library of congress


Maps and Cartography

Where to Look for Historical Maps

The use of extracting data from old paper maps is growing in popularity as a method to understanding historical geography.  David Ramsey popularized the method of georectifying historical maps and draping those maps over a DEM to create a 3D view.    Pastmapper is a project that digitizes historical maps in […]

GIS Learning

Geospatial Data Preservation

Geospatial Data Preservation

The Library of Congress and Columbia University are teaming up to create a a web-based clearinghouse with the purpose of providing information about preserving geospatial data.  The Library of Congress’ National Digital Information Infrastructure and Preservation Program will fund the development of the clearinghouse which will be hosted at Columbia’s […]