[GIS] Create a closed polygon from a series of edges given a point

csharpmap

I have a series of points fed into a voronoi graph class that returns a series of edges defining the bounds between these points, the process works it returns a series of edges.

I now need to do a ray/fill using the points and these edges to build polygons around each point…. for the life of me I can't seem to figure out a process of doing this or a code sample…
C# code or thought process would be great …. maybe ray collision?

Sample Voroni

Best Answer

How about PolygonBuilder in nettopologysuite

NetTopologySuite is a C#/.NET port of JTS Topology Suite, a Java library for GIS operations, (OpenGIS compliant).

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[GIS] How to create polygon with DBGeography Class in Csharp

The DbGeography uses well known text when creating from text

Your last try was almost correct, was missing a '( )' and more points to create an actual polygon, it should be:

System.Data.Spatial.DbGeography.PolygonFromText("POLYGON((127.652 -26.244,127.652 -26.194,[some other points],127.652 -26.244))", 4326);

Notice the 2 '(' at each side.
Remember that it is Longitude,Latitude and not the other way around like all other places..
You must 'close off' the polygon, which means the start point and end point need to be the same

[GIS] How two add line from point A to B

The CreateLineString method only takes one argument - an array of Coordinate (strictly speaking an IEnumerable<ICoordinate> or an ICoordinateSequence). You can see this in the examples:

//Add a LineString with 2 Points
GeoAPI.Geometries.Coordinate[] points = new GeoAPI.Geometries.Coordinate 
    {
        new GeoAPI.Geometries.Coordinate(10, 10), 
        new GeoAPI.Geometries.Coordinate(20, 20), 
    };

geomColl.Add(gf.CreateLineString(points));

Note that there are some API differences across versions, so next time, posting exact version information might be useful.

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[GIS] How to create polygon with DBGeography Class in Csharp

[GIS] How two add line from point A to B

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