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Learn about the La. Historical Map Georeferencer

A crowdsourcing platform for georeferencing content from the Sanborn maps collection at the Library of Congress.

Work in Progress

This site is still under construction and a bit fragmented. Please be patient!


Volume Management

A Volume Summary page aggregates all sheets from a Sanborn map edition (or volume) for an overview of georeferencing progress.


Architectural Detail

Sanborn map sheets contain extensive information about every building at a very large scale (1:100 or 1:200).


Geospatial Layers

Users will georeference map sheets one-by-one, eventually creating a continuous mosaic out of the volume.


Explore the Mosaics

The mosaics can be used in web maps, as below, to provide a window to what American cities looked like at the turn of the 20th century.