[GRASS-dev] Re: [GRASS-SVN] r33717 - grass/trunk/lib/gis

[Yann Chemin]

Wouldn't it be interesting then to have G_is_[fd]_nan_value()?

2008/10/8 Hamish <hamish_b at yahoo.com>:
> Glynn:
>>>> Make G_is_[fd]_null_value() check for any NaN, not just all-ones
>
> fwiw, I consider this a rare, but potentially very important change to
> the raster engine.
>
> Markus:
>> > /me backport this?
>>
>> Maybe.
>>
>> Unless there are modules which genuinely need to distinguish GRASS
>> nulls from other NaNs,
>
> It can help in tracking down bugs, e.g. see the BUGS section of the
> r.in.xyz man page.
>
> IMO only a module bug or buggy r.mapcalc expression can introduce a nan
> into a grass raster map, and so we shouldn't sweep them under the carpet
> as NULLs. They are distinct- mathematical null vs. spatial null.
>
>
> Hamish
>
>
>
>
>
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-- 
Yann Chemin
International Rice Research Institute
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