[GRASS-dev] vlib api: is area an isle?

[Martin Landa]

Hi,

2013/3/25 Markus Metz <markus.metz.giswork at gmail.com>:

[...]

> All areas also form isles. You probably want to skip areas that are
> part of isles which in turn are inside another area. The easiest way

I was not precise enough in my question. But you are right. That's
what I want (concretely for simple feature output defined by
`v.external.out`).

> to find out if an area is part of an isle inside another area is to go
> through the area's boundaries, get for each boundary the areas on the
> left and right and check if one of them is an isle. Then use
> Vect_get_isle_area() and check if this is > 0.

Thanks, I just wondered if there is more straightforward approach.

Martin

-- 
Martin Landa <landa.martin gmail.com> * http://geo.fsv.cvut.cz/~landa