-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Andrew Brooks skrev: > On Tue, 10 Aug 2010 11:46:00 +0100, Martin Raspaud > <[email protected]> wrote: >> We have a satellite image in black and white, which show IR brightness >> temperatures. The data is scaled between 0 and 255 for viewing, and >> this is >> packed in a geotiff file >> >> Now some users would like to have the true value of the brightness >> temperature >> embedded in the file also. > > Maybe you can simulate something close by putting a scale and offset (slope > and intercept) into the geotiff so you still display 8-bit values but a > decent > image viewer will also calculate the true values and give a pixel > readout of > the true value under the cursor. I say simulate because 8 bits may not give > sufficient resolution.
Hmmm, that sounds like a sufficient solution indeed, very good idea, thanks. Is there any scale/slope and offset/intercept tags defined in geotiff ? Best regards, Martin -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJMYTUZAAoJEBdvyODiyJI4rOcIAJmI0PzHTOX7hHWD72NcnATG KKgZFbGMtTL0rAGkexdqSv1fHsqGRL6Jp9QM+qi3Z/FFt6V6iNtlpiJX88k0Limb aqRO61oHHf3tM0EbWfeSXe0dju/n9BkDiHpJ00k4kKVdyJ+7/7QlYNNHu1/4L+Xa FO1Cm9X7eBHrq80PD0+oDNVq2D2epnj1EaiHCgiOpMiXZomf/4xs9AOVpG8aeJEf tx06IO6wb18FuIZHk9mhu8nMqA4F+JEF9AZ0VXACvcDA8q17Q4PjngE0Mpba0tlg vasSf9vJ/XCuNOOEGEq2lmE3Fp7Ec0ShTbuPBTNPHBKPhJKL4ffCyv7BXYtyUsc= =3pgP -----END PGP SIGNATURE-----
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