[GRASSLIST:4260] Re: shp import issue

[Paul Kelly]

On Thu, 26 Aug 2004, Maciek Sieczka wrote:

> Hello Everybody
>
> I have an shp file with 1398 polygons. I can't import it into a proper
> vector file using v.in.shape because many unclosed ares and some double
> lines occure after v. support. However it imports perfect into a raster
> consisted of 1398 polygons using r.in.shape. What may it be?

Topological errors like unclosed area boundaries do not matter for raster 
data or for the Simple Features vector model used in Shapefiles, but GRASS 
uses a topologically correct vector model and the data are considered as 
errors.

GRASS 5.7 (v.in.ogr especially) has many convenient facilities for fixing 
these errors (which are caused by bad quality data).

Paul