= ATM = Consists of three files patterned as azYYMMDD[ABC].cal, where the last character before the .cal is A for scan speed 12.5, B = 25, C = 50. The contents of the files are like: {{{ AZ16 bandpairs 10 1 1000 az060306A.cal 87.72727273 24498 6.12019233 24468 2.31661442 24425 5.34458259 24501 2.05878963 24516 2.24453694 24704 1.29384497 24663 3.35342640 24280 0.64997509 24088 0.15410141 24283 }}} Format appears to be 10 pairs of numbers specifying min and max sensor value for that band. == ATM calibration procedure == (as described by Andrew Wilson and dodgily transcribed by Mike) = Specim = Calibration files are produced by Specim when they do maintenance on the instrument. == Eagle == Files look like: SN100022_130207_XB.cfg:: Lens configuration file - contains calibration date and a few other human-readable items SN100022_130207_XB.hdr:: Header file for the data file.. SN100022_130207_XB.cal:: Data file (containing several frames?) of the per-pixel calibrations == Hawk == SN300011_150207_NUC1.cfg:: Lens configuration file - contains calibration date and a few other human-readable items SN300011_150207_NUC1.hdr:: Header file for the data file.. SN300011_150207_NUC1.cal:: Data file (containing several frames?) of the per-pixel calibrations SN300011_150207_NUC1.bad:: Bad pixel table (text format, unsure of contents) = CASI = Radiometric calibration done by at Environment Agency (or Met Office?). Consists of five 700KB files named inXXaA.rad, where X = two digit calibration sequence (up to 36 for 2007) and A = aperature (1-5). Additionally, there is a file that describes the view angles for each pixel to compensate for (lens?) distortions in the view field. The current version of this file is named NERC253_527tan.txt and looks like: {{{ 0 26.311677 0.051465 1 26.221749 0.089928 2 26.131682 0.090067 3 26.041477 0.090205 4 25.951133 0.090344 5 25.860650 0.090483 6 25.770029 0.090621 7 25.679270 0.090759 8 25.588372 0.090898 9 25.497337 0.091036 ... 504 -26.131682 0.090205 505 -26.221749 0.090067 506 -26.311677 0.089928 507 -26.401465 0.089789 508 -26.491115 0.089649 509 -26.580625 0.089510 510 -26.669996 0.089371 511 -26.759227 0.089231 }}} I'm guessing CCD column number, X angle, Y angle.