[gdal-dev] gdalwarp problem(s)

Hermann Peifer peifer at gmx.eu
Wed Apr 3 17:31:43 PDT 2013


Hi,

gdalinfo 27002570PAS_dem.tif tells me:
...
PARAMETER["false_easting",6458320.416666666],
...
UNIT["us_survey_feet",0.3048006096012192],

gdalwarp 27002570PAS_dem.tif out.tif -t_srs epsg:4326 tells me in DEBUG 
mode:

OGRCT: Source: +proj=lcc +lat_1=40.96666666666667 
+lat_2=39.93333333333333 +lat_0=39.33333333333334 +lon_0=-77.75 
+x_0=1968500 +y_0=0 +datum=NAD83 +units=us-ft +no_defs

My wild guess is that there is something going wrong with the false 
easting value and the metre/feet conversion.

Hermann

On 2013-04-03 15:36, Reynolds, Scott wrote:
> Hi,
>
> I’ve downloaded the file 27002570PAS_dem.zip from
> ftp://pamap.pasda.psu.edu/pamap_lidar/cycle1/DEM/South/2008/20000000/
> and have attempted to warp the data to WGS84 using gdalwarp.  The output
> should be around 75W but is being warped to 91W.  I’m using gdalwarp
> 1.9.2 which was installed as part of OSGeo4W. Any ideas?
>
> Thanks,
>
> Scott
>
>
>
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