[GRASSLIST:4565] different CELL integer types?

[William K]

I've been importing a bunch of SRTM data recently and noticed that 
there seems to be (at least) 2 different integer cell types - 16 bit 
and 32 bit.  As imported, one tile takes up a maximum of 2.7MB in the 
CELL file, same as the source SRTM data file, and in the GRASS header 
file it's type is 1.  After I run it thru fillnulls, I round that back 
to integers with r.mapcalc, and the CELL file sizes double, and the 
GRASS header has a type of 3.

So, is there a way to get these back to the 16 bit cell types?  Since 
these are meter elevations on the earth, I'm not worried about them 
ever going beyond +/-32767.  Normally I wouldn't worry about it, but 
I've converted many GB of these SRTM tiles now and saving a few GB 
would be nice.

-----
William Kyngesburye <kyngchaos at charter.net>
http://webpages.charter.net/kyngchaos/

Theory of the Universe

There is a theory which states that if ever anyone discovers exactly 
what the universe is for and why it is here, it will instantly 
disappear and be replaced by something even more bizarrely 
inexplicable.  There is another theory which states that this has 
already happened.

-Hitchhiker's Guide to the Galaxy 2nd season intro