[GRASS-user] v.select relate

[achim]

Hi Martin

Martin Landa schrieb:
> Hi,
> 
> 2009/8/12 achim <ak7 at jupiter.uni-freiburg.de>:
>> does anyone know, how the operator relate is meant in v.select (grass6.5)?
>>
>> Only explanation in module description is:
>> "relate - feature A is spatially related to feature B"
> 
> It checks if elements in the DE-9IM intersection matrix for the two
> features match the elements in 'relate' option.
> 
> See e.g.
> 
> http://www.postgis.org/documentation/manual-svn/ST_Relate.html

together with the link
http://docs.codehaus.org/display/GEOTDOC/Point+Set+Theory+and+the+DE-9IM+Matrix#PointSetTheoryandtheDE-9IMMatrix-9IntersectionMatrix
on this page its a very good explanation. Thanks!

> 
>> And a parameter <relate> is required, which isn't in description too.
> 
> The documentation needs to be improved... Feel free to help with that.
Yes, the documentation is extremely compact and full of gaps. Specially
it needs some pictures to improve the "getting the idea of what is
meant". Notably GIS deals with geometry objects ;).

Maybe each short and compact description needs a detailed one with
pictures, examples and application possibilities. ...so I gonna do
something.

> 
> Martin
> 

Achim