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
1
vote
1
answer
123
views
Multipolygon to Points
I'm currently mapping out around 10 layers worth of polygons all in a polygon feature as shown in the image below.
I'm now trying to create a heatmap for each layer to show where lies the highest ...
- 11
1
vote
1
answer
404
views
Showing differences between two sets of geometries in QGIS
Can QGIS show the differences between two sets of polygons?
A map is filled completely with adjacent object geometries, so there are no gaps or overlaps. An object could be a street or a house.
You ...
- 131
0
votes
2
answers
251
views
Deleting polygon constituted of many parts
I have a shapefile with multiple polygons and I would like to delete those which are constituted by multiple parts, as this one:
- 309
2
votes
1
answer
179
views
Numbering polygons according to starting point in QGIS
I need to number the polygons in a certain order in QGIS 3.26. A good solution is the command according to @Babel's solution https://gis.stackexchange.com/a/417062/218260, but if the line crosses the ...
- 41
0
votes
1
answer
68
views
Joining polygons touching and merging in one
I am working in QGIS, doing research in different types of forest reserves. I've got this layer of reserves which are for some reason divided into a lot of small polygons (image below).
I want to ...
- 11
2
votes
1
answer
85
views
QGIS boundary select smaller polygons that are contained within larger polygon
I have two layers which are perfectly nested. There are dozens of SA1 polygons (thin grey outline - see image attached) within the LGA polygon (thick green outline - see image attached). I would like ...
- 51
0
votes
0
answers
44
views
Buffer output issue QGIS
I'm using QGIS 3.18 version. I tried to use the buffer tool with the centerline (provided for a sample) of the road.
I found overlapping of buffer polygons and some unusual shapes of polygons too. I ...
2
votes
1
answer
111
views
QGIS is shading some polygons with an unexpected darker color
Using QGIS 3.32.0 on a MBP to create a map of Los Angeles parcels in an area of interest. I have applied a categorized polygon fill symbol to a field I added to the shapefile and for some reason many ...
- 295
0
votes
0
answers
17
views
Parcels disappear when splitting polygons in QField
I have found that when I split polygons using the digitising tools in QField then the neighbouring parcels disappear when the project is synced with QGIS. How can I prevent this?
E.g. I have three ...
- 1
1
vote
0
answers
71
views
Creating line inside polygon using QGIS
I do have polygons in different shapes, most of them squeezed.
How can I create one line inside each polygon, along? I have checked it in QGIS but could not find a way to do it.
I have tried to create ...
2
votes
1
answer
122
views
Clip raster to certain pixel size in multiple mannualy selected locations in QGIS
I want to manually select and clip several areas in a raster layer and get the outcome of a certain size in pixels (e.g. 500x500px).
I would approach it with first creating polygon shapefiles over the ...
- 21
2
votes
1
answer
53
views
Merging overlapping parts based on priority in QGIS
Let's say I have two polygons for Protected Areas in my country, one for a National Park and one for a National Forest and they have an overlapping part.
I want a tool that removes this overlap from ...
- 29
0
votes
2
answers
72
views
How do you add information to a polygon from multiple polygons based on location in QGIS?
I have a couple of points and have made a buffer layer of 1km around each point, which contain information about which point it represents. I have another raster layer (containing information ...
1
vote
0
answers
52
views
Having vertex labels outside of a polygon unlike having all on the same side of the vertices
I would like to have the labels of the vertices stand on the outside of a polygon. In the diagram attached, A and D are on the right side of the vertices but I want them to appear on the left side of ...
1
vote
0
answers
102
views
How many coordinate pairs POLYGON(()) needs in QGIS
I have a .csv file containing a POLYGON(())). For years I have been using 5 pairs of coordinates to draw a 4 sided polygon; the first and last being the same to 'close' the shape. That idea is based ...
- 455