The National Geospatial Digital Archive (NGDA) Collection Browser is a geospatial search engine for the collections of historical air photography, topolgical maps, and satellite imagery held at the Alexandria Digital Library (ADL) at UCSB's Map and Imagery Laboratory (MIL). The interface allows users to search by location and then to filter by a particular collection, keyword, and/or by date. The air photography collections cover most of California and date back as far as the 1920s. The topological maps also cover most of California. The Landsat satellite imagery spans the entire globe.

The NGDA Collection Browser was funded by the Library of Congress as part of the The National Digital Information Infrastructure and Preservation Program (NDIIPP). The NGDA Collection Browser was presented at Geoinformatics 2007.

[NGDA Collection Browser]
[Alexandria Digital Library serach engine]
[NGDA homepage]
[ADL homepage]
[NDIIP]
["Visually Browsing Georeferenced Digital Libraries" abstract]
[Geoinformatics 2007]