[GRASSLIST:7516] Re: Export question: how to get level 2 vector data

[Radim Blazek]

On 7/9/05, Bart <scarfboy at gmail.com> wrote:
> Hi all,
> 
> Maybe someone can give me the trouble of digging around.
> 
> I'm building an SVG-based viewer for exported GRASS
> data, and I just noticed that v.out.ascii ignores (some?)
> level 2 type vector data. (example map: spearfish 6, tractids)
> This means I can't fill anything, since areas aren't exported
> and boundaries are just segment lines, and to fill those
> individually just looks silly.
> (correct me if I'm wrong about any of this)

Correct, ASCII export is in GRASS topological format, i.e. no 
polygons. 
 
> My question is whether v.out.ogr does export all level 2 data -
> it mentions areas, though not islands. Are those ignored or
> exported as areas?

Areas + islands exported by v.out.ogr follow simple feature specification.

> Also, I'm guessing GML is my best bet for an easily parsable output?
> 
> (Side question: why do almost no feature types combine?  As
>  a quick test shows, to get all five I have to do four separate
>  exports. It's not really a problem [though it rules out a quick
>  and dirty xsl transform], I just don't get why.)

Are you sure?! [type=name[,name,...]], it depends on format
of course, shapefile can be of one type only.

Radim
 
> Thanks,
> --Bart Alewijnse
> 
>