7.5 Minute Railroads for Los Fresnos, TX
Data Archive Technician National Park Service, NR-GIS Data Store. 2004. 7.5 Minute Railroads for Los Fresnos, TX. National Park Service Inventory and Monitoring Program
(USGS Text) Digital line graph (DLG) data are digital representations of cartographic information. DLGs of map features are converted to digital form from maps and related sources. Large-scale DLG data are derived from USGS 1: 20,000-, 1: 24,000-, and 1: 25,000-scale 7.5-minute topographic quadrangle maps. Large-scale DLG data are available in nine categories: (1) hypsography, (2) hydrography, (3) vegetative surface cover, (4) non-vegetative features, (5) boundaries, (6) survey control and markers, (7) transportation, (8) manmade features, (9) Public Land Survey System. The transportation category includes three sub-categories: Roads and Trails, Railroads, and Pipes and Transmission Lines. All DLG data distributed by the USGS are DLG - Level 3 (DLG-3), which means the data contain a full range of attribute codes, have full topological structuring, and have passed certain quality-control checks.
- Type
- Geospatial Dataset
- Authors
- Data Archive Technician National Park Service, NR-GIS Data Store
- Date of Issue
- 2004-10-04
- Publisher
- National Park Service Inventory and Monitoring Program
- Units
- PAAL
- Keywords
- Digital Line Graph, DLG, Railroads, Railroads By Quad, TX