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Data such as canopy cover or forest type may be derived for each polygon via satellite image processing or photo interpretation. Field crews may be sent to a selection of polygons to collect detailed data where individual trees are measured or down woody material is measured along transects. The amount and currency of data describing each vegetation polygon varies widely since it is cost-prohibitive to maintain detailed and current data for all polygons at any point in time. Data for some polygons may be more than 10 years old, while data for other polygons may have been collected yesterday. Typically where active project work or landscape analysis is occurring, better data is available since there is a need for good data for that area at that point in time. Data for polygons within the NRIS_VegPoly feature class is changing on a daily basis as data is updated by Forest Service staff. 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