Tuesday, November 22, 2011

Digital Ortho Quarter-Quads (DOQQ)

Color Infrared 1998: Part of Flowers NE (Johnston County)

Black & White 1993: Part of Flowers NE (Johnston County)
http://www.lib.ncsu.edu/gis/doqq.html
This is a Digital Ortho Quater-Quads, aerial images produced by USGS and contain orthorectified aerial photography at a resolution of 1 meter. This shows examples of a color infrared and a black and white photo. While the colored was taken in 1998, the black and white was taken in 1993 which is helpful in comparing the pictures, especially for an agency such as the EPA in order to determine erosion, deforestation, development, or water movement over time. 


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