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Questions tagged [circle]

A circle is a simple shape of Euclidean geometry that is the set of all points in a plane that are a given distance from a given point, the centre.

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1 answer
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Where to place the poles on a map of the Earth, where polar circles are not straight lines?

Consider this question, that was part of an evaluation that my daughter had in school: The underlined question translates to "draw a green dot at the north pole and the south pole". I think ...
Mathieu's user avatar
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0 votes
1 answer
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Can GeoTools parse GML geodetic shapes?

I am trying to parse different GML definitions, according to the geodetic shapes defined in RFC-5491. Points and polygons are parsed OK with GeoTools parser: Configuration configuration = new ...
llmarti's user avatar
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0 answers
29 views

QGIS 3.30 organize labels with callouts for point-features in a circle around the map center

My hope is to get labels with callouts for a point-layer spreading towards the edges of the canvas. I thought about make_line ( $geometry, closest_point ( overlay_nearest (make_circle( ...
René's user avatar
  • 1
1 vote
0 answers
136 views

Finding the Minimum Bounding Circle [closed]

I am trying to find the Minimum Bounding Circle for a given state in the US. To do so I am using GeoPandas minimum_bounding_circle function The result returns a Polygon, however, I would like to find ...
gbox's user avatar
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0 answers
18 views

Map location of unknown point coordinates with two known coordinates and distances between them [duplicate]

I have a problem where I need to find the coordinates of a point which is the intersecting point of two circles. I found a similar question on stackoverflow. I understood to some extent, but not able ...
Sid's user avatar
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2 votes
1 answer
243 views

Cutting circle into polygon in OpenLayers?

I have a square polygon and I want to cut circles into it where I click with the mouse. The result should be a new polygon with holes in it. This is my attempt so far but I can't get it to work. The ...
nanobot's user avatar
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0 votes
1 answer
111 views

Limiting Voronoi polygons with circles

Using the following: Layer 1: Voronoi polygons Layer 2: Circles buffer for each points, polygons When I Cut/Intersect in QGIS, here is what I can get as results. This is ALMOST what I want. The ...
Pierre-Luc Turgeon's user avatar
0 votes
1 answer
105 views

Creating a 500m circle centred on a coordinate in OpenLayers

All I want to do is create a 500m circle around One Tree Hill in Auckland New Zealand, but nothing works for me. The codes I've tried seem to run, I've specified huge radii to check to see if the ...
Anthony Avengerland's user avatar
1 vote
0 answers
141 views

QGIS Buffer tool and Shape Tools circle size does not match

I am trying to create a circle polygon around a point so that I can count population from a raster grid inside that circle. I know this has been well-covered in other posts, and I've managed to do it, ...
evalski's user avatar
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4 votes
2 answers
185 views

Determining the centre of a larger number of arc segments using QGIS

I am using QGIS. I have a larger data set of circles (different radii) that partially overlap and are intersected with each other (see screenshot below). I am now looking for a way to determine the ...
Hauke Moehl's user avatar
1 vote
1 answer
739 views

Drawing circle of known radius to scale on ArcMap

How do you draw a circle with a known radius (ex: 1 meter) to scale in ArcMap 10.8? I have used the draw tool, but a circle with a radius of 1 meter drawn with the draw tool is not to scale.
Programmer888's user avatar
0 votes
0 answers
32 views

QGIS 3 and Python : How to draw a circle with radius and center [duplicate]

I read how to draw a Polyline, but I did not find anything to draw a Circle with radius at a defined position (centre) #Drawing Polyline polyline = QgsRubberBand(canvas, False) # False = not a ...
Gab74's user avatar
  • 31
9 votes
3 answers
379 views

Maximisation of circles that don't intersect other geometries within a given layer using QGIS

My context is an orchard in which certain trees already exist. I want to plant new trees that have to be at 10m from any other trees and from the border of the orchard. The grey points in the image ...
jo.H's user avatar
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1 vote
1 answer
853 views

PostGIS: get Circle to GeoJSON

CREATE TABLE IF NOT EXISTS public.global_circles ( name character varying(64), geom circle); INSERT INTO global_circles (name, geom) VALUES ('My circle', CIRCLE(POINT(16.56115880637268,46....
Koba's user avatar
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0 votes
0 answers
73 views

Clipping a point cloud into a circular one with a defined radius

I am trying to crop a pointcloud into a circle with a radius of 15m. I tried subplot = clip_circle(ctg,x,y,radius), but didn't work. How can I can clip it easily in R?
KRT's user avatar
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0 votes
0 answers
902 views

