(Clockwise from top) Nathan Piekielek, head of the Donald W. Hamer Center for Maps and Geospatial Information at Penn State University Libraries, has developed an efficient computer workflow to convert digitized archival aerial photographs (such as the one at bottom right) into geospatial data that is compatible with modern mapping and research tools. Piekielek tested and refined the workflow with help from student assistants (bottom left).
Credit: Photos provided by Nathan Piekielek