Ground surface elements, such as sand or lava, from the Physiology layer of the DCW. This data is part of the Digital Chart of the World dataset included with the Tobin Global Planner dataset. The National Imagery and Mapping Agency (NIMA) 2000 Digital Chart of the World (DCW) dataset is a GIS database at a 1:1,000,000 map scale. Global Planner contains DCW Release 5, dated September 2000. The original DCW dataset can be acquired for a nominal fee on the internet. Where necessary, Tobin converted the DCW data to the WGS84 Latitude Longitude datum and projection and to SHAPE (SHP) file format so that it could be overlaid on the topographic maps.