The Digital Aerial Photo Archive (DAPA) was created to preserve historical aerial photography for all of Ramsey County. Scanned photos are given a coordinate system though a process called orthorectification, allowing them to be used by Geographic Information System (GIS). Before DAPA, aerial photos were subject to damaging misuse, resulting in ink marks, tears, and theft.
The photo series chosen for this project are 1940, 1953, 1974, and 1985.
The methodology for DAPA was developed through a pilot project funded by the City of Roseville, Capitol Region Watershed District, and Ramsey SWCD.
DAPA is funded jointly by the Ramsey SWCD and the Ramsey County GIS Users Group.