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ROADS AND TRAILS General Description The ROADS coverages provide a digital representation of the roads and trails 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 GRANIT data layers. 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. The streamlined set of attributes describes the road type (e.g. primary route, secondary route, class 3 or 4 road, etc.). The availability of the GRANIT id allows users to link back to the original full attribute list, if so desired, to generate additional data. In addition to the data documented above, statewide coverage of DLG-derived roads and trails generated at 1:100,000 is available. This data may be used for large area, regional analyses. Primary Cover Name: ROADSnnn Cover Content: ROADS AND TRAILS 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: 7.5-MINUTE QUADRANGLE Associated Coverages: ROADSNHANNO (point coverage consisting of route types, route numbers, and limited annotation) Data Layer Last Revised: May, 1993 |
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