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February 2007
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2007.02.02 20:44 "Re: get tifftag_geoasciiparams string", by Ed Grissom
Gennady - I believe Phil is correct below. You would probably get better info if you asked on the GeoTIFF list [geotiff@lists.maptools.org] although a lot of us hang out both places. I think the GeoTIFF spec (1) describes what the string is supposed to look like internally. I would assume that the TIFF code treats it as any other ASCII string type. The GeoTIFF spec requires that TIFFGetField() makes sure it has a terminating NULL . (1) http://geotiff.maptools.org/spec/geotiff2.4.html#2.4 -- ed grissom ed.grissom@intergraph.com -----Original Message----- From: tiff-bounces@lists.maptools.org [mailto:tiff-bounces@lists.maptools.org] On Behalf Of Phil Harvey Sent: Friday, February 02, 2007 2:25 PM To: tiff@lists.maptools.org Subject: Re: [Tiff] Re: get tifftag_geoasciiparams string On 2-Feb-07, at 2:36 PM, Gennady Khokhorin wrote: > Still can not find any reference for return from TIFFGetField(tif, > TIFFTAG_GEOASCIIPARAMS, &data) > command. Hi Gennady, I've never used TIFFGetField(), but I expect it just returns a null- terminated string for ASCII tags. (A null terminated string is just a character array where the length is determined by scanning for the first null byte.) The content of the TIFFTAG_GEOASCIIPARAMS will be a set of strings accessed via the TIFFTAG_GEOKEYDIRECTORY information. In a sample I have, it looks like strings may be separated by '|' symbols in the TIFFTAG_GEOASCIIPARAMS record, but you should check the GeoTiff documentation to be sure. I hope this helps. - Phil