[GRASS-dev] r.null apparently doesn't work on vrt via r.external on G7

Vaclav Petras wenzeslaus at gmail.com
Thu Dec 19 07:11:18 PST 2013


On Thu, Dec 19, 2013 at 9:46 AM, Newcomb, Doug <doug_newcomb at fws.gov> wrote:

> I thought r.external was a read-only link.
>
> r.external manual does not say anything about it. However, the example
there is read-only. And I'm not sure in which category (r/rw) r.null is.

http://grass.osgeo.org/grass70/manuals/r.external.html
http://grass.osgeo.org/grass70/manuals/r.null.html


> Doug
>
>
> On Thu, Dec 19, 2013 at 3:35 AM, Margherita Di Leo <
> dileomargherita at gmail.com> wrote:
>
>> Hi All,
>>
>> Is it an expected behaviour that r.null doesn't affect vrt raster linked
>> via r.external?
>> Tested on forest map 2000 available for download from
>> http://forest.jrc.ec.europa.eu/download/data/forest-data-download/
>> I build the mosaic with gdalbuildvrt and then use r.external
>> then I want to set to null the values 0,2,3:
>> r.null mosaic setnull=0-2-3
>> this command doesn't have any effect on the map.
>>
>> thanks
>>
>> madi
>>
>> --
>> Best regards,
>>
>> Dr. Margherita DI LEO
>> Scientific / technical project officer
>>
>> European Commission - DG JRC
>> Institute for Environment and Sustainability (IES)
>> Via Fermi, 2749
>> I-21027 Ispra (VA) - Italy - TP 261
>>
>> Tel. +39 0332 78 3600
>> margherita.di-leo at jrc.ec.europa.eu
>>
>> Disclaimer: The views expressed are purely those of the writer and may
>> not in any circumstance be regarded as stating an official position of the
>> European Commission.
>>
>> _______________________________________________
>> grass-dev mailing list
>> grass-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/grass-dev
>>
>
>
>
> --
> Doug Newcomb
> USFWS
> Raleigh, NC
> 919-856-4520 ext. 14 doug_newcomb at fws.gov
>
> ---------------------------------------------------------------------------------------------------------
> The opinions I express are my own and are not representative of the
> official policy of the U.S.Fish and Wildlife Service or Dept. of the
> Interior.   Life is too short for undocumented, proprietary data formats.
>
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