User Manual - pancroma

Temperature (measured in degrees Kelvin) is then given by:T = K2 / (ln(K1/ L λ + 1)Where K1 and K2 are constants derived from Planck’s radiance function.The technique for computing surface temperatures is as follows. First, open youASTER L1B HDF data file. (Note that ASTER L1A HDF data is implementeddifferently from L1B data, and currently PANCROMA will not handle L1A datasuccessfully). Do this by selecting ‘ASTER L1B HDF’ from the File Type dropdown box and clicking on your ASTER scene. Next select ‘PreProcess’ |‘Compute Surface Temperatures’ | ‘ASTER L1B TIR’ from the PANCROMA TMmenu.The TOA Reflectance Data Form will become visible. Set the TIR band numberthat you wish to process. Acceptable band numbers are 10, 11, 12, 13 or 14.You can also select various display and file output options. You can display thesurface temperatures as a grayscale image or as a color contour image. Thesetwo, along with the thumbnail are shown in the figure below. The surfacetemperatures are indicated by the color scale bar at the upper left hand corner ofthe image. For the grayscale image, the darker the pixel, the cooler thetemperature.194