[Gdal-dev] gdalwarp UTM->SPCS

[Richard Greenwood]

Hello;

I am continuing to struggle with gdalwarp. Following up on my earlier query 
to this list - I am trying to reproject from UTM to state plane. My source 
image has a world file, but an incomplete SRS, so I am launching gdalwarp 
with both a s_srs and a t_srs where the s_srs defines my UTM zone, and the 
t_srs defines my state plane zone. Is this generally the right approach?

I have tried specifying both the s_srs and t_srs with EPSG:xxxx, PROJ.4 
declarations, and OGC WTK in text files, but in no case am I getting the 
expected results. For example, in no case does gdalinfo list the correct 
units for my output file. I have specifed 
UNIT["Foot_US",0.30480060960121924] in the t_srs WKT definition and 
+to_meter=0.3048006096012192 and +unit=ft in the proj.4 t_srs definitions, 
but the output always ends up as either 
UNIT["metre",1,AUTHORITY["EPSG","9001"] or UNIT["unknown",1].

I feel like I must be overlooking someting terribly obvious. Where might I 
find more examples of gdalwarp usage? Is there a more appropriate list to 
pose the questions to?

Thanks,
Rich

Richard W. Greenwood, PLS
(307) 733-0203
Rich at GreenwoodMap.com
www.GreenwoodMap.com