This presentation was given by Nordica Holochuck, New York Sea Grant, and Susan Hoskins, Cornell Institute for Resource Information Sciences, during Teaching the Hudson Valley's 2009 Summer Insitute.

22. A geological party on its way to map the
Cripple Creek mining district, Colorado, 1893.
Planetable surveying by
turn-of-the-century USGS
topographers

24. USGS 15’ Topographic Map
Tarrytown, 1902

25. Aerial cameras mounted in aircraft

26. US Geological Survey
Topographic Map Series
Extent:
7.5 minutes latitude and
longitude
Scale:
1:24,000 (1”=2,000’)
Features:
Themes – boundaries, buildings,
transportation, water, vegetation
Contours – elevation
Nyack, NY 1967, PR 1979

57. Current Maps
USGS
http://topomaps.usgs.gov/
NYS GIS Clearinghouse
http://nysgis.state.ny.us/gisdata/quads/
Private Vendors
See USGS website
Map Repository Libraries

58. Historic Maps
USGS
http://topomaps.usgs.gov/
University of New Hampshire
http://docs.unh.edu/nhtopos/nhtopos.htm
Google Earth
http://www.gelib.com/historic-topographic-maps
Map Repository Libraries

59. Current Airphotos
OasisNYC
http://oasisnyc.net/
NYS GIS Clearinghouse
http://nysgis.state.ny.us/gateway/mg/
USGS
http://seamless.usgs.gov/

60. Historic Airphotos
USGS EROS Data Center
http://earthexplorer.usgs.gov
USDA Aerial Photography Field Off.
http://www.fsa.usda.gov
National Archives
http://www.archives.gov/