Questions tagged [polygon-creation]

Process of creating geometric polygon features.

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1answer
34 views

Making polygons created by Concave Hull algorithm contiguous

I have a set of points grouped and enclosed by a Concave Hull polygon as in this question. Within an outer boundary that encloses all the polygons I would like to make these polygons contiguous, that ...
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1answer
33 views

Split polygon into smaller polygons based on areas that are covered by lines in ArcGIS Pro

I am trying to split a map of an island into attribute (primary substation) areas in ArcGIS Pro. I have network locations (lines) which I have split into primary substations (as shown by the image ...
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0answers
19 views

Distinguish between filled polygon and boundary

I am trying to convert the raster images to vector and get the inner filled polygon. But the filled polygon and its boundary are wrongly detected for some cases. Below is the code where I tried to ...
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1answer
18 views

Retaining Feature class Information Using Construct Polygons Modify Feature in ArcGIS Pro

I have a polyline feature I need to turn into polygons but I don't have the license which would allow me to use the feature to polygon tool. The workaround as suggested on the Construct Polygons From ...
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0answers
37 views

Create letters as geometry polygons from SVG files?

After searching a lot and not finding a definitive direction, is there a way to create geometry for a map that contains letters? I want text that is not a label or a symbol but lays flat as geometry ...
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0answers
21 views

Create Polygons in Python that use the max extents to make a box

I have field collected data that is usually collected with 6 points to create a form of polygon. I can subset those 6 points and create the polygon no problem, with this code: eastList = channelFilter[...
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0answers
21 views

Creating shapefile using GDAL OGR? Script runs but does not create the files

This script runs but does not create the shapefile files. It works, however, if I were to replace the driver for GeoJSON and create a GeoJSON file. Context: I'm working through Chris Garrard's "...
6
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1answer
111 views

Creating polygon from two not connected linestrings using shapely

I'd like to know if there is a way to create a polygon in shapely from two not connected linestrings. I've been struggling with this question from some hours now and I can't find a way to deal with it....
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1answer
33 views

Reading or creating empty shapefile in R

I have several polygon shapefiles that I need to merge into one using a loop in R. I want to start with an empty shapefile and merge it with the existing shapefiles. All shapefiles will be chacked ...
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1answer
81 views

Lat/Long data to shapefile with many values in CSV dataset

I have my polygon spatial data in a format of CSV with the column of lat/long delimited by comma. Is there any way to upload this csv and got polygon shapefiles (or any other visualisable format)? My ...
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1answer
126 views

Polygon Produced Using Geopandas Buffer Not Correct Size

I have created 2 plots as pictured: The blue (with red outline) polygon should be a 10KM circle around the central dark green point in both plots. This is correct for the right hand side plot (the ...
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0answers
27 views

ArcMap Basic License - Create exterior boundary around polyline features based on centerline layer

I have access to ArcGIS with a basic license at work. I have been tasked with creating a boundary outline of every route polyline feature whose shape is also based along the city street network base ...
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2answers
494 views

Generating rectangle centered by point in QGIS

I have a layer which contains points. The layer has height and width attributes. I need rectangles around those points, but a point should be in the center of the related rectangle whose height and ...
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2answers
63 views

Creating polygon and adding it as new layer with PyQGIS

I'm attempting to add a polygon to a new layer using PyQGIS in QGIS 3.14. Adapting some examples from questions and answers here and here. I believe I have successfully created the polygon from an ...
5
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1answer
121 views

Creating polygon out of list of points QgsPointXY

I am attempting to create a simple polygon on QGIS 3.14 using PyQGIS by adapting the code from How to draw polygons from the python console?. I am running into an error with the setGeometry line where ...
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2answers
564 views

Fitting rectangle with maximum area inside polygon in PostGIS

I am looking to fit a rectangle inside a polygon which would have the maximum area for the rectangle. I tried using ST_OrientedEnvelope(geom) but this would give the rectangle fitted outside the ...
4
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1answer
144 views

Creating new polygon in between other polygons?

