Hi! simple test with r.volume. Small testing dataset here:
http://ubuntuone.com/2Odq6BDeQDdQhIJX2D8sHn On Grass 6.4 r.volume --overwrite data=slope clump=basin centroids=centroid1 Cat Average Data # Cells Centroid Total Number in clump Total in clump Easting Northing Volume 1 2.92 229610 78593 635195.00 220715.00 22961000.00 Total Volume = 22961000.00 On Grass 7.0 r.volume --overwrite input=slope clump=basin centroids=centroid1 Cat Average Data # Cells Centroid Total Number in clump Total in clump Easting Northing Volume 1-57817810.36-4544075169558 78593 635195.00 220715.00 -454407516955800.00 -- Best regards, Dr. Margherita DI LEO Scientific / technical project officer European Commission - DG JRC Institute for Environment and Sustainability (IES) Via Fermi, 2749 I-21027 Ispra (VA) - Italy - TP 261 Tel. +39 0332 78 3600 margherita.di-...@jrc.ec.europa.eu Disclaimer: The views expressed are purely those of the writer and may not in any circumstance be regarded as stating an official position of the European Commission.
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