PRISM At SENSOR ORTHORECTIFIED RADIANCE PRODUCT Last Modified 19 October 2013 by D. R. Thompson Contacts: Pantazis Mouroulis, Jet Propulsion Laboratory Joe Boardman, AIGLLC Robert O. Green, Jet Propulsion Laboratory Sarah R. Lundeen, Sarah.R.Lundeen@jpl.nasa.gov David R. Thompson, David.R.Thompson@jpl.nasa.gov The PRISM Level 1B processing pipeline transforms PRISM raw data to L1B radiance. The following steps are involved: 1) Radiometric correction (dark subtraction, flat field correction, application of radiometric calibration coefficients) 2) Orthorectification (calculation of observation geometry and illumination on a pixel-by-pixel basis) 3) Artifact mitigation (pedestal shift, panel ghost). Pedestal shift is a detector-related artifact in which a brightly-illuminated portion of the scene artificially changes the zero level. This effect is corrected using laboratory modeling and the zero level of non-illuminated PRISM channels. A "panel ghost",in which bright features in one quadrant can cast a negative residual image on the others is corrected through modeling of its magnitude as a function of illumination, and subtracting it from the raw data before applying radiometric calibration. The products are: *_rdn_ort - Radiance in units of uW/cm^2/nm/sr (micro-Watts per centimeter squared per nanometer per steradian)