[gdal-dev] Re: Using a gdal generated tiff to generate DEM tiles - losing registration

[Iain]

That might be the answer - or at least part of it,  I still get brain fade
trying to work through projections and projection conversion.

I'll try and think this bit through again!

Here's the gdalinfo from the input file :

Driver: GTiff/GeoTIFF
Files: brw.tif
Size is 48243, 78372
Coordinate System is:
PROJCS["unnamed",
    GEOGCS["unnamed ellipse",
        DATUM["unknown",
            SPHEROID["unnamed",6378137,0]],
        PRIMEM["Greenwich",0],
        UNIT["degree",0.0174532925199433]],
    PROJECTION["Mercator_1SP"],
    PARAMETER["central_meridian",0],
    PARAMETER["scale_factor",1],
    PARAMETER["false_easting",0],
    PARAMETER["false_northing",0],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]]]
Origin = (-1224560.781847173348069,8625918.873687559738755)
Pixel Size = (30.000000000000000,-30.000000000000000)
Metadata:
  AREA_OR_POINT=Area
Image Structure Metadata:
  INTERLEAVE=BAND
Corner Coordinates:
Upper Left  (-1224560.782, 8625918.874) ( 11d 0'1.50"W, 61d 0'1.50"N)
Lower Left  (-1224560.782, 6274758.874) ( 11d 0'1.50"W, 48d59'57.82"N)
Upper Right (  222729.218, 8625918.874) (  2d 0'2.92"E, 61d 0'1.50"N)
Lower Right (  222729.218, 6274758.874) (  2d 0'2.92"E, 48d59'57.82"N)
Center      ( -500915.782, 7450338.874) (  4d29'59.29"W, 55d27'11.78"N)
Band 1 Block=256x256 Type=Int16, ColorInterp=Gray


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