The first topographic map of Mercury was released by the U.S. Geological Survey, Arizona State University, Carnegie Institute of Washington, Johns Hopkins University Applied Physics Laboratory and NASA on May 6, 2016.
Here it is in the highest resolution obtainable mapped onto a sphere.
Map source:
http://astrogeology.usgs.gov/search/map/Mercury/Topography/MESSENGER/Mercury_Messenger_USGS_ClrShade_Global_2km
Color scale: http://www.nasa.gov/sites/default/files/thumbnails/image/messenger_dem_may2016.jpg