[GRASS-user] v.select - so close but so far!

[Hamish]

> i'm using v.select as such:
> 
> v.select ainput=buildings atype=point alayer=1 binput=clipper
> btype=area blayer=1 outpout=buildclip operator=overlap
> 
> where buildings are a point, with layer 1 (verified through QGIS)
> where clipper is a polygon that is the bounds i want to pull the
> building points from.  the odd thing about this dataset, is that when
> i go to load in QGIS, there are two layer options, layer 0 which is
> polygon and layer 1 which is line.
> 
> i cant specify blayer=0 in this function or it says must be 1 or
> greater.
> 
> is there a way to put the polygon layer on layer 1? i can only think
> this might be why there's a problem.  I still dont really grasp the
> layers concept very well.  i understand it has to do with linking
> features to a database, but why does it put different features on
> different layers?
> 
> the output i get is a file with no data in it.


I don't think QGIS layers == GRASS layers.

Unless you are doing something advanced, usually grass vector layer is 1
and you can forget about that.

"v.info clipper"  show boundaries + centroids or lines?

features need a category number in order to be extracted. does
d.what.vect show cat numbers for your points?

v.select works well and should be pretty simple, so don't give up.


Hamish