All Questions
1,690
questions
0
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0
answers
42
views
How to clip satellite base map into polygons [duplicate]
I'm trying to create a model to detect trees within the boundary of a country in QGIS 3.34. So far, I'm using the Google Maps Satellite base map from QuickMapServices. I created a vector layer where I ...
- 9
2
votes
2
answers
117
views
Converting polygons to lines that are split depending on borders being shared in QGIS
I have a file containing polygons that delineate the boundaries of municipalities within a specific region. I want to convert the polygon boundaries to lines. The resulting lines should be split ...
- 51
3
votes
1
answer
88
views
Mark overlapping areas in QGIS
I have one layer in QGIS with many polygons (drawn in different colors) that partially overlap. How can I mark the areas that overlap separately (e.g. dashed)? Here is an example:
The colors of the ...
0
votes
1
answer
47
views
How do I calculate kernel density home ranges of animals in QGIS?
I am trying to calculate the kernel density home ranges of some animal occurrences in QGIS. I found the following website with a model, how do I import it and run it in QGIS?
https://plugins.qgis.org/...
- 341
3
votes
1
answer
79
views
Dissolve neighbour polygons when distance is below X meters
I like to dissolve polygons in QGIS which are separated by small gaps (streets or paths...). As shown in the picture below, the two polygons in the north should be dissolved, excluding the one in the ...
- 677
2
votes
1
answer
41
views
I have polygon data saved as a long text string of coordinates saved as .csv. How can I add it into QGIS?
The data provided to me are saved as .csv files, and are listed in this manner:
{"type":"Polygon","coordinates":[[[120.9919351,14.5451086],[120.9939584,14.545671],[120....
- 21
1
vote
2
answers
61
views
QGIS - Creating a polygon from a section of a different line
I would like to create a polygon layer using a section of a different line layer. I selected the line component (orange highlight) which came from a high tide line shapefile and would like to use that ...
- 91
-2
votes
1
answer
80
views
QGIS - trying to draw polygons [closed]
I´m complety new in this game, so unfortunately I havent figured out how I get my data into QGIS onto a map.
I got my data delievered in a Excel sheet (no words need) and it looks like this.
I have ...
1
vote
0
answers
43
views
QGIS 3.22.16 using a unique color for each category
I am using QGIS 3.22.16. I am trying to symbolize multiple land owners using the categorize option. However, the random selection brings similar color for different landowner. I tried to use different ...
- 321
1
vote
1
answer
44
views
Extract polygons from TIFF file of depth model
I am trying to create a shapefile of polygons from a TIFF file using QGIS. The TIFF file represents a depth model of Denmark. I want to create the polygons based on a particular depth (-2 meters), ...
2
votes
0
answers
62
views
Why are there so many slivers in my polygon shapefile?
I georeferenced a map and then traced a vector polygon shapefile over it, but when I dissolve it I am left with an enormous amount of slivers. All the vertices are snapped as far as I'm aware. What ...
- 341
3
votes
3
answers
344
views
Getting only the intersection part of self-intersecting polygons in QGIS
I am trying to find places where different features in one layer intersect. An example picture of the layer:
The result I would want from it:
However, at best, using Intersection, Clip or SAGA Self-...
- 31
3
votes
3
answers
73
views
Intersection without cutting off whole polygon using QGIS
I am trying to intersect a larger map of MSOAs with a 50km ring to create a set of MSOAs within the ring. However, I would like to keep the MSOAs whole, even if not all of it lies within the 50km ring....
- 31
1
vote
1
answer
173
views
Creating radial lines from center of polygon to edge in QGIS
I have a set of polygons for which I need 16 radial lines each from the centroid of the polygon to the edge (see image). So far I have only found a python script to create radial points for a circle (...
- 91
1
vote
0
answers
83
views
QGIS ellipsoidal area values changing very slightly between calculations while planimetric values stay the same
I have a number of vector shapefiles that I need to calculate the geodesic/ellipsoidal area for. These shapefiles are accessed and updated regularly, with the area recalculated each time they are ...
