Questions tagged [polygon-creation]

Process of creating geometric polygon features.

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Creating new polygons from intersecting polygon and polylines in QGIS

I want to create new polygons from the intersecting polygon and polylines shown in the images below. At the output, I need to get four polygons representing the polygons shown in the top image after ...
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Creating nested hex grids in QGIS

I'm looking to replicate the kind of map seen here, where there are essentially multiple hex grids nested inside one another. Author : Kate Berg That example was made in ArcPro, I'm working in QGIS 3....
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When drawing a polygon in QGIS, finding a point defined by two known distances

I'm looking for some tool or process that runs just like a tool present in Arcmap called 'Distance Distance'. For example, to draw a irregular rectangle defining the first four points, I would like to ...
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"Has no attribute geometry" error when creating polygon with Shapely

In Shapely I am getting an error: "has no attribute geometry" when I try to create a Polygon from a list with QgsPoint: from shapely.geometry import Polygon points = [<QgsPoint: PointZ ...
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2 answers
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Rotating polygons to follow the curve (line) in 90 degree in QGIS

I have created points on the line with 60m distance. Then I've made square buffers to these points. But they all stand straight. Is it possible somehow to rotate them so they follow the line curves? ...
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Creating minimal enveloping polygon to set of geometries in GeoPandas

To be able to do operations on a set of geometries in a GeoPandas GeoDataFrame, I need to be able to determine whether objects are on the outer "rim" of the set. The set of geometries is as ...
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Combining polygons based on distance matrix in QGIS

I have the following layers in QGIS: a polygon layer made up of all the zip-code areas in Germany a layer displaying all the electricity grid nodes in the country. In a previous step, I created a ...
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Scaling polygons in vector grid around polygon centers in QGIS

I have a aerial image with a vector grid overlaid in QGIS. Is it possible to scale the individual polygons (scale all of them by the same size) around their individual centroids? For example, to cut ...
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QGIS 3.22.4: Exported A0 sized GeoPDF not displaying all polygon data

I generate A0 geoPDFs that contain polygon data for landholders to use when undertaking clearing activities. The landholder uses these maps in Avenza. Recently (~May 2022 onward) I have noticed that ...
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Creating polygons that follow the curvature of the Earth in ArcGIS JS

I am trying to divide a globe into equally sized squares and render them using ArcGIS JS where the rendered polygons follow the curvature of the earth. So far, I've made an algorithm to divide a ...
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Dissolving features based on another layer in QGIS

I have two layers, see image below: Yellow: the ground where people can build; Red: existing buildings. Create a shapefile of all grounds where >50% of the grounds are free. In order to do this, ...
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Buffering roads leads to one big circle in QGIS

I am trying to create buffers around specific roads I am working with. I carried out the following steps: I highlighted all of the roads: I set out to create a buffer zone. The buffer was created. ...
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3 votes
1 answer
120 views

Representing roads consisting of polylines as polygons in QGIS

I am working with some roads in London that I downloaded online. The roads are represented as lines like below: How can I transform each road from a line into a polygon in QGIS? So that the roads ...
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3 votes
1 answer
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Creating multiple inner buffers in QGIS

How can I create a multiple inner (negative) buffer of a polygon layer that starts from an initial distance and repeats n times at a fixed distance? The result should be independent polygons. Ex: I ...
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3 votes
2 answers
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Removing overlapping polygons without merging any polygons in QGIS [closed]

My layer contains overlapping polygons, as seen with some transparency. What could I do to remove the overlapping parts (in dark on the screenshot) without merging any polygon in order to obtain the ...
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1 answer
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Creating polygon around points using ArcGIS Pro

I'm trying to create a polygon that uses the outer points as the boundary (in layman's terms: connect the dots of the outer points to have one polygon that represents the area). I've tried using '...
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1 answer
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Merging multiple intersecting/overlapping polygons in QGIS [duplicate]

Is there a way in QGIS to select multiple polygons and merge only the ones that intersect/overlap with each other? As in the example bellow only those appointed would merge, becoming each a single ...
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4 votes
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Converting lines (edges) to polygons with Python

