views
Connecting points to the nearest K polygons in QGIS
I have a layer of point data, and a layer that contains polygons of all the lakes in a region. I am trying to find the K closest of these lakes for each point. The distance should be measured from the ...
- 109
1
vote
1
answer
58
views
QGIS - Export layer with one polygon subdivided as multiple rows to CSV
I have a GeoJSON file with quite precise boundaries of world's countries. I had to simplify it because Snowflake, where I want to keep the data, has 16MB limit and Canadian polygon is always too large....
- 291
1
vote
1
answer
62
views
Producing raster data clipped automatically by multiple polygons in QGIS
I have raster data covering an entire country (say, India) and would like to split the raster image into districts. To that end, I have obtained the district level shapefile and have added it as a ...
2
votes
2
answers
104
views
Merging polygons based on distance in QGIS
How can I merge not overlapping polygons? I'm trying to set up a model that merges polygons that are within 500m from each other, at the closest edge of the polygon.
I have tried with the shortest ...
- 133
0
votes
0
answers
45
views
QGIS 3.22.16 Split road lines at polygon border
I am using the QGIS 3.22.16. I tried to get the length of the roads in each county. I used the clip tool however the road length of the ones crossing the boundary still the same length. By any chance ...
- 321
2
votes
0
answers
115
views
Create a profile of categorical data along a line in QGIS
For a landscape analysis study, I want to extract some categorical data along a line (purple in the image) on the selected area. Before I continue to create an entire plugin to create a categorical &...
0
votes
1
answer
898
views
Could not add feature with geometry type MultiLineString to layer of type MultiPolygon [duplicate]
I´m trying to make the Union of two shapefiles on QGIS 3.28.9 and keep getting this error message:
Feature could not be written to Union_8f811877_53f7_4317_ae22_fe05e7ab9695: Could not add feature ...
6
votes
5
answers
1k
views
Finding overlapping polygons within the same layer in QGIS
I have a polygon layer and want to check if there are some polygons overlapping within the same layer. How can I do this?
In ArcGIS, I could run the Intersect tool only by adding the layer I want to ...
- 466
0
votes
1
answer
58
views
Style a Polygon (speed restriction area) with just an SVG Road Sign at either end of the polygon in QGIS 3
I have a series of "zones" which are polygons along a road which have a speed attribute, I'd like to rather than just shade the polygons based on speed, actually show the 20mph or 30mph sign ...
- 21
0
votes
0
answers
46
views
How to cede overlapping area in polygons in QGIS to one of the polygons based on a condition
I have a shapefile with 2745 individual sites/polygons in the Philippines, each site represents a tree planting project, with relevant information (30 attributes to be precise), including the year the ...
- 13
1
vote
1
answer
132
views
Create a map of time since fire in QGIS
Using QGIS I want to create maps which visualise the fire history of an area, in particular the time since the last fire.
I have a shapefile which contains polygons of each fire that has occurred in ...
- 51