[GRASSLIST:6554] Re: MASK confussion
werchowyna at epf.pl
Tue Apr 19 15:23:46 EDT 2005
From: "Glynn Clements" <glynn at gclements.plus.com>
> Maciek Sieczka wrote:
>> Is it normal and intended that "0" is taken the same as the "null" when
>> doing "r.mapcalc 'MASK=some_raster"?
>> It took me over an hour to guess my there where holes in my MASK.
>> Shouldn't "0" be treated as a regular, valid value for MASK?
> Masks used to be zero/non-zero before support for a distinguished NULL
> value was added in 5.0. The existing behaviour maintains backwards
I see. But is backward compatibility so important here? IMHO all Grass
oldtimers users got used to using NULL for no-data instead of ZERO, and
newbies use NULL by default.
Also, all Grass commands I know use NULL for no-data. And if they support
ZERO it is an option. Shouldn't MASK follow this?
Just my ideas.
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