I've imported a set of 3D points (z,y,z) into GRASS GIS. I'm having trouble: a) visualising my dataset in 3D using nviz or the standard data viewer (I can only get a 2D plan view of my data) and, b) interpolating them into a solid 3D voxel object. My dataset is pretty straightforward and there's only 1520 points.
The GRASS user interface is not that user friendly and I can't find a suitable tutorial to follow. Any ideas or pointers would be very much appreciated. I'm sure I should be using the v.vol.rst tool, but when I input my parameters, I get the following error message: ERROR: Column type of wcolumn is not supported (must be integer or double).