BLM OR Wildfire Perimeter History Polygon

Abstract: FIRE_POLY: Fire History polygons represent the final mapped wildfire perimeter of all BLM fires 10 acres or larger across Oregon and Washington. In addition, wildfires smaller than 10 acres may be included along with many other non-BLM Federal and State agencies wildfires.

Purpose: This dataset is used to display historic wildfire perimeters on maps. The number and spatial extent of fire across the landscape is important information for natural resource management and planning activities. Fire perimeters will be combined with a wide variety of other GIS datasets including habitat and special management areas for effects and impact analyses.

Supplemental information: Data Standard is posted here: http://www.blm.gov/or/gis/data.php There is no lower size limit for fires to be included, although BLM does require capture of a final perimeter on fires 10 acres or larger in Type 1 (BLM land protected by BLM) and Type 2 (BLM land protected by another Federal agency under a cooperative agreement or contract; including mutual aid agreements) scenarios. Single tree ignitions and extremely small fires are generally omitted from FIRE_POLY and found only on FIRE_POINT. In addition, while FIRE_POINT contains fire origin points for most of the fires whose perimeters are included on FIRE_POLY, there are perimeters without a corresponding point; particularly for historic fires. It should be noted in the standard that the national standards (both BLM and Interagency) are being considered for revision and this standard should be considered interim until those updates occur.