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Questions tagged [polygon-creation]

Process of creating geometric polygon features.

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1 answer
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Drawing rectangle of road line with width as minimum distance between two buildings in QGIS

I have two layers: line vector layer representing the road polygon vector layer representing the buildings How can I derive a rectangle shape (refer to green rectangle) for each road line whereby ...
LBL's user avatar
  • 31
2 votes
1 answer
65 views

Segmentation fault on ST_ConcaveHull call [closed]

I have a problem on creating a polygon for a geometry by using the ST_ConcaveHull algorithm. Following line geometry creates a segmentation fault and breaks the connection to my Java application. ...
Bora's user avatar
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0 votes
2 answers
61 views

Creating rings with buffer as polygon in QGIS [duplicate]

I need to draw circles with a buffer in one view. It will be an area around cities. I think it can be solved with a buffer or a cutout from the circle. How can I do this?
Marek Drličiak's user avatar
0 votes
0 answers
28 views

Creating two connected arcs

I am using a 2D mapping application and I want to create a shape like this on the map: where the red arc and blue arc would be two separate arcs that I need to create and connect them. Here is the ...
pfinferno's user avatar
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0 answers
25 views

QGIS snapping issues - newly created feature not visible

I have just used the snapping tool to create a new polygon feature in one vector layer, based on a polygon feature in another vector layer. I have managed to create features, but I can't see or select ...
user197410's user avatar
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-...
guul66's user avatar
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0 votes
0 answers
46 views

Creating non-overlapping boundary polygons with point attributes

I have a set of points that represent the meter locations for my electric company. These points contain a 3 digit code that represents the route number for the meter reader routes. I also have a ...
user238803's user avatar
2 votes
3 answers
158 views

Creating polygon from vertices with QGIS Geometry Generator

I have a point shape with the following structure: What I want is to know if I can draw the polygons through the QGIS geometry generator. The separator of the polygons of another is in the "NO&...
Gab De's user avatar
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1 vote
1 answer
67 views

Automatically generate surrounding polygon involving multiple polygons from a layer in QGIS

I'm using QGIS to draw a polygon around a city neighborhood where the boundaries of that neighborhood will be the back of lots or streets. I merged streets and lots into one layer, now I need to draw ...
Kledson Lemes's user avatar
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 ...
Artūrs Katamadze's user avatar
2 votes
0 answers
92 views

Create bounding box polygon from extent of point features in PostgreSQL

I have a linestring table (table a) and a point table (table b). What I want is to extract the start points from the features in the linestring table and union them with the point features in the ...
kwiwe's user avatar
  • 409
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.
user237394's user avatar
2 votes
3 answers
470 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 ...
Madeline Cox's user avatar
4 votes
1 answer
99 views

Dynamically drawing the polygon formed by nearest points to @map_extent_center in QGIS

From a DEM raster layer I created a set of random points and informed each point with the value of 'ELEVATION'. I also used the following expression to connect the 10 points closest to the @...
Ingrid Ingravida's user avatar
0 votes
0 answers
30 views

Polygon shape based on attributes (QGIS)

I'm using the "Select by Location" to select features from one layer, based on a polygon in another layer. It' working just fine. Is it possible to create polygons (cones / point of view) ...
skuumm's user avatar
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2 votes
2 answers
185 views

Fixing holes in the buffered polygon using PyQGIS

My script uses a buffer and dissolves to create polygons around my points. However, there are holes in between the points. I do not want to increase the distance because then it will also cover the ...
charliey's user avatar
  • 163
4 votes
1 answer
296 views

Shapely "TypeError: 'LineString' object is not iterable" when creating polygon with interior ring that touches the exterior ring

I am using shapely Python package in order to create polygon from several connected lines. My code worked with a simple polygon, but failed when the polygon to be created had interior ring that ...
ABC's user avatar
  • 351
4 votes
3 answers
173 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 ...
Alex_P's user avatar
  • 81
0 votes
0 answers
51 views

Automatically adding polygons at door openings using ArcGIS Pro

I'm seeking a way to add windows and doors automatically to thier places using ArcGIS Pro, the door or the window is represented as a simple 4 sided polygon, and the added polygons should be on a ...
Motasem Jamal's user avatar
11 votes
2 answers
303 views