I want to fill the missing space and create a polygon out of it. How do you do that with QGIS? The missing space is the white part between the selected/yellow polygons. Here is a snapshot:
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1answer
30 views

How to delete the existing polygon feature value inside the new polygon so that it borders the new polygon instead of overlapping?

Using arcGIS 10.7 Trying to create a polygon feature inside an existing polygon using the Create feature tool in Edit mode. How do I delete the existing polygon feature value inside the new polygon so ...
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1answer
29 views

Divide batch of polygons inside shapefile into aligned grid using ArcGIS 10.4 [duplicate]

I have a polygon shapefile that contain a batch of rectangular polygons with almost equal dimensions. These polygons are not touching each other, they are on some distance. Now I want to split or ...
5
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2answers
65 views

Generate parcel-adjacency polygons?

I have a parcel layer (blue polygons) and a road centerline layer (black lines). I want to generate polygons that represent the portion of the road right-of-way that is adjacent to each parcel (...
0
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1answer
52 views

How to use a specific AREA (km2) to create a buffer-like feature around a polygon (Area to Buffer)

How to create a buffer (or buffer-like feature) based on a specific area (in km2)? I have a specific area (e.g. 14.5 km2) and would like to lay this area as a buffer (or something similar to a buffer)...
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0answers
23 views

How to Split building outlines polygon into individual features/buildings?

Like the title suggests I have ONE Building Outlines Polygon where instead of all the buildings being split into their own features they are all in one feature. How can I split these into individual ...
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1answer
45 views

How to create polygons with a set area in MapInfo?

I need to create polygons with set areas in MapInfo. There is a solution for QGIS in the form of the the QAD plugin but I can't find an equivalent tool for MapInfo. The task I'm actually trying to do ...
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1answer
90 views

Erreur gdal_polygonize.py package ARfun with R

I'm a french student, in advance I'm sorry for my english. I'm installed the package APfun on R to transform Raster to Polygons with Appolygonize function. But I have a error : crownsPoly <- ...
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2answers
39 views

Two-value raster to generalized polygons (join pixels close together into one polygon) with short computation time in QGIS or ArcMap [closed]

I want to create application map for agriculture based on NDVI map. I have theoretical way how to do it. My raster has two values (1 - red, 0 - green), the raster is quite big (100 hectares with 6 ...
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1answer
44 views

How to create polygons from box type coordinates using ET GeoWizards?

I have a table that has an ID and coordinates for Left, Right, Top, Bottom and I would like to create rectangles out of those coordinates. This rectangles should have around 4 km per side. Using ET ...
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0answers
59 views

Split a polygon every time a new centerline line segment begins?

I'm trying to sample out a road into equal parts. It was easy to do this with a line segment using the split tool because I couldn't figure out a way to break the polygon in the photo every 150ft but ...
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1answer
617 views

Create polygons from points with rectangular buffer in Python [closed]

I want to create rectangular polygons from points. Actually I have a GeoPandas point DataFrame and the distance in X & Y direction to form the polygon. The distances are equal for every point. I ...
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1answer
202 views

Polygon disapears after finishing edit in ArcGIS Pro

I am quite new here and yet I have a big problem. I am working with ArcGIS Pro and I am editing some polygons for a project. The problem I have is that after creating it and (!) finishing it with a ...
4
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1answer
163 views

How to create Polygons of a specific size?

I'm trying to create polygons of specific size in square meters that represent the areas surrounded by roads. The roads are stored in PostGIS as points / lines. If required, I can convert the data to ...
3
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2answers
246 views

Creating precise shapes using list of coordinates?

I am using st_concavehull to create boundaries/shapes. This works, however, the shape is not precisely tracing the coordinates. It is more puffy, as if trying to even out or "clean up" the actual ...
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0answers
124 views

User draw a polygon on a Resium map

Does anyone have an idea of how you could allow the user to draw a polygon on a resium map? Resium is a react library using cesium. I have an app that has entities placed on the map and I'd like to ...
2
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2answers
404 views

Creating or updating geometry polygon column with new point using PostGIS

I have PostgreSQL tables with the following columns: Table (1) | Column | Datatype | | ------------- |:-----------------------:| | group | TEXT | | ...
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2answers
137 views

Automate saving features by results of join attributes by location

In QGIS v3.8.3 I have one shapefile of all US Census Tracts and another of ~1,000 US Counties. There are multiple tracts in a county. So I did a many-to-one join in Join attributes by location to add ...
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1answer
73 views

How to check a polygonal area for diagonal lines?