Is there any working function to convert lines (edges) to polygons with Python or I need to implement it myself? I have pairs of points - edges: [[10464, 27071], [22358, 15839], [10464, 24781], [...
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1 answer
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Create polygons around centroids, maintaining information

I have a csv file which contains points (latitude, longitude) around all the African continent (see the picture for clarification). Apart from the latitude and longitude, it contains more information. ...
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1 answer
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Сreating buffer in meters using GeoPandas

I want to use a built-in function buffer of GeoPandas. I want to create a buffer of 10 centimeters around the original geometry but buffer method take argument in degree, so what value do I need to ...
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7 votes
2 answers
318 views

Creating square polygons of given length from single corner point in QGIS

I have 30 points, each one represents the SE corner of a 1.5 by 1.5m plot. I want to create polygons to represent these plots. How do I create square polygons from a corner point and with a specific ...
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Creating shapefile of concentric circles around point on map using Python

I am trying to model sound propagation from a moving sound source. I have a csv file with lat, long of the source with timestamps every 10 seconds. What I'm trying to do is draw concentric circles ...
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5 votes
3 answers
353 views

Creating circle around point with specific radius taken from column in QGIS [duplicate]

I have a shapefile of points (SR EPSG:3857 - WGS 84), with (in the attributes) an "ID" column for each point, and a "radius" length in meters; I am trying to find a way to create a ...
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QGIS: Add Polygon feature - I want to click on each vertex, but I'm stuck on the curser travel defining the polygon

In QGIS, I have been happily creating polygons using "Add Polygon feature" and clicking each vertex to create my polygon, right click to complete. Now for some reason, The Vertex tool has ...
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5 votes
2 answers
135 views

Creating zones from lines inside boundary in QGIS

I would like to create zones inside a boundary from lines. Hard to explain but you can see my goal in the screenshots below: Each line should have its own zone. Delimited by the zone of the ...
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3 votes
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Polygon/Line/Point-Layer - fill out columns automatically with preset (word/value) when creating entity in QGIS

I have to draw several features like polygons, points and lines by hand in my QGIS project on to defined layers and those layers contain an attribute table with several columns. Is there any way to ...
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3 votes
1 answer
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Deformed shapes after using wedge_buffer as Symbol layer in QGIS

I'm trying to display "field of view" cones on the map, using Geometry Generator as Symbol layer: wedge_buffer($geometry, dir, specs_angle, specs_distance/200000, 0) "dir" : ...
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10 votes
3 answers
338 views

Creating polygon around set of points without blank polygon spaces in between in PostGIS

I want to create a polygon around a set of points which should exactly just contain the set of points without leaving any blank spaces in between. Below is the best output I am getting after using ...
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Changing the origins of SQL Server polygon geometry

I've got a table with polygon geometries, all with their origins @ (0,0). I want to recreate these polygons with the same dimensions, but at different origin points(x,y). Because all the original ...
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2 votes
1 answer
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Merging polygons that touch each other in QGIS [duplicate]

I am searching for a tool that can merge the polygons that touch each other. I am not very good with python or programming. Is there a function in the toolbar that can help me with the problem? In the ...
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3 votes
2 answers
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Extracting polygons from scanned GeoRef images based on colours in QGIS

I would like to extract a polygon based on it's colour from a scanned map georeferenced in QGIS. In the image, I would like to extract all of the blue as a separate shapefile/GeoPackage instead of ...
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2 answers
84 views

Creating polygon bounds by using CSV input in QGIS

I want to create a ABCD-rectangle in QGIS using the coordinates for AB, BC,CD, DA in format (x,y) each. What is the procedure to do this? Also is there any special formatting required for the CSV?
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3 votes
2 answers
82 views

Dissolving isochrones from point layer in QGIS

I have created a set of isochrones (3, 5, 10 minute walk times) from a point layer. I now want to dissolve the layer to make it more readable. However when I try to dissolve based on the field that ...
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1 vote
1 answer
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Aggregating point geometries and creating envelope using Virtual layer in QGIS

