[Proj] Local cartesian to UTM using PROJ.4
gdt at ir.bbn.com
Tue May 15 14:42:52 EDT 2007
Frode Tennebø <frode at tennebo.com> writes:
> I'm trying to perform a transformation of a position in a local
> carteisan system, grid north in meters (XYZ) relative to a UTM/WGS84
> (ENA) center with the result in UTM/WGS84. I have tried Geotrans
> (Local cartesian -> UTM, WGE/ WGS84), but have discovered some
> discrepancies. I would like to use PROJ.4 to verify one or the other.
> How can this be done in PROJ.4?
I had a similar problem, I think. I defined a local system relative to
Massachusetts state plane, putting (40,30) in my grid at some SPC
coordinates. Then I had a rotation - my Y axis was more or less north,
but not really. (The point was to have a natural coordinate system in a
I tried to do this in proj by using the oblique mercator projection, but
never succeeded. I ended up hand-writing the code, since it was just a
rotation and translation from the state plane system.
Rereading your question: are your X and Y axes along the ellipsoid, or
is this a translation of an ECEF system? I think it would be helpful
for you to be far more precise about what you are doing.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 185 bytes
Desc: not available
Url : http://lists.maptools.org/pipermail/proj/attachments/20070515/b101d81b/attachment.bin
More information about the Proj