[GRASS-dev] gdal import an nodata cells

GRASS GIS GRASS GIS developer
,
1

I just imported a DEM that was sent to to in Erdas IMG format (HFA),
with r.in.gdal, and after importing I had to use r.mapcalc to make the
NODATA cells -- which were tagged as -32768 -- became NULL.

I was just wondering if there is a way to do this automatically? can I
pass the -32768 value as an option to r.in.gdal so the cell will be
imported as null?

cheers

Carlos

--
+-----------------------------------------------------------+
              Carlos Henrique Grohmann - Guano
  Visiting Researcher at Kingston University London - UK
  Geologist M.Sc - Doctorate Student at IGc-USP - Brazil
Linux User #89721 - carlos dot grohmann at gmail dot com
+-----------------------------------------------------------+
_________________
"Good morning, doctors. I have taken the liberty of removing Windows
95 from my hard drive."
--The winning entry in a "What were HAL's first words" contest judged
by 2001: A SPACE ODYSSEY creator Arthur C. Clarke

2

Carlos "Guâno" Grohmann schrieb:

I just imported a DEM that was sent to to in Erdas IMG format (HFA),
with r.in.gdal, and after importing I had to use r.mapcalc to make the
NODATA cells -- which were tagged as -32768 -- became NULL.

I was just wondering if there is a way to do this automatically? can I
pass the -32768 value as an option to r.in.gdal so the cell will be
imported as null?

cheers

Carlos

you can use r.null to set the null flag.

3

Yes, but I was thinking how to do this _at once_ ,in the import process.

C

On 7/19/07, WolfgangZ <wollez@gmx.net> wrote:

Carlos "Guâno" Grohmann schrieb:
> I just imported a DEM that was sent to to in Erdas IMG format (HFA),
> with r.in.gdal, and after importing I had to use r.mapcalc to make the
> NODATA cells -- which were tagged as -32768 -- became NULL.
>
> I was just wondering if there is a way to do this automatically? can I
> pass the -32768 value as an option to r.in.gdal so the cell will be
> imported as null?
>
> cheers
>
> Carlos
>

you can use r.null to set the null flag.

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--
+-----------------------------------------------------------+
              Carlos Henrique Grohmann - Guano
  Visiting Researcher at Kingston University London - UK
  Geologist M.Sc - Doctorate Student at IGc-USP - Brazil
Linux User #89721 - carlos dot grohmann at gmail dot com
+-----------------------------------------------------------+
_________________
"Good morning, doctors. I have taken the liberty of removing Windows
95 from my hard drive."
--The winning entry in a "What were HAL's first words" contest judged
by 2001: A SPACE ODYSSEY creator Arthur C. Clarke