[GRASS-dev] Importing large data into GRASS

[Markus Metz]

On Mon, Feb 11, 2013 at 11:30 AM, Rashad M <mohammedrashadkm at gmail.com> wrote:
> But I need the whole data and to do some geo processing over it.

OK. In contrast to GADM v1, GADM v2 contains a lot of floating point
representation errors in the coordinates, most probably created by the
software used to create GADM v2. You need to perform additional
cleaning with snapping to a very small threshold, i.e. v.in.ogr
snap=1e-7. And you should use GRASS 7 for the import of large vector
data, because the import may not work with GRASS 6.

Markus M


>
>
> On Mon, Feb 11, 2013 at 3:18 PM, Markus Metz <markus.metz.giswork at gmail.com>
> wrote:
>>
>> On Mon, Feb 11, 2013 at 9:55 AM, Rashad M <mohammedrashadkm at gmail.com>
>> wrote:
>> > Hi,
>> >
>> > I cant import very large data in GRASS7 && G6. it reads the features but
>> > hangs with 98% Breaking Boundaries when building topology
>> >
>> > I am using latest grass from svn maybe 3 days old
>> >
>> > If somebody needs to test for this problem you can get data here[1]
>> >
>> > [1] http://www.gadm.org/data2/gadm_v2_shp.zip
>>
>> This is indeed a very large dataset. You can try to import only the
>> part overlapping with your area of interest: first set the region
>> accordingly, then use v.in.ogr -r
>>
>> Markus M
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> --
> Regards,
>    Rashad