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RAILROADS General Description The RR coverage provides a digital representation of the railroads mapped on standard 7.5-minute USGS quadrangles. The data was distributed by the USGS in Digital Line Graph (DLG) format. It was then processed in ARC/INFO to generate the GRANIT data layer. The processing involved a series of steps, including assigning a GRANIT id to each feature and refining/streamlining attributes. The modifications were made in conformance with standards adopted by the NH GIS Advisory Committee. As indicated on the status map, full coverage of the state is now available through the GRANIT database. Modifications, updates, and enhancements to the spatial and attribute data will continue to be made. In addition to the data documented above, statewide coverage of DLG-derived railroads generated at 1:100,000 is available. This data may be used for large area, regional analyses. Primary Cover Name: RRNH Cover Content: RAILROADS Cover Type: LINE Source: DIGITAL LINE GRAPHS, USGS Source Scale: 1:24,000/1:25,000 Source Media: DIGITAL Automated By: US GEOLOGICAL SURVEY Coordinate Reference: NH State Plane Feet Horizontal Datum: 1983 Tile: STATE Data Layer Last Revised: January, 1993 |
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