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CRISM's Global Mapping of Mars, Part 2
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CRISM's Global Mapping of Mars, Part 2

Release Date: December 10, 2007
Latitude: 15.00 S
Longitude: 98.00 E
Keywords: Atmospheric, Southern Highlands
Parameters: N/A

After a year in Mars orbit, CRISM has taken enough images that the first parts of a global spectral map of Mars are now being released to the Planetary Data System (PDS), NASA's digital library of planetary data.



After a year in Mars orbit, CRISM has taken enough images that the first parts of a global spectral map of Mars are now being released to the Planetary Data System (PDS), NASA's digital library of planetary data.

CRISM's global mapping is called the "multispectral survey." The team uses the word "survey" because a reason for gathering this data set is to search for new sites for targeted observations, high-resolution views of the surface at 18 meters per pixel in 544 colors. Another reason for the multispectral survey is to provide contextual information. Targeted observations have such a large data volume (about 200 megabytes apiece) that only about 1% of Mars can be imaged at CRISM's highest resolution. The multispectral survey is a lower data volume type of observation that fills in the gaps between targeted observations, allowing scientists to better understand their geologic context.

The global map is built from tens of thousands of image strips each about 10 kilometers (6.2 miles) wide and thousands of kilometers long. During the multispectral survey, CRISM returns data from only 72 carefully selected wavelengths that cover absorptions indicative of the mineral groups that CRISM is looking for on Mars. Data volume is further decreased by binning image pixels inside the instrument to a scale of about 200 meters (660 feet) per pixel. The total reduction in data volume per square kilometer is a factor of 700, making the multispectral survey manageable to acquire and transmit to Earth. Once on the ground, the strips of data are mosaicked into maps. The multispectral survey is too large to show the whole planet in a single map, so the map is divided into 1,964 "tiles," each about 300 kilometers (186 miles) across. There are three versions of each tile, processed to progressively greater levels to strip away the obscuring effects of the dusty atmosphere and to highlight mineral variations in surface materials.

This is the second version of tile 750, in which a still-experimental correction for illumination and atmospheric effects has been applied. It shows a part of Mars called Tyrrhena Terra in the ancient, heavily cratered highlands. The colored strips are CRISM multispectral survey data acquired over several months, in which each pixel has a calibrated 72-color spectrum of Mars. A mathematical model of the effects of seasonal variations Mars' atmosphere has been used to correct brightness to how it would appear if each strip was imaged with the same illumination and without an atmosphere. The three wavelengths shown are 2.53, 1.50, and 1.08 micrometers in the red, green, and blue image planes respectively. Compared to data without corrections, strip-to-strip brightness differences have largely been eliminated. The residual bluish color of some areas is due to clouds that were not included in the mathematical model. The gray areas between the strips are from an earlier mosaic of the planet taken by the Thermal Emission Imaging System (THEMIS) instrument on Mars Odyssey, and are included only for context. Ultimately the multispectral survey will cover nearly all of this area.

The Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) is one of six science instruments on NASA's Mars Reconnaissance Orbiter. Led by The Johns Hopkins University Applied Physics Laboratory, the CRISM team includes expertise from universities, government agencies and small businesses in the United States and abroad.

CRISM's mission: Find the spectral fingerprints of aqueous and hydrothermal deposits and map the geology, composition and stratigraphy of surface features. The instrument also tracks seasonal variations in dust and ice aerosols in the Martian atmosphere, and water content in surface materials — leading to new understanding of the climate.

Credit: NASA/JPL/JHUAPL/Applied Coherent Technology

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