stephen sefick wrote: > I would like to calculate NDVI and > EVI from ladsat 5 data. The data > is scaled 0-255. Do I need to convert this to > watts/meter sqaured > before I proceed? I have done this calculation > (band4-band3)/(band5+band3) and get a map filled with > zeros. What am I doing wrong.
maybe it is integer division resulting in a integer result? try (1.0*band4-band3)/(band5+band3) to introduce a floating point value and so get a floating point result. Hamish _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user