I currently have an algorithm which turns a polygon drawn on a map into a contiguous set of 100m^2 chunks. Sometimes the algorithm fails and I end up with chunks missing and a diagonal line remains ...
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0answers
214 views

Create new MultiPolygon with PyQGIS

I want to create a new MultiPolygon shapefile, I tried this code Mp_Layer = QgsVectorLayer('MultiPolygon?crs=EPSG:26191', 'layer', 'memory') QgsProject.instance.addMapLayer(Mp_Layer) But when I ...
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1answer
227 views

Exporting data using sketch tool in ArcGIS API for JavaScript

I am looking to see if it possible to extract data from a feature when we use sketch tool. After I draw a polygon it is selected as a feature what can I write to get the data behind that select ...
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0answers
39 views

When exporting shapefile I added polygons to I get an error

I was tasked with updating a map at work and had to add a number of polygons to the layout. I did this by creating features and then just selecting polygon or autocomplete polygon and just drawing ...
1
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1answer
81 views

Making polygons out of X,Y-point groups?

I have (X,Y)-coordinates for different places in a single file. How can I make polygons from a group of points separated by NULL? A common method 'Points to line' does not seem to work. For instance, ...
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0answers
41 views

Convex Hull not outputting expected number of features

I have a .csv file with observations of various species and I want a polygon to illustrate the area where those species occur. I ran the Convex Hull, grouped by the species' names field, which ...
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2answers
56 views

Creating triangles from points with given bearing and leg length using ArcGIS Desktop

I have a spreadsheet that contains ID, LAT_DD, LONG_DD, Bearing and LEN fields. I need to automate a way to create a triangle for every point identified in the table and I have no idea how. I know the ...
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0answers
73 views

Convert polygon co-ordinates to GeoJSON using JavaScript [closed]

I need to convert the below polygon to a GeoJSON object, "Polygon":"146.90805846452713 -42.942663073539734, 147.01517516374588 -42.87627762556076, 147.15525084733963 -42.745309352874756, 147....
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1answer
107 views

Generate concentric polygons using Turf

I'm interested in trying to reproduce this kind of cartography in a Mapbox/Turf/vector tile stack: I would start with the polygon for the lake edge, and generate a series of concentric polygons ...
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3answers
47 views

Copying polygon feature class with 405 features for each matching owner entity?

I have 425 polygon features that I need to duplicate in relationship to 5907 owner entities that are contained inside an excel sheet I converted to a table. So each polygon represents a lease record ...
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0answers
86 views

Coverting TIFF file by Raster Calculator in QGIS

My ultimate goal is same as here Here is my steps: The image is created using Python and saved as PNG format: Import the image into QGIS using Georeferencing tool and saved as TIFF: ...
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0answers
38 views

Automatic geometry creation [duplicate]

I am currently slowly mapping field boundaries of old agriculture map areas using QGIS. Has anyone designed a magic plugin or method so that the black outlines of the boundaries are automatically ...
2
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3answers
301 views

Creation of polygon in the gap between two existing polygons

If there is a gap between two polygons is it possible to fill it? Much like what happens using the hatch function in AutoCAD. The output would be a new polygon in place of the gap.
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1answer
46 views

How do you calculate drive times around a point? [duplicate]

For example, if I have an Airport point and I want to create a 30-minute Drive Times buffer polygon around it, how would I do that? I'm currently using QGIS 3.4.4.
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1answer
61 views

Automatic polygonising in QGIS? [duplicate]

I have multiple points and I need to create polygons that consist specific amount of points. How could i do this?
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1answer
1k views

Draw a polygon with specified edge length in QGIS Madeira

I am looking for a possibiliy to draw a polygon with specified edge length in QGIS Madeira. I already checked further Threads belonging to this question, but all answers refer to PlugIns which are not ...

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