2007.02.01 23:14 "[Tiff] Re: get tifftag_geoasciiparams string", by Phil
Harvey
Thread
2007.02.02 20:44 "RE: [Tiff] 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
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.