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| GeoCommunity Mailing List |
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| Subject: | Re: [gislist] 32 bit to 8 bit raster conversion (was (no subject)) |
| Date: |
07/26/2006 04:50:00 PM |
| From: |
Bryan Keith |
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Sean,
I've done such a thing using gdal_translate, but you may have to lose
information depending on what information you have in your input
dataset. For example, I've converted 32 bit floating point DEM data to
8 bit (0-255) integers by simply scaling the input to 0 - 255. This can
be done with the -scale option using gdal_translate. However, if your
32 bit input is 4-byte integers and you're only actually using 256 (or
less) unique values then you ought to be preserve all the information.
In that case you'll need a lookup table between the input and output
values and probably a short script to do the conversion.
What are you trying to do?
I took the liberty of adding a subject to the header.
Bryan
Bryan Keith
GIS Specialist
Geomega, Inc.
Boulder, CO, USA
Sean Grimland wrote:
> Hello list,
>
> I am looking for advice on how to best convert ESRI 32
> bit grids into 8 bit GeoTiffs for use with Mapserver.
> I know I can convert from grid to tif with GDAL but
> the conversion from 32 bit to 8 bit has me perplexed.
> I don't want to use Photoshop or anything else that
> will destroy my georefences.
>
> Thanks in advance.
>
> Sean Grimland
>
>
>
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