2009 USDA Forest Service, Rocky Mountain Region Aerial Detection Survey Data. "Flown/ not flown" (r209_flown) feature class. This data depicts the spatial extent where the 2009 aerial detection survey took place. This data set is a companion to the r209_dmg data, which depicts the occurrence and location of 2009 forest insect, disease, and other biotic and abiotic causes of tree mortality and tree damage. The r209_flown data set provides information on which areas were surveyed, when the areas were surveyed, who the surveyors were (and their respective agencies), and what type of survey took place. Air turbulence, cloud shadows, distance from aircraft, haze, smoke, etc., which affect survey accuracies, may also be noted. A companion handbook entitled "Aerial Survey Geographic Information System Handbook" should be obtained before using this data set. The handbook is available online at: http://www.fs.fed.us/foresthealth/publications/id/gishandbook.pdf. This handbook also serves as a data dictionary necessary for deciphering field codes.
