Re [Geotiff] GeoTIFF Tags for Coordinate Transformations
    noel khan 
    noel.khan at rdmd.ocgov.com
       
    Wed Jan  2 18:50:07 PST 2008
    
    
  
FYI,
The problem was that I glossed over section 2.3 of the GeoTIFF spec, which
emphatically stated that the IEEE 'double' data-type had to be supported. I
just assumed that the bit-representation of 'double' values was similar to
that of other standard-TIFF data types, except that double's had 64 bits.
Education is  expensive.
Now having read the (wiki page on the) IEEE-754 spec and implemented code to
decode/encode the same, my program is now reporting the correct values for
ModelPixelScaleTag and ModelTiepointTag. Yea for me!
To others who are, or will, write a low level library based on any spec,
mind the data-types!
Noel
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