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Date: Thu, 11 Jul 2002 18:54:49 GMT
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Subject: Lewis and Clark Expedition GIS
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Lewis and Clark Expedition GIS

In order to mark the 200th anniversary of the Lewis and Clark Expedition, and to share the cartographic history of the exploration, approximately 30 of the most significant historical maps of the region from the David Rumsey Collection are now available on-line via the GIS Viewer at:    http://www.davidrumsey.com/

This visual voyage of discovery through the map history of the Lewis and Clark Expedition starts with pre-expedition maps of the early 1800's, then includes Lewis' original 1814 map of the expedition routes, next carries through to the first complete Government Land Office surveys of the late 1800's, then into the modern age 1970 National Atlas, and finally to the space age of satellite imagery. The David Rumsey GIS Viewer allows on-line visitors a unique opportunity to easily interact with, integrate, and visualize these historic maps along with the modern geospatial data from NASA, USGS, ESRI and GCS Research.

The modern geospatial data that can be overlaid and compared to the historical maps includes urban areas, transportation infrastructure (roads, rail), public land survey, lakes, parks, state boundaries, digital elevation models and satellite imagery. Users can create, save, and print custom maps, as well interactively blend/fade/merge and overlay/swipe multiple map layers for enabling real-time visual change analysis over the Internet. Results of the user customized map layer visualizations can be saved and downloaded as new images, complete with the georeferencing information, thereby allowing easy integration into other desktop GIS applications.


Phil Hoehn, Librarian
David Rumsey Collection
San Francisco
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http://www.davidrumsey.com
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