What does DOQQ refer to?

DOQQ stands for Digital Orthophoto Quarter Quadrangle. This term refers to a type of aerial photograph that has been geometrically corrected (orthorectified) such that the scale is uniform across the image, meaning that it can be used as a map. The “quarter quadrangle” part of the name indicates that the image covers a quarter of a quadrangle, which is a specific area typically measuring 7.5 minutes of latitude by 7.5 minutes of longitude in the U.S. Geological Survey's mapping system.

DOQQs are utilized in various GIS applications because they provide accurate representations of geographic features, which can be integrated with other spatial data. The correction process allows for improved accuracy in measuring distances, areas, and performing spatial analysis, making DOQQs an essential resource for professionals involved in land use planning, environmental studies, and resource management.