Planetary and satellite maps published by the USGS have alphabetical terms in the designator code that define the type of base used for map compilation. Definitions of these codes are listed below. Because these codes have evolved over the years, those on early maps are not entirely consistent with those on later ones. This system was not used for lunar maps published by the DMA, but we have added the terms to their entries to facilitate sorting and comparisons of the lists. AN - Airbrushed rendition combining shaded relief, albedo markings, or other data.
Nomenclature is included.
CM - Controlled photomosaic. OM - Orthophotomosaic. OMT - Orthophotomosaic with nomenclature and contour lines. RN - Shaded relief with nomenclature. UM - Uncontrolled photomosaic.