I would like to complete a point vector's table with Z data.
I am not able to take Z coordinate from a dtm
(downloaded from http://www.regione.piemonte.it/geoscaweb/index.php?pgs2=0&pgs3=DTM10&pgs4=DTM10_f&pgs5=.zip&pgs6=%20DTM%20(passo%2010%20m)%20-%20Modello%20altezze%20filtrato%20(fogli%2050.000)&pgs8=50),
I'm using GRASS from QGIS. All files are in its database, correctly imported.
I'm trying with v.what.rast but , even if it tells he succeeds, no new data has been recorded in the point vector's table and no new column appears.
I'm questiong about
1)the possibility of doing that with this particular DTMfile;
2)the fact that there aren't specific requirements for the point vector's table.