Source:http://linkedlifedata.com/resource/umls/id/C0024779
NCI: A usually 2-dimensional diagrammatic representation of an object or area.,MSH: Works consisting of representations, normally to scale and on a flat medium, of a selection of material or abstract features on the surface of the earth. They may be used also in delineating the heavens and celestial bodies. (From Anglo-American Cataloguing Rules, 2d ed, p619)