[GRASS-user] v.in.ogr: too many overlaps

[Markus Metz]

On Mon, Jun 25, 2018 at 8:26 PM, Rich Shepard <rshepard at appl-ecosys.com>
wrote:
>
>   While importing a polygon file grass7.5svn balked:
>
> "23125 areas represent multiple (overlapping) features, because polygons
> overlap in input layer(s). Such areas are linked to more than 1 row in
> attribute table. The number of features for those areas is stored as
> category in layer 2
>
> "If overlapping is not desired, the input data can be cleaned by snapping
> vertices to each other.
>
> "Estimated range of snapping threshold: [1e-09, 1]"
>
>   Please suggest snap parameter(s) to be applied with v.clean and when to
> stop cleaning.

The above suggested range for a snapping threshold applies to v.in.ogr. Is
there something unclear about the above suggestion?

When to stop cleaning depends on the data: do you want to get rid off all
overlaps? In this case you could also remove small areas with v.clean
tool=rmarea. The threshold depends on the input data. There is no
universally good threshold.

Markus M

>
> Rich
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