This data set consists of a catalog of clouds observed in Mariner 9 and Viking Orbiter images.
The entire Mariner 9 and Viking Orbiter image data sets (approximately 7400 and over 50000 images, respectively) were examined at least twice, by two separate observers. Cloud occurrences were compiled by examining images for specific cloud morphologies, examining the same area at different times, utilizing limb images, and consulting photomosaics to determine the spatial relations of cloud obscurations. The data set contains details of the cloud occurrences and the images in which they were observed.
Useful Mission Documents
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Data Description Document
The Data contained within the Mariner 9 PDS cloud archive provide the location (latitude, longitude), time (Ls and time-of-sol), cloud type, and other quantitative aspects of the cloud occurrence and image conditions under which the cloud was detected.
in tabular ASCII form.
Mariner 9 (spanning Ls 293 MY 9 to Ls 98 MY 10), Viking 1 (spanning Ls 85 MY 12 to Ls 140 MY 14) and Viking 2 (spanning Ls 107 MY 12 to Ls 116 MY 13) orbiter cloud data are contained in the same volume (vomr_0001). The file structure is the same for all 3 missions.