Creating buffers to closest distances with two categories in QGIS

I would like to develop an expression that does the following nearest-neighbour analysis: From a layer of points 'point_layer', I would like to calculate for each point the distance to the nearest ...
Ingrid Ingravida's user avatar
2 votes
1 answer
114 views

Splitting polygon based on number of points in it using ArcGIS Pro

Based on the mock-up below, is it possible to split a polygon into multiple polygons depending on the number of points that are within that polygon? I am using ArcGIS Pro 3.1.1. I know there is a ...
Arthur_Morgan's user avatar
4 votes
1 answer
172 views

Creating series of multiple Concave hulls at certain distance in QGIS

Starting from a layer with point geometry, I apply the following function that creates the concaves polygon for each group of points of an attribute field ("class"): concave_hull( ...
Ingrid Ingravida's user avatar
3 votes
1 answer
163 views

Creating buffer for MultiPolygon that covers all its surroundings in QGIS

When I try to use the Buffer tool in QGIS, it only allows me to create buffers in degrees ("grados" in the screenshot below) and it does not give me the option of changing the units (to ...
Felicia's user avatar
  • 31
1 vote
0 answers
87 views

How QGIS's "Remove duplicate nodes" actually works

I am working on digitizing a large number of polygons using stream digitizing, which sometimes creates duplicate nodes. I noticed that in "Layer Properties>Digitizing>Automatic Fixes" ...
Tkerr1's user avatar
  • 11
1 vote
0 answers
32 views

Edge holes created from ArcPy script

I'm working on creating floodplain polygons from Base Level Engineering Depth grids. When running this script I end up with holes that don't get filled in on the edges, as circled in red in the image ...
Tebetheia's user avatar
8 votes
1 answer
125 views

Converting set of points to ellipses with support for overlay_nearest grouping and field filters using QGIS expression

I am trying to build an expression that transforms in real-time using the Geometry generator the geometry from points to ellipses. The expression I am working with is the following: oriented_bbox( ...
Ingrid Ingravida's user avatar
0 votes
0 answers
150 views

Feature to Polygon in ArcGIS Pro: attribute missing although Preserve attributes is checked and feature labels are provided

I try to follow the suggestion given in an equal case in ArcGIS Desktop, however, I do not end up with the desired result. I start with the Shapefile Feature Class lgm_3_contour_edit.shp of Geometry ...
stonebe's user avatar
  • 467
0 votes
1 answer
41 views

How to avoid overlap when working with the habitats baseline map layer on QGIS?

I have recently been working with Natural England's Net Gain Habitat mapping QGIS software. I have plotted baseline habitats, filling out the proposed habitat too. In my previous experience of QGIS I ...
Taylor's user avatar
  • 1
5 votes
1 answer
319 views

Splitting features if composed of spatially separated parts in QGIS

I have a very messy shapefile where some of the features are composed of many separate parts (spatially) but classed as one feature. I need to delete all the tiny slivers but can't do this when they ...
user3390486's user avatar
1 vote
0 answers
102 views

How many coordinate pairs POLYGON(()) needs in QGIS

I have a .csv file containing a POLYGON(())). For years I have been using 5 pairs of coordinates to draw a 4 sided polygon; the first and last being the same to 'close' the shape. That idea is based ...
WillH's user avatar
  • 455
3 votes
1 answer
388 views

Self union MultiPolygon layer using GeoPandas

I need to perform a union operation inside a single layer. In QGIS there is an option not to select the second layer, but I can't figure out how to do it in GeoPandas? Example: Plots are red, zones ...
Sergey47's user avatar
3 votes
2 answers
312 views

Splitting complex polygon in QGIS

I have a problem with a polygon in QGIS. Is a polygon that represents all street areas in a city: And I want to slip all the area into smaller areas that represent the area of each street in the city,...
Daniel Miranda's user avatar
1 vote
0 answers
100 views

Create polygons with fixed size along lines or another polygon

My task is to create layouts for the grey polygon with a rectangle covering multiple parts for the map extend. I then have to calculate the area of they grey polygon within each rectangle. My idea was ...
ibdmn's user avatar
  • 191
1 vote
1 answer
91 views

Creating polygon along highways in QGIS

In QGIS 3.30.1 I would like to create a polygon that shows an area of 200 meters on each side of a highway. I already have a shapefile of the entire highway network of Germany but they are just lines. ...
Thomas Schindler's user avatar
3 votes
1 answer
171 views

