[GRASS-user] Error while exporting

[Markus Metz]

On Wed, May 18, 2011 at 10:29 AM, Glynn Clements
<glynn at gclements.plus.com> wrote:
>
> Markus Metz wrote:
>
>> >> The NULL value of the reclass map is not recognized as NULL value, but
>> >> instead treated as a valid number.
>> >>
>> >> This seems to be a bug in the GRASS library, specifically in
>> >> G_get_null_value_row() and has probably been around since GRASS 6.3.
>> >
>> > AFAICT, it has been around as long as G_get_null_value_row() has
>> > existed. G_get_null_value_row() returns the raw data, without any
>> > reclass applied.
>> >
>> > As it stands, this function probably isn't of much use.
>>
>> Remove?
>
> No, fix (as per r46323).
>
Done in r46345, r46346.

> If you only care about whether a cell is null or non-null, reading and
> decoding the actual data is needless overhead.
>
> If you need to read the data anyhow, then use that rather than reading
> the null data a second time (the raw data is cached, but conversion
> and masking will be re-done).
>
> r.out.gdal was the latter case, so it shouldn't have been using that
> function. OGSF is also the latter case, and should be fixed.
>
OGSF fixed in r46347 for trunk. This is an enhancement, no bug because
[Rast|G]_get_null_value_row is fixed, so the OGSF change does not need
to be backported.

Markus M