First of all, I am a newbie in GIS.
I have a lidar point cloud with GPS and telemetry data associated. Then, I transform coordinates of every point to an ECEF coordinate system and finally I transform the angular coordinates to a cartesian coordinate system, using the Local Tangent Plane (LTP) approximation. (This approximation uses the gps coordinates of first point as a reference system origin and then, reference the rest of points in respect with the first).
I am writing the LAS file using liblas, and I don't really know how to set the georeference information to the LAS file. I am writing the coordinates of every point in the LTP approximation so I have 2 questions:
Is it correct to write the points coordinates in respect to the LTP approximation or should I write coordinates in lat/lon (gps) units?. If this is correct, how can I set the georeferencing respect the LTP?.
If '1' is not correct and I must write the coordinates in lat/lon units, how can I set the georeferencing? Is writing an VLR with WGS84 value enough?