GMap provides planetary geological maps of different Solar System
bodies, developed by an open community, reviewed by scientists. GMap
inherits data model from Planmap, most of the maps provide
morphological information, some maps provide stratigraphic or
compositional information too. Each original data packages provided is
a collection of vector, raster, and, in some cases, 3D models. In this
EPN/TAP service, the data records (`granule_uid`) refer to each of the
data files in the whole of GMAP archive, grouped by (`granule_gid`)
the data package --map-- they compose.
