All Questions
1,688
questions
1
vote
2
answers
115
views
Polygonize black areas (0) in raster
I have satellite imagery. Some of these images have black areas (zero values). I would like to polygonize the black areas. Is this possible using QGIS or rasterio?
- 95
2
votes
3
answers
467
views
Making an octagon using QGIS geometry generator
I am a self-taught QGIS user and am trying my hand at the geometry generator. I have been tasked with creating a map that has gazebos as points. There are so many easier ways to get a polygon like the ...
- 81
0
votes
1
answer
38
views
How would I go about efficiently digitizing intersecting polygons from a georeferenced map by snapping vertices in QGIS?
I have a map I've georeferenced in QGIS that has a lot of intersecting and adjacent polygons. I want to efficiently snap the vertices together as I draw the polygons because I don't want overlaps and ...
- 343
2
votes
1
answer
112
views
Inserting a layout shape between maps in QGIS
At QGIS 3.34.1, I have created a layout with two maps superimposed over each other. I need to sandwich a rectangle (using Add Item > Add Shape > Add Rectangle) between the two maps.
When I ...
- 8,150
2
votes
0
answers
37
views
Merging smaller polygons into bigger surrounding polygons in QGIS [closed]
I am using QGIS 3.34.2 (Prizren). I am using a village-level shapefile which I downloaded from SHRUG. I have to use only the villages in West Bengal for an analysis. Furthermore, I need to combine the ...
- 31
3
votes
2
answers
134
views
Measuring border segment length while creating a polygon in QGIS
I am recreating historic (1770s) land parcels for an area of a town based on their description in written deeds. This will be a series of intersecting polygons when I am finished, with many sharing ...
- 31
0
votes
0
answers
83
views
Selecting polygon based on value present in field using QGIS Graphical modeler
I have a layer (polygons) of municipalities and I need to select just one polygon based on their name (e.g. 'venice' this value is present as a value in the field "COMUNE" ) because this ...
- 1
4
votes
3
answers
167
views
Splitting polygons though centroid like Pizza Slices in QGIS
I am aware of how to create centroids and how to divide a polygon by line, but not how to create those lines from each centroid.
I was wondering if anybody knows a technique/algorithm/plugin that ...
- 81
1
vote
0
answers
61
views
QGIS Elevation profile using Point Cloud and Polygon layer with Z value
I'm trying to use the Elevation profile tool with a point cloud and a polygon layer (with Z values). I wish to use the "capture curve" to view a section and I expected to see the polygon ...
- 11
2
votes
0
answers
65
views
Selecting features based on minimum overlap with another layer in QGIS [closed]
I have a "sites" vector layer with 300 polygon features and a "heathland" vector polygon layer, showing the locations of heathland areas. I am looking for a way to select all ...
- 57
0
votes
0
answers
27
views
How geolocalisate a new image with a polygon (JSON file)
I am new using QGIS. I got an Sentinel-1 image from Copernicus I downloaded it as TIFF. I did Python code to detect water so now l have a new plot. I would like this plot gets the same coordinate than ...
- 1
2
votes
2
answers
65
views
Splitting polygon that is result of difference function between two polygons in QGIS
So I have this polygon (picture 1) that will be used to make its bounding geometry as shown in the second picture.
After making this bounding geometry, I wanted to make the difference polygon from ...
- 21
0
votes
0
answers
69
views
Getting max value of "HeightAboveGround" inside polygons from point cloud
I have geojson file with polygons of tree locations and labels "Tree" (~5,300 polygons). And point cloud made from aerial images and points have extra information "HeightAboveGround&...
- 1
0
votes
1
answer
122
views
Interpolating polygon values based on neighbouring polygons in QGIS
I have many polygons, some have values, others don't. In the image, you see an example. The two grey polygons don't have values, while others have:
Is there maybe a tool in QGIS which can help with ...
- 1,679
6
votes
3
answers
369
views
Labeling count points within dissolved buffers in QGIS
I am using the following expression to visualize with a buffer, the nearest neighbors at a given distance:
case when
distance(
$geometry,
array_get(
overlay_nearest(
layer:=@layer,
...
- 2,419