Digital USGS Quadrangle Sheets
- The Digital Quadrangle Template is used as the index layer for the QUAD and QUAD2 libraries at MassGIS, which store1:25,000 U.S. Geological Survey's Digital Line Graph (DLG)-based data. This digital quadrangle template comprises 211 quadrangles. The grid differs from the Quadrangle Template, which is based on the 1:25,000 USGS 7.5 minute topographic quadrangles and used for paper maps. For most of Massachusetts, though, the paneling schemes are identical. The quadrangle panels and numbering scheme vary along the coast, primarily for the Cape and Islands quads. In ArcSDE the layer is named USGSGRID_POLY.
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