I have a geotiff in State Plane 83, Michigan Central, *Feet*. It was
originally generated from Photoshop, then georeferenced in Arc, years
ago.
The projection in the geotiff is specified as EPSG:26989 + units:feet.
PROJCS["NAD83 / Michigan Central",
GEOGCS["NAD83",
DATUM["North_American_Datum_1983",
SPHEROID["GRS 1980",6378137,298.2572221010002,
AUTHORITY["EPSG","7019"]],
AUTHORITY["EPSG","6269"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4269"]],
PROJECTION["Lambert_Conformal_Conic_2SP"],
PARAMETER["standard_parallel_1",45.7],
PARAMETER["standard_parallel_2",44.18333333333333],
PARAMETER["latitude_of_origin",43.31666666666667],
PARAMETER["central_meridian",-84.36666666666666],
PARAMETER["false_easting",19685000],
PARAMETER["false_northing",0],
UNIT["US survey foot",0.3048006096012192,
AUTHORITY["EPSG","9003"]],
AUTHORITY["EPSG","26989"]]
This image projects fine with gdalwarp.
I had to do some processing on it in Photoshop, which detroys the
projection data. So I decided to assign it EPSG:2252 - Michigan is
one of the few states that has an NAD83/feet EPSG code. So:
gdal_translate -a_srs EPSG:2252 myimage.tif georefimage.tif
ERROR 1: Unable to compute a transformation between pixel/line
and georeferenced coordinates for myimage.tif.
There is no affine transformation and no GCPs.
same with gdalwarp -s_srs EPSG:2252 -t-srs ....
Maybe I'm missing something? proj and cs2cs handle the EPSG code fine.
Maybe it's a bug? If I simply convert the original image to the same
format:
gdal_translate srcimage.tif newimage.tif
then try to warp that:
gdalwarp -t_srs EPSG:26917 newimage.tif projimage.tif
same error (for newimage.tif). gdalinfo reports the same projection
info (ie EPSG:26989 + units:feet) in newimage.tif as the original,
minus the comments added by Arc. So it doesn't seem to be the EPSG:
2252 code...
This happens in all 1.5.x, and 1.6.0 (I dug up old 1.5.x versions to
try it). It worked in 1.5.0 back in Feb.
-----
William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
http://www.kyngchaos.com/
"The beast is actively interested only in now, and, as it is always
now and always shall be, there is an eternity of time for the
accomplishment of objects."
- the wisdom of Tarzan
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