[Geotiff] User-defined keys

[tim.nightingale at stfc.ac.uk]

Dear All,

  How do you write user-defined keys? The GeoTIFF specification allows
user-defined keys with codes of 32768 and above (section 2.7.2), but the
libgeotiff library function GTIFKeySet() only accepts legal geokey_t
enumerations.

  My tentative conclusion is that I must extend the list "geokeys.inc"
before compiling. Is this right, and is there anything else I must do?

    Regards,

  Tim Nightingale.

------------------------------------------------------------------------
 Tim Nightingale
  RAL Space
    STFC Rutherford Appleton Laboratory
     Harwell Oxford
      Didcot                          Phone: +44/0 1235 445914
        OX11 0QX                      Fax:   +44/0 1235 445848
         United Kingdom               Email: tim.nightingale at stfc.ac.uk
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