I am trying to group points using a Virtual layer and create a rectangle covering an extents but I cannot get it to return the geometry. Current code is this: SELECT VP.Page, st_envelope(...
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1 vote
2 answers
66 views

Line across polygon will not cut it using QGIS

I'm trying to divide up polygons in QGIS with a line I've assembled from a variety of constituent parts. The line has been successfully merged into a single object, and as far as I can tell is a ...
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  • 87
3 votes
1 answer
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QGIS - cutting a shape with multiple non-contiguous lines

I'm trying to cut a shape in QGIS with a set of lines that don't form a single continuous path - they define an edge without holes, but they overlap each other rather than terminating at exactly the ...
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15 votes
2 answers
552 views

Creating equally split buffers between points in QGIS

I want to create buffers for every health facility, but they end up overlapping. How can I create buffers that split equally between the distance of 2 health facilities? Example of the result wanted ...
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5 votes
3 answers
130 views

Mass editing of polygon vertices in shapefile in QGIS

I have a shapefile that contains 10s of thousands of individual four-sided polygons, so I have 5x that in vertices. I need to be able to update the coordinates of every single vertex based on a new ...
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3 votes
1 answer
116 views

Cutting polygons with MultiLine layer using QGIS

I'm trying to cut a polygon layer with a line I've created in part by copy-pasting lines from various source shapefiles and in part by hand-drawing segments to connect those. For clarity, the end goal ...
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  • 87
1 vote
0 answers
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Draw polygon with specific dimensions [closed]

I'm a beginner with QGIS, and I'm trying to draw a polygon that is 10m x 10m with 90 degree angles placed along a line, and centred around a point on that line. I don't know what projection to use (I'...
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1 vote
1 answer
29 views

Merging zipcodes based on population to create larger areas in QGIS

In QGIS I have a shapefile with small geographic areas (zipcodes) with population in each zipcode area. Currently the population per zipcode vary very much, some as low as 1 person living in them. I ...
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7 votes
2 answers
289 views

Transforming all polygons into circles in QGIS

I want to change the shape of all polygons within a layer into circles and maintain their original size. All polygons are different sizes and shapes at the moment, based on the extent of wind power ...
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  • 73
2 votes
2 answers
150 views

Generating random not overlaping circles inside polygon in QGIS

How to generate random circles with certain radius size that do not overlap, inside a polygon?
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0 votes
1 answer
71 views

How to add a border around a GeoTIFF?

I have a 200x200 GeoTIFF from which I am trying to create multiple polygons. I am using different range values to generate different polygons. However, the inverse of the polygons I want are being ...
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2 votes
1 answer
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Output polygon is the inverse of what I need?

I am trying to output a different polygons from a single band GeoTIFF. I am trying output different polygons for specific range values such as 0.4 <= x < 0.5, 0.5 <= x < 0.6 etc (each ...
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2 votes
3 answers
576 views

Getting bounding box polygons from xmin, ymin, xmax, ymax in attribute table

I have a CSV file with bbox extents in xmin, ymin, xmax, ymax format. I can import these as pairs of delimited text layers and see the diagonal extents of these boxes on my map document. Can I take ...
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  • 491
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1 answer
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Can I convert an BND object into an RDS object in R?

I have a general question which is likely to be silly one: is it possible to convert a .bnd object into an .rds object? Briefly, I want to analyze the map in the R package spBayesSurv: library(...
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6 votes
2 answers
235 views

Dissolving multiple overlapping ring buffers in QGIS

I am creating multiple ring buffers around polygon areas of interests. Due to their proximity, some of these are overlapping. I would like to dissolve them into joined features. I have tried dissolve ...
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  • 143
4 votes
1 answer
88 views

Creating circle-like area that encompasses original polygon

I'm starting with a caveat - I'm very new to this. I'm also using spectral tools in MS SQL Server, which probably isn't the best way either. I'm attempting to make a polygon that represents an area ...
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2 votes
2 answers
179 views

Creating grid in QGIS 3.18.3

How do I draw a grid of n by n on the shapefile of a city with a CRS of EPSG:4326? I have tried creating gird in ESPG:32735 I have created a grid using this. Vector -> Research Tools -> Vector ...
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