HYDROLOGY RESEARCH TOPOGRAPHIC MAPS VS. AIR PHOTOS

A cooperative program between the Maine Department of Transportation and the United States Geological Survey analyzed hydrologic data requirements for small watersheds. Of twenty-five instrumented Interstate highway structures between Augusta and Houlton, nine were selected for data comparison studies, relating and comparing watershed hydrologic parameters as determined from aerial photographs and U.S.G.S. topographic maps. While data for large to very large watersheds can be determined with acceptable accuracy from topographic maps, data for watersheds of less than one square mile must be derived from the stereoscopic interpretation and analysis of aerial photographs. Watersheds of less than one acre and up to 640 acres account for 85 percent of the drainage areas studied for Maine highway projects. Comparisons of the nine selected sites emphasize the difficulties and problems encountered in extracting small drainage basin parameter data from topographic maps. (Author)

• Corporate Authors:

  Maine Department of Transportation

  Materials and Research Division, Box 1208, Hogan Road
  Bangor, ME  United States  04402
• Authors:
  • Woodman, R G
• Publication Date: 1982-2

Media Info

• Features: Figures; Tables;
• Pagination: 33 p.

Subject/Index Terms

• TRT Terms: Aerial photography; Drainage basins; Hydrology; Information, data, and knowledge; Stereoscopic cameras; Topographic maps; Watersheds
• Uncontrolled Terms: Data needs
• Old TRIS Terms: Stereoscopic photography
• Subject Areas: Data and Information Technology; Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw;

Filing Info

• Accession Number: 00349505
• Record Type: Publication
• Report/Paper Numbers: Tech Paper 82-4
• Files: TRIS, STATEDOT
• Created Date: Sep 30 1982 12:00AM