Forgot the link: http://www.exelisvis.com/Home/NewsUpdates/TabId/170/ArtMID/735/ArticleID/13592/Digital-Number-Radiance-and-Reflectance.aspx
On Wed, Jul 2, 2014 at 8:59 AM, Jiao Wang <[email protected]> wrote: > 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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