Hi Rajat, Surface reflectance should be used for calculating NDVI. Here is a link that explains the difference between radiance and surface reflectance.
Best, Jiao On Tue, Jul 1, 2014 at 11:59 PM, Rajat Nayak <[email protected]> wrote: > Dear All, > I am trying to calculate NDVI for my study area using landsat 8 products. > I calibrated images using i.landsat.toar. Now I'm a little confused. > If I use -r flag, I get radiance values at the sensor. If -r flag is not > used > I will get reflectance values. > Now the question is which one of the two, > radiance (obtained using -r flag) or surface reflectance (without any > flags) > should I use for calculating NDVI. > It will also be great if you can let me know the difference between the > two > and how it will influence my NDVI calculations. > > Thanking you > Regards > Rajat Nayak > > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user >
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