Hi Martin, I found a small problem in linear referencing package (JTS 1.13).
If I extract a point at distance 100 on LINESTRING(0 0, 100 0) - I get 100, 0 with extractPoint(100) : test in testbuilder - I get 0, 0 with extractPoint(100, 0) : test through OpenJUMP The result is not the same with the single parameter method and the two parameters method. I think the problem comes from LengthLocationMap#getLocationForward It computes the following LinearLocation (which seems OK so far) getSegmentIndex = 1 (virtual second segment) getSegmentFraction = 0.0 (first point) but in this particular case, LinearLocation#getSegment() returns segment n-1 and not segment n (probably needed to be able to compute offset). To be consistent , returned LinearLocation should probably have segmentIndex = 0 segmentFraction = 1.0 Not sure if the problem is in LengthLocationMap#getLocationForward itself or in LinearIterator#isEndOfLine() which is used by the former and returns false if (componentIndex >= numLines) or maybe I missed the point, thanks for your help Michaël ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60135031&iu=/4140/ostg.clktrk _______________________________________________ Jts-topo-suite-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/jts-topo-suite-user
