Re: Adding scale, offset, units metadata to geotiff

To: John Caron <caron@xxxxxxxxxxxxxxxx>
Subject: Re: Adding scale, offset, units metadata to geotiff
From: Rob Raskin <raskin@xxxxxxxxxxxxxxxxxxxx>
Date: Wed, 13 Jul 2005 12:58:40 -0700

GeoTIFF alraady includes the option for scale and offset in the "z-direction". But most client tools (including ArcGIS) ignore that tag.

It isn't clear why this information was added to the private GDAL tag.

-Rob


John Caron wrote:


FYI:

Martin Daly and I are discussing adding this tag to the thredds server
geotiffs:

  http://www.awaresystems.be/imaging/tiff/tifftags/gdal_metadata.html

this would allow us to put out 8-bit geotiffs, but clients could convert
back to floats, using a scale and offset.
We can specify the units also!!

Any comments on this idea are welcome.


--
____________________________________________________
Rob Raskin                       raskin@xxxxxxxxxxxx
Jet Propulsion Lab, 300-320      (818) 354-4228
Pasadena, CA 91109               (fax)(818) 393-2718

Follow-Ups:
- Re: Adding scale, offset, units metadata to geotiff
  - From: Frank Warmerdam

References:
- Adding scale, offset, units metadata to geotiff
  - From: John Caron