[GRASSLIST:7598] making v.what.rast work

[Eva L. Hulse]

I have a raster created from interpolated elevation points, and i have a 
vector of soil sample locations for the same area.  I want to use 
v.what.rast to get the elevation (z) from the raster, for each (x,y) 
point in the vector file.  I imported the vector grid from ascii text 
with the columns x, y, and z.  The value of z is currently 0.  I also 
imported the original elevation points file from ascii text (that i 
later turned into a raster using v.surf.rst).

Right now, what happens is this:
v.what.rast vector=kknGrid raster=kkn_mod_elev_surf column=z

Cannot get layer info for vector map

But since i really have no idea what i'm doing, can someone tell me how 
i can obtain the elusive "layer info for vector map"?

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Eva L. Hulse
PhD Student
University at Buffalo Anthropology Department
evahulse at buffalo.edu