Northwest Meridiani

Long before the MER landers were named or launched, the two orbiters at Mars were asked to examine landing sites. Both the Odyssey and Mars Global Surveyor spacecraft have been collecting landing site data for the past two years. The MGS and ODY data were used as part of the decision making process in the final selection of the two landing sites. The types of data collected by the two orbiters included not only images of the surface but also thermal data about the surface composition, atmospheric data about the climate at each location, and the tracking of major dust storms in the region prior to landing. The presence of, and data collected by, the MGS and ODY orbiters have proven invaluable in MER mission planning.
This image, captured on 13 December 2002, covers an area to the north of Opportunity's landing spot in Meridiani Planum. The typical layers of the region are visible at toward the top of the image and small dunes can be found in most depressions.