USGS DLG Data Sources and Currency
From USGS DLG Data Users Guide 3.
See also:
About the Map Viewer and
Details,
Frequent Questions.
APPENDIX I.--Data Sources and Currency
The published 1:2,000,000-scale National Atlas sectional maps
were completely revised in 1972-73. Selected information from
these maps was revised before digitizing. The source and date of
the updated information
are presented below:
- Category
- Source [Currency of Data]
- Political Boundaries, Alaskan borough boundaries
- Bureau of the Census [1979]
- Administrative Boundaries
- Administering Federal agency [Various]
- Roads and Trails
- Various [1980]
- Railroads
- Interstate Commerce Commission [1979]
- Streams, Alaska
- Landsat imagery [1979]
- Water Bodies, major reservoirs
- National Oceanic and Atmospheric Administration Sectional Aeronautical Charts [1979-80]
- Cultural Features, airports
- Federal Aviation Administration [1980]
- Alaska pipeline
- USGS maps [1979]