- 57
1
vote
1
answer
117
views
Finding rectangular polygons in a multipolygon
I'm trying to do some analysis that requires finding rectangular gardens of a certain size. At present, I only have access to a data set of property extents with buildings punched out with the ...
- 740
1
vote
1
answer
78
views
Finding shortest distance from one point to each polygon and the distance from that point of the polygon to any of the points in the polygon in QGIS
I'm trying to find the shortest distance from a point (point A uploaded as a CSV) to a polygon uploaded as a shapefile (polygon 1) and then the distance from that point of the polygon to any of the ...
- 21
1
vote
0
answers
63
views
Removing the split between merged polygon in QGIS
I merged two polygons within one shapefile and then aligned all the vertices so that they were adjacent, but how do I remove the former edges that bisect the polygon so that the geometry is continuous?...
- 341
3
votes
1
answer
182
views
Combining multiple Polygons into one MultiPolygon in QGIS
QGIS 3.34.3 has a processing function "Multipart to singleparts". But what about the other way around? What is the easiest way to create a MultiPolygon from several polygons?
- 5,857
3
votes
1
answer
256
views
How do I merge/dissolve two polygons within one shapefile in QGIS?
I have a shapefile composed of many polygons. I want to merge/combine/dissolve some adjacent polygons that I have selected within the shapefile into one polygon without any slivers or lines left in ...
- 341
0
votes
0
answers
50
views
Merging Points and Polygons
I'm very new to using QGIS and I'm struggling with one aspect of creating a set of polygons by land tenure.
Essentially I have four sets of landowners each with parcels of land - I have converted the ...
- 1
2
votes
1
answer
97
views
Get the outline of badly optimized polygons (too many vertices?)
I'm trying to get the area of some flooding data. Overall, the dataset is huge and hardly to handle in QGIS. The dataset comes in several shapefiles ranging from 60 Mb to 4 Gb and include several ...
- 21
0
votes
1
answer
90
views
Remove internal boundaries from a polygon in QGIS
I'm currently trying to retrieve XY coordinates from the perimeter of a polygon (using MMQGIS). When I have a single continuous polygon I face no issues. However, when the polygon is a mix of land ...
- 33
1
vote
1
answer
259
views
Moving individual polygons in QGIS
In QGIS I am using the "BreederMap" plugin to define the layout of a large wheat field trial with 10m2 plots. Unfortunately, the lines are not exactly straight (sowing done without GPS and ...
8
votes
1
answer
272
views
Applying pattern only into strip inside polygon border in QGIS
I need to reproduce the style of a raster layer on a polygon layer like this:
where you see in red the hatching inside the red contour of the polygon.
I tried hatched line in the symbology, but I ...
- 1,293
2
votes
1
answer
140
views
How to identify holes of missing geometry enclosed within a polygon in QGIS?
I want to locate or highlight all the holes (invalid interior rings that do not connect at all vertices and edges) and redundant geometry in a polygon shapefile in QGIS so that I can go back and ...
- 341
0
votes
0
answers
64
views
Combining data using QGIS
I have a background in GIS but haven't worked with it in years, and QGIS isn't my strong suit.
I have two shapefile layers:
Layer 1 is polygon, for provincial basemap. I also joined a lot of other ...
4
votes
1
answer
120
views
Making building orthogonalized in QGIS
From the left polygon to right polygon, May I know how to achieve it by using QGIS?
I have tried the orthogonalized tool in QGIS, but there is no change in shape.
- 41
-1
votes
2
answers
191
views
Locate or find holes tool in QGIS for polygon shapefiles [closed]
I want to locate or highlight all the holes (invalid interior rings that do not connect at all vertices and edges) and redundant geometry in a polygon shapefile in QGIS so that I can go back and ...
- 341
0
votes
0
answers
20
views
Reclassifying polygon ID in vectorized raster according to different layer
Goal: I am trying to create a lookup table for depth according to three discharge levels of a river, 250 cfs, 800 cfs, and 1500 cfs. I have raster files for all three that I have vectorized into ...
