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The Mars Reconnaissance Orbiter (MRO) spacecraft has been in orbit aroundMars since March 2006. The Context Camera (CTX) on MRO has returned over100,000 images of the planet at approximately 5-6 meters per pixel, providingnearly global coverage. During that time, Mars has gone through nearly 7 of itsown years, changing solar distance from 1.38 to 1.67 AU and the correspondingsolar flux by 45% due to its orbital eccentricity. Seasonal effects andtransient phenomena affect atmospheric transparency. Combined with an agingdetector, CTX images are difficult to mosaic seamlessly, for all of thesechanges prevent equalizing images to create a visually smoothly illuminatedproduct. We have developed a method, based on previous work by otherresearchers for other datasets, to mitigate almost all photometric variationsbetween images in order to create the appearance of an evenly illuminated,practically seamless mosaic. We describe how the process works, which uses areference source to tie brightness values, and demonstrate its effects acrossMars' surface. While the workflow developed for this product is applicable toother planetary bodies, it requires a reference source, which may not yetexist.

Empirical Photometric Control of Mars Context Camera Images