Georectified Mosaic of Aerial Images of Baltimore City in 1927

Landscape analyses are typically done using spatially explicit color
aerial imagery. However, working with non-spatial black and white
historical aerial photographs presents several challenges that require
a combination of techniques and approaches. We analyzed 93 aerial
images covering 544 km2 (210 mi2) including all of Baltimore City, and
an area immediately adjacent to the city known at the time as the
Metropolitan District of Baltimore County. The images were taken from
a biplane between October 1926 and February 1927. High-resolution
scans were georeferenced and georectified against modern satellite
imagery of the area and then combined to create a single raster
mosaic. This process converted the images from a disparate set of
photographs into a spatially explicit GIS data set that can be used to
observe changes in land patches over time—and ultimately integrated
with other long-term social, economic, and ecological data.