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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2answers
57 views
Create a circle or ellipse from points
Sorry if this is basic. I have an excel sheet with lat/long in it and a field with a radius, in meters, included. I would like to create a circle or ellipse feature class around these points. ...
7
votes
3answers
164 views
maximum circle inside an irregular polygon from a random point
I am trying to work out an algorithm for creating the maximum radius circle within an irregular polygon (a census tract) based on a given center of the circle.
The motivation for this is to obscure ...
4
votes
1answer
64 views
Error in Min. Bounding Geometry results
I'm getting consistent, weird results from using Minimum Bounding Geometry to make circle polygons. I'm not sure if a datum issue, but I'm leaning more towards something wrong with Minimum Bounding ...
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vote
1answer
52 views
How to get routes in the database that intersects circle?
I have routes (linestrings) recorded in the database. I want to create a query which returns the routes that have some commonality with a circle whose center and radius are passed as parameter.
I ...
2
votes
2answers
77 views
How can I do a batch edit of circle diameters using the attribute table in ArcGIS?
I need to edit the diameter of a bunch of circles to reflect their correct diameters, and I wondered if there was a way of drawing from the attribute table to make all the circles equal their correct ...
3
votes
3answers
203 views
Summing attributes intersected by under a radius
Apologies - new user.
I am working with QGIS on Mac OS X and with shapefiles downloaded from the US Census Bureau that show population data by state and by county.
How do I:
select certain points ...
2
votes
0answers
81 views
How to identify each circles in Google Maps API?
By the Google Maps Drawing API, I can create lot of circle and other shapes. addListner method helps to get the radius, latitude and longitude of the circle. Now I want to identify each circle for ...
2
votes
2answers
663 views
Calculate dynamic radius based on population and map resolution
Background
Create a radius around the centre of a city that corresponds to the city's population, taking into consideration the map's current resolution. The populations range from 39 to 1090936, ...
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vote
2answers
1k views
How to draw a Circle with a set radius?
I have a site and want to draw an indicative line in a 5km buffer around the centre of the site. So I want to draw a circle with a radius of 5km. I have a tool for drawing circles and ellipses and ...
2
votes
2answers
645 views
How to change the vertex style for editing?
When I use drag feature, then the circles on the polygon edge has the same style.
For example, this OpenLayers site.
I need to change it, I mean they need to be a different color.
What is their ...
1
vote
2answers
559 views
OpenLayers Circle not visible
I'm trying to draw a circle with OpenLayers with a Google Maps Layer. I'm able to transform a simple marker and have it draw at the correct location, but I can't figure out the circle. I'm trying to ...
3
votes
2answers
414 views
How do I find the points of intersection between a small circle and a great circle?
I only actually need to intersect a great circle arc i.e. the shortest path between two points, with a given small circle.
I found this tutorial for intersecting two great circle arcs, but ...
5
votes
1answer
164 views
Intermediate points on a small circle
I need to interpolate lat/lon points along a small circle, with a given centre and radius. I've successfully used these formulas for great circles. What is the equivalent for small circles?
3
votes
2answers
1k views
find location details within circle buffer
Wondering how would i go about getting this to work.
I have a table with location data (lat, long, homevalue) in sql server 2008. Given a lat long say (32.113, -81.3225), i want to draw a 50 mile ...
2
votes
1answer
911 views
Transform polygon to equivalent circle, QGis
I have a polygon and I'd like to find the radius of an equivalent circle from a particular point within the polygon. The polygon would have a large (infinite) number of points evenly distributed ...
1
vote
1answer
445 views
Circle features missing in PostGIS after import from ArcGIS using ogr2ogr
I have a ArcGIS feature class of geometry type polygon. It was created as a convex hull with a 200 meter buffer on a point dataset, aggregating rows on a particular field. The number of points used to ...
4
votes
1answer
338 views
How to deal with direction (CW, CCW) of circles, in particular with shapely?
I am translating an input that describes zones by mixing segments and arcs. Arcs are given by a center, 2 points (beginning/end of arc) and a direction (CW or CCW). In a first prototypes using GDAL, I ...
5
votes
3answers
1k views
How to create a circle in arcpy
Suppose I have a dataset where each record has an x,y and r (the centroid and radius of a circle). How can I create a polygon feature class containing parametric circles?
Sorry to those who have a ...
3
votes
2answers
3k views
Drawing circles on map using openlayers
I want to draw circles of certain radius on a map using openlayers . But the latitude,longitude & radius values are given in a excel sheet. I badly need a help from you people to how to carry in ...
2
votes
4answers
342 views
How to create a circle with ArcEngine?
I want to create a circle with IPoint P and radius r in ArcEngine and then I need to cast it to an IGeometry. Does anyone know how to do this?
ESRI ArcEngine 10 VS2010 C#
