Radiometric calibration for Galileo images: gllssical
I am interested in applying the radiometric calibration to Galileo images. From my understanding, the calibration removes the dark current. However, I don't want the units of reflectance (I/F) or radiance. I am interested in getting the energy deposited per pixel. It is easy enough to find this using the DN and the gain, but I'm not sure how to get this from the radiance.
Many thanks in advance for your assistance!
#2 Updated by Moses Milazzo over 1 year ago
The gllssi calibration program does indeed remove the dark current and it also applies the rest of the radiometric calibration. Radiance units ( Watts/m2/sr) are the value you want the calibration to output if you are looking for energy. You'll then need to multiply the output values of gllssical by 10,000 (because gllssical calculates milliwatts); by the exposure time—with or without a small shutter offset correction—(this should be in the cube labels); by the area of the pixel at the surface (this will be the resolution—m/px—in the label); and by 2Pi (to account for the angle of emittance from the surface).
This will give you Joules/pixel.