Solved! Go to Solution.
The length of the polyline depends on the coordinate system distortion. The length reported is the length in that coordinate system with distortion, not the length along a geodetic great circle. Use the wrong coordinate system a path of 200kM becomes 300... Assuming the distance is large enough to make a difference, to get real length you nee a geodesic operation. IGeoPolyline exists in 10.1 as part of defenseSolutions library. The polyline has a ISegmentCollention interface which has an enumSegments. Segments have a from and to point...
Maybe I'm missing something but IPolyline has a Length property that returns the length of the line. Is this not what you're looking for?
The documentation for Polyline only lists a ton of interfaces. It does not show a property of length in the SDK! And since we are under a tight schedule I do not want to write a ton of code only to find I've gone down a wrong path. So lot's of questions at this moment.