[Gvsig_english] Re: recommended raster exchange format

[G. Allegri]

I don't know if it helps.
Once I needed to export a float raster as an image with a color scheme
coherent with the one I had built inside GRASS (not preserving the
original pixel values).
To do it I had written this script:
http://www.geospatial.it/allegri/grass/r.out.jpeg_, that converts
grass rasters to georeferenced jpeg (with jgw)
I'm not so good in bash scripting, so I'm sure it could have been
written better, but it worked for me :-)

2008/8/14 Benjamin Ducke <benjamin.ducke at oxfordarch.co.uk>:
> Run r.info on your GRASS raster map.
> If the "Data Type" is FCELL or DCELL, you can use Float64.
> You will loose colour information.
> If it is CELL, then you need to look at the "Range of data"
> and choose an integer range that fits it UInt16 should work
> in most cases. But if you have negative values, then you need
> to use a signed integer type and you will lose colour information.
>
> Ben
>
> Tim Michelsen wrote:
>>
>> Hello,
>>>>
>>>> The r.out.gdal module is not very good at guessing the right data type
>>>> for your data. You may need to experiment a bit with the "type" option.
>>
>> since I think that gvSIG is also used by GRASS people [1] for mapping I
>> continue
>> on this list.
>>
>> Is there any help or hints one can use when deducting the raster type?
>> Sometimes FCell rasters are well exported with Float64 sometimes with
>> Uint16.
>> How can I know which one to choose?
>>
>>
>>
>> Thanks in advance,
>> Timmie
>>
>> [1]: http://www.mail-archive.com/grass-user@lists.osgeo.org/msg02648.html
>>
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>
>
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> Benjamin Ducke
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