[GRASS-user] How to extract only areas, without boundaries from a vector file ?

[Le Jeune Yann]

It works perfectly !!!!

Thanks a lot !

yann

2013/2/8 Moritz Lennert <mlennert at club.worldonline.be>

> On 08/02/13 12:02, Le Jeune Yann wrote:
>
>> Hi,
>>
>> Working on GRASS7 / debian, i would like to extract only areas but
>> "v.extract --overwrite input=ZONE type=area output=ZONE_AREA" produce 1
>> area and 1 boundary, each of them with cat and attributes.
>>
>> I would like only a vector file with cat and attributes of the areas.
>>
>> If someone has a solution ?
>>
>
> This means that your boundaries have cat values in ZONE already and they
> are just preserved. Erase those cat values before the extraction:
>
> v.category ZONE op=del cat=-1 type=boundary out=zones_temp
> v.extract input=zone_temp type=area output=ZONE_AREA
>
> If your input does not have cat values on the boundaries, the output won't
> either:
>
> GRASS 7.0.svn (nc_spm_08):~ > v.extract census_wake2000 type=area
> out=test_all
> GRASS 7.0.svn (nc_spm_08):~ > v.category test_all op=report
> Layer/table: 1/test_all
> type       count        min        max
> point          0          0          0
> line           0          0          0
> boundary       0          0          0
> centroid     105          1        105
> area         105          1        105
> face           0          0          0
> kernel         0          0          0
> all          105          1        105
>
> Moritz
>



-- 

Yann Le Jeune
Web : http://www.paleosystem.fr/ylj_pro/
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