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 ...
ni5arg's user avatar
  • 1
5 votes
3 answers
2k 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 ...
LT17's user avatar
  • 303
7 votes
2 answers
711 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 ...
Erik's user avatar
  • 73
2 votes
2 answers
386 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?
Romano Gino Segrado Pavón's user avatar
3 votes
1 answer
172 views

Copying template of circles and putting them on new position by mouse click

I am looking for a way to copy some circles (see at picture) and put them on a new position by a mouse click. Most likely I would like to copy the circle with the different color of lines but the one ...
lesto's user avatar
  • 327
0 votes
1 answer
759 views

Circling area on map / drawing a circle on a map

I'm trying to find a map of the US East coast, with cities, that I can draw a circle, say of 150mi radius, so I can plan a road trip from my hometown. As far as I can tell, I can't do this on Google ...
Kevin's user avatar
  • 9
1 vote
1 answer
2k views

Leaflet Circle Rendering as Marker

I'm trying to create a map with circles of different size radii, to this end I'm trying to use the Leaflet circle class. The issue I'm having is that despite specifying circle and passing a radius the ...
Ayrton Bourn's user avatar
3 votes
0 answers
361 views

QGIS - Add a circle from 2 points is not creating a circle

I am trying to create a circle from two points when editing a layer. When I begin to add the 2 points it looks like a circle, but as soon as I right click to add the feature it changes shape as shown ...
Tangaroa79's user avatar
4 votes
4 answers
2k views

Creating circle around point with size relative to field attribute in QGIS [duplicate]

I'm using QGIS to create tree surveys. When I return to the office and download my tree points into QGIS I would like to create an expression that uses the "DBH" (a field collected numerical ...
Adam Walters's user avatar
0 votes
1 answer
3k views

Generating approximate polygon for circle with given radius and centre (without using shapely) [closed]

I am given center and radius (in km), I want to generate coordinates for the circle. Every example on GIS.SE uses Shapely. Is there any way to do it in python without using Shapely?
Tarik Setia's user avatar
2 votes
1 answer
852 views

OpenLayers : intersect between polygon and circle not accurate

When I look for intersect between circle and polygon. He finds intersect between these two, who are not visually intersected. Everything should have the same projection ('EPSG:3857'). But I don't know ...
Thomas Vanneuville's user avatar
1 vote
1 answer
614 views

Generate polygon shaped as a circle if projected using Web Mercator, in Python?

I need to solve problem very similar to Generating polygon representing rough 100km circle around latitude/longitude point using Python? but subtly different. I need a shape that will be a circle once ...
reducing activity's user avatar
-2 votes
1 answer
271 views

Drawing circle using QGIS

I want to draw a circle with 1 centerpoint and the radius, or with 3 points. I am using QGIS 3.10 and EPSG 25832
Rick's user avatar
  • 17
1 vote
1 answer
395 views

Modify circle but don't allow to change center in OpenLayers

I have a Circle on my map with the following modify code: var modify = new Modify({ source: this.getRadiusLayer().getSource(), wrapX: true, style: new Style({ ...
quikina's user avatar
  • 13
3 votes
2 answers
1k views

Draw circles around points

I have a CSV layer of points which I have succesfully imported into QGIS. My assets are a bit like wireless access points and I cannot have any of the points on the same channel within 2km. I ...
David I's user avatar
  • 51
2 votes
1 answer
375 views

How to set the number of vertices by shape digitizing tool in QGIS 3?

Can we set the number of vertices of the created circle or ellipse. (e.g. a circle/ellipse with 24 or 36 vertices) I can use "add regular polygon and set the point #" for circle, but i don't ...
donkeychen's user avatar
5 votes
1 answer
854 views

Using QGIS to draw a line tangential to an existing circle and parallel to existing lines

I am trying to draw a line tangential to a circle and parallel to an existing line. I have drawn the rough shape below showing the lines I need to draw as dashed lines. Using the advanced ...
Geotern's user avatar
  • 137
10 votes
1 answer
573 views

Splitting a polygon into circles

I’m fairly new to QGIS. I have a polygon that I need to split up into circles. I have the following requirements: I must be able to specify the radius for these circles, for example 2 km, so that ...
YoungGun's user avatar
  • 113
3 votes
2 answers
5k views

Creating circle polygon of certain radius around points in QGIS

I have a point layer in QGIS in EPSG:4326 and want to create polygon-circles of 10m radius around each point. All of the points are located within a kilometer² in northern Germany. How do I do this? ...
Chris's user avatar
  • 31
1 vote
1 answer
759 views

