> I can see how scaling solves the difference between the units in the two > CRS's but it seems that if CRS1 has all its axes in one unit but CRS2 > has x,y in one unit and z in another then the transform has too few > parameters. I'll grant it's probably a rare issue and therefore academic > from that point of view but I wondered anyhow.
I think you're right. However, I think this only becomes important for 3D CRSes, meaning anything with a 3D CartesianCS. Currently, I think this is limited to GeocentricCRS and EngineeringCRS. I don't think it's legal to do a 3D rotation on a 2D + height CRS, because...well _everything_ is wierd. Horizontal units may be angles, if it is "length", then it's projected, and the projection may not preserve length or area (meaning that volume is not preserved when height is factored in). ...and then you rotate... Bryce ------------------------------------------------------- All the advantages of Linux Managed Hosting--Without the Cost and Risk! Fully trained technicians. The highest number of Red Hat certifications in the hosting industry. Fanatical Support. Click to learn more http://sel.as-us.falkag.net/sel?cmd=lnk&kid=107521&bid=248729&dat=121642 _______________________________________________ Geotools-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-devel
