All Questions
1,688
questions
1
vote
3
answers
39
views
Reducing decimal places of coordinates in vector data using QGIS
I have polygon vector data, some of the polygons are imported from another 3D program (Agisoft Metashape). The imported polygons have up to 12 decimal places in the displayed coordinates (attribute ...
- 91
1
vote
0
answers
33
views
Convert ~14500 features into ~500 bounding boxes covering at least the same area in QGIS
I downloaded a shapefile from OpenStreetMap that covers all ocean and coastline.
This consists of around 14500 features. What I am trying to do is generate a number of bounding boxes (say 300-1000) ...
- 111
1
vote
0
answers
41
views
Grouping data points based on proximity and minimal count of attribute in QGIS
I am using QGIS to map animal counts on farms in the Midwest US and using a circle polygon to show where there are more than 30,000 animals between all the farms in that specific area. Each data point ...
- 11
3
votes
1
answer
48
views
Merging attributes from line layer and polygon layer in QGIS
I am using QGIS 3.32 and have a grid layer with hexagons (so polygons) and a line layer. I would like the hexagons, which are overlapping the line layer to "take on" the attributes of the ...
- 73
5
votes
1
answer
168
views
Rendering polygon by two variables in QGIS
I have a set of polygons with two variables "variable 1" which can take values A, B, C, D, and E and "variable 2" which can take values V, W, X, Y and Z.
I would want to render the ...
- 231
0
votes
0
answers
50
views
Extracting border from shapefile and then calculate distance to the border
I started with a states boundaries shapefile. I want to extract a part of state border and then calculate the distance of village centroids to the nearest point on this border. I have already ...
- 1
0
votes
1
answer
47
views
How to identify polygons in contact with other polygons with a shared boundary of at least 3 meters in QGIS?
As part of my Master's Thesis, I deal with the development stages of unbuilt building land. I intend to divide the units of unbuilt building land within the selected settlements into 5 levels and for ...
3
votes
2
answers
107
views
QGIS - Delete lines resulted from Symmetrical Difference/Clip
I used the symmetrical difference command with two shapefiles but the resulting layer containes lines due to minimal differences (see example picture below)
Is there a way to automate the removal of ...
- 33
0
votes
0
answers
17
views
Setting map extents in print composer using a polygon layer?
I have a group of data points that need to be encapsulated within different polygons. I have used the geometries by expression tool to generate a layer of these polygons. I'm trying to feed the ...
- 21
1
vote
1
answer
45
views
Calculate ratio of 2 polygons using QGIS modeler
Working with QGIS modeler, I need to do some arithmetic operations with some polygon areas.
Let's say there are 2 polygons in layer A and layer B. And I'm inputting them into the model using Vector ...
- 123
0
votes
0
answers
25
views
"ERROR: 22001: value too long for type character varying(6)" for polygon shapefile
I am facing an error
ERROR: 22001: value too long for type character varying(6)
while uploading a shapefile to online govt. portal. When I asked the person only mentioned that there is problem with ...
- 1
0
votes
0
answers
25
views
"Add Polygonal Object" button does not appear on toolbar
I use QGIS 3.36.2 and I would like to create Polygon by drawing directly on the map. So I would like to use the "Add Polygonal Object" button while edit mode but there is no one on my ...
- 1
0
votes
0
answers
40
views
QGIS - divide inside of polygon into smaller defined polygons
I have the following polygon in QGIS. It is roughly 260m x 20m
Within it, I would like to create smaller polygons like so in QGIS:
12 - 20ft rectangles
15 - 40ft rectangles
^ for 7 rows
(very badly ...
- 41
0
votes
1
answer
64
views
Creating a vineyard map with QGIS
I'm trying to plot dots (the vines) in an irregularly shaped polygon. they are in parallel rows spaced 1.4 m apart and the vines are spaced 1.2 m apart. The rows are at a 45º angle from N. I tried to ...
5
votes
3
answers
266
views
Creating list of adjacent polygons in QGIS
The answer to Using join in Mapviewer describes an effective way to count the number of adjacent polygons. However, I need to create a list of the adjacent polys.
I envision a process that generates ...
- 8,150
0
votes
2
answers
64
views
Converting vectorization (raster to vector) with small steps in values in QGIS
I have a raster file that contains water depths in m. The water depths are the only attribute and should be transferred to the vector layer.
The raster files have a cell accuracy of 1m x 1m. I would ...
- 19
1
vote
0
answers
16
views
Adding cells to raster layer after merging raster layers in QGIS
The issue
I have a raster layer that represents a river catchment. I want to use it in software that requires the exit of the catchment to be at the edge of the extent. To do this I need to add some ...
- 521
0
votes
0
answers
48
views
Importing polygons from a text file to draw over the TIFF image (GeoTIFF)
I am working on a project in which detection happens for the ships in the TIFF images.
After detection, rotated bounding boxes are plotted over the TIFF images as a layer of the fabricJS.
Due to ...
- 21
3
votes
2
answers
147
views
Preventing polygons from overlapping after splitting them in QGIS
I have a FileGDB with several polygons. When I split them using the Split Features-Tool, they overlap with other polygons within the same layer I did not split.
Here are some screenshots:
Original:
...
- 466
2
votes
1
answer
77
views
Split polygon based on what's visible on the screen
I have two datasets - a large polygon that contains all wards boundaries, and a gps coordinates of places visited, that fall within a city's boundaries as well as slightly outside. I'd like to save a ...
- 21
0
votes
0
answers
40
views
Merging grid vectors that are touching one another in QGIS
As in the picture below, I am trying to merge the grids that are touching one another into a single polygon. I tried using the dissolve configuration on QGIS but it produced either 1) a vector polygon ...
- 21
0
votes
1
answer
35
views
New flow direction attribute for sub-catchment layer in QGIS
I have a polygon layer in QGIS with self-created sub-catchments. I also have a DEM, a flow-direction raster and a raster with the corresponding stream network and stream order. I would like to create ...
- 75
1
vote
2
answers
86
views
QGIS - Synchronize polygons changes between layers
I'm working with two distinct SpatiaLite layers, each with specific fields (they are not duplicates of each other).
While working on HABITATS_POLY, I aim to update ZONES_HUMIDES_POLY based on field ...
- 753
0
votes
0
answers
34
views
QGIS: Further subdivide sub-catchments based on DEM
I have a DEM and a vector layer with existing hydrological sub-catchments. Is there a way in QGIS to further subdivide the sub-catchments based on the DEM?
- 75
8
votes
3
answers
635
views
Removing polygons that look like lines in QGIS
I calculated the difference between 2 massive polygon layers with the Difference tool in QGIS. I get the result I wanted...more or less. The problem is that there are a bunch of lines that appear in ...
- 135
0
votes
0
answers
74
views
Buffer around outer edge of polygon
I'm working in QGIS. I have a multipolygon layer and I want to create a 1.5 mile buffer around the outer edge of each polygon.
The output of the Buffer tool (set to 1.5 miles) doesn't quite reach 1.5 ...
- 649
0
votes
1
answer
58
views
Fill holes in polygon that does not connect with surroundings
I have created a vectorization from a raster of a sea model of Denmark as suggested here https://gis.stackexchange.com/a/478370/240539 using QGIS.
I get this vectorization:
I wish to fill the holes in ...
3
votes
2
answers
279
views
Removing overlapping features in one layer in QGIS
I have a dataset in QGIS with polygon features that partially overlap completely. I would like to delete the overlapping polygon features so that each area is only covered by one feature. The decision ...
- 75
0
votes
0
answers
40
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
116
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