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- W295037310 abstract "Fire-suppression over the past century has led to i ncreased forest density and fuel accumulation. Incr eased stand densities and warm dry summers in the past few decades have predisposed dry, high elevation forest typ es to mountain pine beetle (MPB) outbreaks. MPB outbreaks occur in three successive stages— the green (init ial attack), red (visible attack), and gray (dead) stages. With the use of geospatial technology, these outbreaks c an be better mapped and assessed to evaluate forest health. Fiel d work on seventeen randomly selected sites was conducted using the point-centered quarter method. The stratified r andom sampling technique ensured that the sampled trees were representative of all classifications present. Addi tional measurements taken were soil nutrient concen trations (sodium [Na + ], nitrate [NO 3 ], and potassium [K + ]), soil pH, and tree temperatures. Finally, satell ite imagery was used to define infestation levels and geophysical p arameters—such as land cover, vegetation classifica tion, and vegetation stress. ASTER images were used with the Ratio Vegetation Index (RVI) to explore the differe nces in vegetation, while MODIS images were used to analyze the Disturbance Index (DI). Four other vegetation indices from Landsat TM5 were used to distinguish the green, red and gray phases. Selected imagery from the Hy perion sensor was used to run a minimum distance supervised classification in ENVI, testing the ability of Hy perion imagery to detect the green phase. The National Ag ricultural Imagery Program (NAIP) archive was used to generate accurate maps of beetle-infested regions." @default.
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- W295037310 date "2010-12-01" @default.
- W295037310 modified "2023-10-01" @default.
- W295037310 title "A GEOSPATIAL ASSESSMENT OF MOUNTAIN PINE BEETLE INFESTATIONS AND THEIR EFFECT ON FOREST HEALTH IN OKANOGAN-WENATCHEE NATIONAL FOREST" @default.
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