The innermost planet of our solar system is being investigated by the National Aeronautics and Space Administration (NASA) MErcury Surface, Space ENvironment, Geochemistry, and Ranging (MESSENGER) mission. The Astrogeology Science Center provides the Integrated Software for Imagers and Spectrometers (ISIS) software used to process the data from the Mercury Dual Imaging System (MDIS). Astrogeology is leading the international effort to combine the laser altimeter data and stereo images to produce the highest quality global topographic map of Mercury. This is the first time altimetry and stereogrammetry are being combined on a planetary scale.
http://astrogeology.usgs.gov/missions/messenger
Global topography of Mercury combining stereogrammetry and laser altimetry from the MESSENGER mission. Red areas are high elevation and blue areas are low elevation.