Fully cover polygon with circles of fixed radius? [closed]

I have some detailed polygons I want to cover by generating points buffered to 4km radius. How do I determine the best way (or even a decent) way of covering the polygons completely with minimal ...
Ben Hendel's user avatar
5 votes
1 answer
2k views

Measuring compactness in Python [closed]

I have set of polygons whom I would like to check their compactness. I'm working in Jupyter Notebook and my geometry is GeoPandas. I would like to try Polsby-Popper test and Schwartzberg test (and ...
ReutKeller's user avatar
  • 2,169
3 votes
2 answers
822 views

Circular clipper in QGIS

In QGIS 3.14 I wish to clip a layer to the features within a circular area. Can this be done?
Bill C's user avatar
  • 987
1 vote
0 answers
81 views

Create an outline based on density of raster

I have a classified aerial image of small vegetation that is separated enough by ground that it is not overlapping each other. After the classification process (dzetsaka), I removed all the other ...
Binx's user avatar
  • 1,380
3 votes
1 answer
539 views

Raster brick from raster masks by sectors (R)

The goal is to divide a raster file into quadrants in order to make some computation in each. I'd like to split the raster and create a raster brick with those parts. I don't need to get perfect clips ...
César Arquero Cabral's user avatar
8 votes
1 answer
635 views

How to produce opposite semicircle maps in CARTO or QGIS?

I need to produce a map of opposite semicircles or concentric circles to represent two numerical columns on the same map simultaneously. I have already tried to create a layer for each column's data ...
Clarissa Bonvent's user avatar
2 votes
1 answer
130 views

Removing segment from circle?

I have drawn a vector circle with "Add circle from 2 points". How do I remove a segment of this circle? In essence, I want to edit a circle and convert it into an arc.
Anand Bariya's user avatar
0 votes
0 answers
116 views

GeoServer PointSymbolizer graphic artifact when zoomed

I'm using GeoServer 2.14.0, I created a red circle using PointSymbolizer with size=35. But in some cases, the map shows this artifact when I zoom in: Basically the map still shows parts of the circle ...
Federico Oldani's user avatar
2 votes
1 answer
382 views

Circle around all points of a layer

I want to draw a single circle which includes all points in a layer, but is as small as possible (so the two outermost points are exactly at the line). Is there any way to do this in QGIS (3.4) or ...
Keep.cool's user avatar
1 vote
0 answers
53 views

PostGIS ST_Point_Inside_Circle radius unit [duplicate]

I'm trying to use the ST_Point_Inside_Circle function from PostGIS but I'm not sure about the unit the radius is stored. Let's say I have a table with the following points: Id | Point 1 | ...
aibars's user avatar
  • 51
1 vote
0 answers
710 views

Fixed distance buffer is oval in QGIS?

I want to create circles of diameter 20m in QGIS. I create a point and then use vector - geoprocessing tools - fixed distance buffer. My problem is that the size is crazy and worse, the shape is not a ...
Steve Bolsover's user avatar
2 votes
2 answers
186 views

Got Pacman instead of circle when buffering point QGIS 2.14 standalone C++ application

QgsVectorLayer *circleLayer = new QgsVectorLayer("Polygon", "Circle", "memory"); QgsFeature circleFeature = QgsFeature(); circleFeature.setGeometry(QgsGeometry::fromPoint(geometryPoint)->buffer(...
Wolf Schulz's user avatar
0 votes
0 answers
217 views

How to cover data by circles, limited by a maximum of values?

I have a regular grid with a cell width of 200 meters (available as raster and vector data set). Each cell has a value from 0 to 2000. I now want to draw circles around these cells in such a way ...
Martin Weber's user avatar
3 votes
3 answers
922 views

QGIS3 Shape Digitizing Circles is Drawing Improperly

I'm trying to draw a circle in QGIS 3 with the shape digitizing toolbar. I've tried several of the "add circle" options and they all look normal while drawing, but once I click to finish the shape it ...
Jesse Lawrence's user avatar
2 votes
0 answers
2k views

Finding center of circle given three points?

I have been trying to solve this problem for quite some time, but can't find a good solution. Given three sets of geographic coordinates how can I calculate the center point. By "center point&...
Tom's user avatar
  • 121
3 votes
1 answer
453 views

Circle turns into ellipse after converting it into raster in ArcGIS Pro?

I have a polygon layer that contains a circle and an irregular polygon and I want to convert it into a raster in ArcGIS Pro. When I do that, the result is a raster containing the irregular polygon and ...
MJA's user avatar
  • 83