[FWTools] calculate from meters to feet

[Frank Warmerdam]

znfmail-newsletters at yahoo.com wrote:
> So I really have two questions right now. Since my goal is to merge all 
> the tiles into the bigtiff I've decided it would be best to process the 
> raw 1x3 degree grids delivered to us. Is there a gdal utility for 
> converting the Z value from meters to feet?

Zach,

You can rescale image data with the -scale option to gdal_translate.
For instance:

   gdal_translate -scale 0 0.3048 0 1.0 meters.tif feet.tif

should rescale meters to us feet (essentially rescale the input
range 0 to 0.3048 to the output range 0 to 1.0.

> Alternate question would I be better off exporting from my 7.5 minute 
> tiles already processed then translate and merge (examples below)?

I have no opinion on this.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent