[GRASS-user] v.extrude - keeping attribute table?

Jon Sundquist grass at sundquist.imapmail.org
Tue Nov 3 19:08:21 PST 2015

I have data on environmental parameters at varying depth intervals.  For each polygon of area, I duped the polygon data layer into multiple data layers, with each data layer having a single depth-specific record (I would ideally like to do it as the poster was asking about in this thread - http://osgeo-org.1560.x6.nabble.com/automate-v-extrude-from-a-table-td4978722.html#a4978730 but there seemed to be no easy way to do this other than some complex python scripting, so I separated/duped each polygon by hand and then all the records except for the one corresponding to that depth interval, before it got extruded).

I then ran v.extrude to generate the volume corresponding to each
separate data layer.  However, the resulting 3d data layer does not
appear to have an attribute table.

Does v.extrude not "bring along" the attribute table or am I doing
something wrong?

I need the attribute table info, since I plan to merge these separate
extruded data layers into a single data layer and then query them based
on the a field value and then visualize the results in nviz. However,
if the attribute table doesn't follow into the extruded shape, then I
can't query.


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