Posted by zakariasayegh on March 28, 2006, 7:39 am
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how i can convert digital numbers to radiance values
so , i am using a satellite images from landsat
how I can do it by using model maker
thanks
Posted by rsmgeo on March 30, 2006, 4:58 am
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Do you mean at-sensor-radiance or ground-reflected-radiance. For the
former you must have calibration offset and calibration gain to invert
the DNs according to the sensor model. For LS I think this might be
something like: radiance = c0 + c1 * DN
It can be much more complicated to obtain ground-reflected-radiance
values. This implies some sort of atmospheric correction. This can be
done empirically (there are some simple methods in the literature that
don't perform too bad) or physically based via the inversion of a
lookup table created among others by a RTC.
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