[gdal-dev] GeoPDF offsets from actual location after gdalwarp

Gane R gane.prog at gmail.com
Wed Nov 18 10:42:30 PST 2015


Here is link to a GeoPDF (
https://drive.google.com/file/d/0B4shTM1bPS5TMmk2OWxuTGJpY1k/view?usp=sharing)
this has a mile offset from the current location,
on GDAL gdal-2.0.1 when gdalwarp warps the PDF (poppler driver) to GeoTIF

Here is gdalinfo for the file

Driver: PDF/Geospatial PDF
Files: AssembledMaps.pdf
Size is 3673, 2044
Coordinate System is:
PROJCS["UTM Zone 15, Northern Hemisphere",
    GEOGCS["NAD83",
        DATUM["North_American_Datum_1983",
            SPHEROID["GRS 1980",6378137,298.257222101,
                AUTHORITY["EPSG","7019"]],
            TOWGS84[0,0,0,0,0,0,0],
            AUTHORITY["EPSG","6269"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9108"]],
        AUTHORITY["EPSG","4269"]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",0],
    PARAMETER["central_meridian",-93],
    PARAMETER["scale_factor",0.9996],
    PARAMETER["false_easting",500000],
    PARAMETER["false_northing",0],
    UNIT["Meter",1]]
GeoTransform =
  494482.9934340139, 1.9797610687878, -0.4578063200329283
  3519200.148697479, -0.4578063200329283, -1.9797610687878
Metadata:
  NEATLINE=POLYGON ((491222.64246014197
3515690.1233778466,492158.60528832977 35
19737.6489099222,499430.68065023294 3518056.0308031105,498494.71782204515
351400
8.5052710348,491222.64246014197 3515690.1233778466))
Corner Coordinates:
Upper Left  (  494482.993, 3519200.149) ( 93d 3'29.84"W, 31d48'30.24"N)
Lower Left  (  493547.237, 3515153.517) ( 93d 4' 5.33"W, 31d46'18.79"N)
Upper Right (  501754.656, 3517518.626) ( 92d58'53.27"W, 31d47'35.67"N)
Lower Right (  500818.900, 3513471.994) ( 92d59'28.87"W, 31d45'24.24"N)
Center      (  497650.947, 3516336.072) ( 93d 1'29.32"W, 31d46'57.26"N)
Band 1 Block=3673x1 Type=Byte, ColorInterp=Red
Band 2 Block=3673x1 Type=Byte, ColorInterp=Green
Band 3 Block=3673x1 Type=Byte, ColorInterp=Blue

Does the scale_factor has something on this will gdal_translate -unscale
will help or there is some problem in handling this specific file or
projection parameters

Ganesan R
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