[GRASS-user] v.surf.rst limitations?

[roberto.antolin at polimi.it]

Hi Carlos and all

"Carlos \"Guâno\" Grohmann" <carlos.grohmann at gmail.com> ha escrito:

> Roberto, can v.surf.bspline work with opint data imported as
> v.in.ascii -vbt? I mean, without topolopgy nor table? Or I do need a
> table?
>
> thanks
>
> Carlos
>

Yes, of course. In fact, this module was developed to work with LiDAR  
points -although it will be able to interpolate another kind of points  
in the next version(*)-. GRASS can't create the topology for the  
amount of data that LiDAR supplies. Indeed, it is also unnecessary  
create it if you work with a point vector map.

So, v.in.ascii -zbt should work (sorry, I don't know what -v flag  
within v.in.ascii means). Anyway, you should use -z flag in order to  
create a 3d vector map, i.e., in order to record z-coordinates. In  
other case, v.surf.bspline will interpolate zeros.

Cheers,
Roberto.

PS: (*) I sent the new version to Markus this morning (in Europe). So,  
CVS update will be ready very soon.