The WAC Digital Terrain Model (DTM) was constructed from WAC stereo images. This new map is called the Global Lunar DTM 100 m topographic model, or "GLD100", and covers 98.2% of the lunar surface. Using digital photogrammetric techniques the GLD100 was computed from 69,000 WAC stereo models. Due to persistent shadows near the poles it is not possible to create a complete WAC stereo map at the very highest latitudes. The GLD100 thus covers from 79° S latitude to 79° N latitude. Since the stereo correlation box is bigger than 100 meters, surface details at the 100-meter scale are not fully resolved. However, each 100-meter square has an average of 26 stereo points within it (for a planet-wide total of 100 billion points), which helps to sharpen the elevation estimate. The resolution, in a formal sense, is probably close to 300 meters, and the accuracy of the elevations is estimated to be about 10 to 20 meters (Scholten et al JGR in press).
The GLD100 is available in the original 100 meters/pixel scale format in ten tiles. The GLD100 is also available in same tile format for scales of 256 pixels per degree (ppd) and 128 ppd. The LRO Lunar Orbiter Laser Altimeter (LOLA) excels at characterizing the topography of the poles. Since the LRO orbits converge at the poles LOLA provides a very high resolution topographic model of the poles. For the 256 ppd and lower resolution formats the LOLA polar data fills in the WAC "hole at the pole".
The WAC topography was produced by LROC team members at the German Aerospace Center (DLR).