[GRASS-user] v.overlay missing polygon

[Richard Chirgwin]

On 13/03/12 6:36 AM, grass-user-request at lists.osgeo.org wrote:
> Dear Vincent,
>
> thanks for your idea. I wasn't aware of the possibility to snap a vector
> map to another one. Good thing to know!
> However, it didn't solve my problem.
> Actually, I checked the data with respect to my theory 2 again, and I
> must say: Visually it seems, that in this case the two data sets I would
> like to overlay match perfectly concerning the boundaries. The theory
> might be wrong.
>
>
> I did some further testing:
>
> Even if I isolate the polygon that disappears in the overlay process
>
> v.extract input=veg output=veg_137 list=137
>
> and use it for the overlay
>
> v.overlay ainput=plot atype=area binput=veg_137 btype=area operator=and
> output=res_137_and
>
> the result is erroneous. Nothing new, but still very strange.
>
>
> Tricky. I am puzzled and need to get home;-)
>
> Falko
Falko,

I agree - the same error reproduces for me, using your vectors.

Neither veg nor plot show any apparent errors in v.digit.

Anyone offer suggestions to try and debug this?

Richard