GENA for radiometric block adjustment
The Spanish company ALTAIS will use the generic network adjustment software platform GENA for the radiometric calibration and modelling of high resolution airborne digital imaging.
Radiometry is the measurement of radiance. It is a fundamental technique of astronomy, Earth remote sensing and modern photogrammetry. A digital imaging sensor measures incoming radiance (L) and stores the result of the measurement as a digital number (DN). Two central phases in the imaging process are the radiance transfer from object to a system and the transfer of the radiance entering the system (at-sensor radiance) to DNs inside the system. The units of L are W·sr^(-1)·m^(-2) (Watt per steradian per square metre). DN is dimensionless.