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I am quite sure there is a function in NTS that actually gets us a point at a distance along a line starting at first vertex. I am using NetTopologySuite version 1.12.1.

In Shapely, the python version of JTS, it is quite simple to use

>>> LineString([(0, 0), (0, 1), (1, 1)]).interpolate(0.75, normalized=True).wkt
'POINT (0.5000000000000000 1.0000000000000000)'

I am trying to do the same thing using NTS but i hightly doubt they could be using a jargon word for this. I tried LinearReferencing namespace, but could not find a suitable method.

Does anyone have idea on this?

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PointAlongSegmentByFraction ? it is in LinearLocation – simplexio Jan 9 '13 at 13:53
@simplexio - would you mind posting this as an answer? – vinayan Jan 10 '13 at 7:00
up vote 2 down vote accepted

PointAlongSegmentByFraction(Coordinate p0, Coordinate p1, double fraction) in LinearLocation.cs

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complete code based on help of @simplexio's answer..

string wkt = "LINESTRING (0 0, 10 0, 20 0)";
WKTReader rdr = new WKTReader();
IGeometry g1 = rdr.Read(wkt);

ILineString lstring = (ILineString)g1;
Coordinate pt1 = lstring.GetCoordinateN(0);
Coordinate pt2 = lstring.GetCoordinateN(lstring.NumPoints - 1);

Coordinate c = LinearLocation.PointAlongSegmentByFraction(pt1,pt2, 0.25);
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