User:Marskell/Mars Chart

The United States Geological Survey's Mars Chart (MC) system divides the planet Mars into thirty quadrangles to provide a simple and uniform mapping and image mosaic formula for the planet. The MC system provides the basis of the Mars Digital Image Model (MDIM), a global image map of Mars. MDIM models 1.0, 2.0, and 2.1 were released in 1991, 2001, and 2005, respectively.

The Mars Chart maps work on a 1:5,000,000 basis, with Viking mission images incoporated to produce the MDIM. Refinements over the course of three MDIM models have produced a positional accuracy of one pixel for the images, corresponding to just 200m on the Martian surface.

The Quadrangles
Of the thiry quadrangles, sixteen straddle the equator, eight ranging up to 30°N and covering 45° degrees of longitude, and another eight with identical coordinates for the southern hemisphere.