[GRASS-user] problem: boundary lines double

[Markus Metz]

On Tue, Feb 1, 2011 at 4:43 PM,  <mails-foren at gmx-topmail.de> wrote:
>
> Hello Maris,
>
> thanks a lot for replying.
> Yes, I imported an esri shapefile. I'd tried to clean data with v.clean and with many different grass clean modules, without any success.
> Any other idea how to solve this issue? Maybe there is a method to import esri shapefiles without saving double the boundary?
>
The imported shapefile should be clean if v.in.ogr was not used with
the -c flag, i.e. v.in.ogr did topological cleaning. Duplicate
boundaries should not exist when using v.in.ogr with default settings.

Markus M

>
> -------- Original-Nachricht --------
>> Datum: Thu, 27 Jan 2011 21:35:17 +0200
>> Von: Maris Nartiss <maris.gis at gmail.com>
>> An: mails-foren at gmx-topmail.de
>> CC: grass-user at lists.osgeo.org
>> Betreff: Re: [GRASS-user] problem: boundary lines double
>
>> Hello,
>> looks like Your data are coming from non-topological vector storage
>> (Shapefile?). Cleanness of data stored in non-topological formats
>> (i.e. Shapefile) depend on data creation software abilities to produce
>> cliean-look data and not are enforced by data storage, as it is in
>> GRASS.
>>
>> Without seeing more information, my guess would be - You imported
>> shapefile with areas into GRASS, still they had slivers and thus
>> feature count has increased. Only way out is to clean data with
>> v.clean and friends or by hand.
>>
>>
>> Maris.
>>
>> http://grass.osgeo.org/grass64/manuals/html64_user/v.clean.html
>>
>>
>> 2011/1/27, mails-foren at gmx-topmail.de <mails-foren at gmx-topmail.de>:
>> > Hello,
>> >
>> > if I import a shape (414 features) with v.in.ogr.qgis I get output with
>> 594
>> > features. I had read the problem is, that a boundary line between two
>> > polygons get saved double. How can I manage to save as one boundary line
>> > between two polygons?
>> >
>> > Thanks a lot in advance!
>> >
>> > Steffen
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>
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