Approach Movie

Mars Global Surveyor Mars Orbiter Camera Release:                  MOC2-10

Click on the following links for the version of choice
MPEG Movie (310 KBytes)
Quicktime Movie (4 MBytes)

This movie was created by combining the eight MGS/MOC MOI-22 day approach images into a map of Mars, and then digitally reprojecting that map onto a sphere. This is the same process used by the Hubble Space Telescope Mars Monitoring team in making its own MPEG (3.4 MB) and Quicktime (3.5 MB) rotation movies. The HST data were acquired when Mars was viewed more or less "face on," whereas MGS/MOC viewed the planet at half-phase. Thus, each of the eight MOC images required processing to remove the overall shading (the photometric function). Software provided by the Hubble Space Telescope Mars Monitoring team was used for this purpose. This software was also used to create a map projection of each image. These were then mosaiced together to create a map of the visible part of the planet (areas south of 66.4°S were not ever seen). Owing to foreshortening in the polar regions, some cosmetic processing was needed in areas south of about 35°S as well. Once the final map was created, a limited amount of enhancement was applied to sharpen features, and the resulting image was "mapped" onto a sphere using computer graphics software. A camera within this software was place at a relative distance and appropriate magnification to recreate the view seen from MGS, and an illumination source was set at the right location to simulate the sun. A set of test images were then created to compare with the original images. When the simulation recreated the input images, the rotation of the planet was simulated, and the camera position moved to observe the planet "face-on."

Note: The MOC images are made available in order to share with the public the excitement of new discoveries being made via the Mars Global Surveyor spacecraft. The images may be reproduced only if the images are credited to "Malin Space Science Systems/NASA". Release of an image does not constitute a release of scientific data. An image and its caption should not be referenced in the scientific literature. Full data releases to the scientific community are scheduled by the Mars Global Surveyor Project and NASA Planetary Data System. Typically, data will be released after a 6 month calibration and validation period.

Click Here for more information on MGS data release and archiving plans.

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