Dividing city into blocks (polygons) in QGIS

I'm interested in dividing a city up into distinct blocks, with the end result being polygons for the blocks. I have a polygon for the city boundary and centerlines for the city streets. Here's a ...
GDog's user avatar
  • 229
10 votes
1 answer
142 views

Merging layers and excluding some of the products in QGIS

When merging two layers of polygons so that they produce a third layer where no polygon contains another polygon, I find that the product contains some very small polygons, almost too small to see. ...
Lee Goddard's user avatar
6 votes
3 answers
573 views

Creating buffers in meters for locations around the world using Python

I have a location dataset (points long & lat) for events that happened around the World. I want to create 5km rings around these locations using Geopandas.buffer function. Following in a previous ...
virginia's user avatar
0 votes
1 answer
101 views

QGIS shutting down when trying to create a polygon

QGIS keeps shutting down when I try to create a polygon. It only happens with polygons, not with lines, and only when I try to create a new one, while it works fine if I try to modify the nodes of an ...
Elisa's user avatar
  • 11
4 votes
1 answer
170 views

Computing parallel polygons based on given perpendicular distance in GeoPandas

Say I have a GeoPandas GeoDataFrame of polygons (i.e. the "geometry" column contains polygons of GPS coordinates only). import geopandas as gpd from shapely.geometry import Polygon ...
Tristan Tran's user avatar
6 votes
2 answers
290 views

Applying Geometry Generator for MultiPoint feature in QGIS

I have used the Geometry Generator in QGIS to successfully create a polygon around a point that represents the canopy of a tree based on the cardinal direction recordings. What I cannot figure out or ...
Nathan's user avatar
  • 157
1 vote
2 answers
480 views

Uneven polygon from points with sf package [R]

I have created a group of polygons from a data frame with that code : P <- P %>% st_as_sf(coords = c("lon", "lat"), crs = 31370) %>% dplyr::...
C. Guff's user avatar
  • 265
0 votes
1 answer
262 views

Buffer a polyline by variable distance [closed]

I have a list of points (x,y) that constitute a polyline, each point also has a value (v). I want a polygon which is the buffer of the polyline with variable distance v. So at each point, the polygon ...
Victor Savenije's user avatar
6 votes
1 answer
135 views

Detect largest area and generates polygons that arise from lines geometry

Starting from a layer with points geometry, the Geometry generator is used to create a line geometry layer that connects with the 8 nearest points. The function used is the following: ...
Acperience's user avatar
  • 1,142
4 votes
1 answer
83 views

Representing points as polygons from Feflow data in QGIS

I have several Feflow files that are displayed as points in QGIS. I would like to display points that have the same value scale as a polygon (F Value in the attribute table). Is this possible? Is ...
Jana Dietl's user avatar
0 votes
0 answers
28 views

Plugin where one can make shapefile (polygon) with help of coordinate values [duplicate]

Is there any plugins or method where one can easily make shapefile (polygon) with the help of coordinate values? You can find in the attached file.
Hasan's user avatar
  • 55
0 votes
0 answers
226 views

How to draw polygons in python (giving coordinates) and number its edges?

I have a list of agroforestry plots (polygons) in python. Every polygon is represented as latitude/longitude. polygon1_coords = [ (11.946898956, -86.109286248), (11.947196373, -86.109159886), ...
Ernesto Ruiz's user avatar
-1 votes
1 answer
197 views

Creating Bounding Box in QGIS [closed]

I have four coordinates: north, south, east and west. How can I automatically create a bounding box in my shapefile? Can I do it through Python?
Aryan Irani's user avatar
7 votes
1 answer
465 views

Splitting line buffers into two separate polygons in QGIS

In QGIS, I have a layer of numerous vector lines that need to be buffered. Once they've been buffered, I'd like to have those polygons split into two, with the original line being the segment that ...
JohnnyJohnson's user avatar
1 vote
1 answer
127 views

Improving use of QGIS GDAL Contour Polygon function

I'm trying to extract vector contour polygons from a DEM, but it always takes a long time. While the Line function can finish the DEM in an hour at most, with the same parameters, the Polygon function ...
Richie Tozier's user avatar
3 votes
1 answer
512 views

Getting the polygons contained in closed MultiLinestring using Python

Given a set of "streets", how can I get the "blocks" contained in those streets? For example, I'd like to extract four blocks / polygons from this 2 x 2 "checkerboard": ...
zadrozny's user avatar
  • 318

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