RDW_ForestEcology/National_Snag_Hazard (ImageServer)

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Service Description: Updated February 2024. Snags continue to pose an ever-present hazard to responders, and recent increases in fire activity have resulted in an accumulation of these hazards across forested landscapes of the American West. National Snag Hazard is intended to provide a landscape-level view of existing snag hazard to firefighters and other field going employees. National Snag hazard is based on estimated density and median height of snags greater than or equal to 7.9 inches in diameter at breast height. Snag density and median snag height are classified into hazard levels using the breakpoints from Dunn et al. 2019, which are based on the logic that hazard increases with snag density and height. Dunn CJ, O?Connor CD, Reilly MJ, Calkin DE, Thompson MP (2019) Spatial and temporal assessment of responder exposure to snag hazards in post-fire environments. Forest Ecology and Management 441, 202-2014. DOI:10.1016/j.foreco.2019.03.035 This is a strategic landscape level decision support tool intended to help firefighters consider the magnitude and spatial distribution of snag hazard in their incident response strategy planning. Valid uses include identifying areas of higher snag hazard locations on landscape that may require extra mitigation for safe operation or could be avoided to reduce risk to responders. The snag hazard map is not meant to identify individual dead trees or for tactical planning. A rating of low snag hazard does not mean that no overhead hazards are present and should not be interpreted as judgement that an area is safe to occupy. Conditions should always be verified in the field. High levels of awareness for overhead hazards are always recommended regardless of the snag hazard rating. The geospatial data product described here provides foundational information which address the Risk Management Principles described in Forest Service Manual 5131. FS Manual 5131 - Wildfire Doctrine and Principles 5131.3 - Risk Management Principles The wildfire response environment is complex, presenting significant effects on public health and safety, and possesses inherent hazards that can result in harm to firefighters engaged in wildfire response operations, even with reasonable mitigation. 1. The Forest Service is committed to the aggressive management of risk. 2. Apply a risk management process to minimize the exposure and effects of the inherent hazards in wildfire response while maximizing the opportunities to achieve management objectives. 3. Maintaining state of the art decision support systems based on the best available science is essential for making sound decisions on how to manage all wildland fire to achieve Land Resource Management Plan objectives, including public and Agency personnel safety.

Name: RDW_ForestEcology/National_Snag_Hazard

Description: Updated February 2024. Snags continue to pose an ever-present hazard to responders, and recent increases in fire activity have resulted in an accumulation of these hazards across forested landscapes of the American West. National Snag Hazard is intended to provide a landscape-level view of existing snag hazard to firefighters and other field going employees. National Snag hazard is based on estimated density and median height of snags greater than or equal to 7.9 inches in diameter at breast height. Snag density and median snag height are classified into hazard levels using the breakpoints from Dunn et al. 2019, which are based on the logic that hazard increases with snag density and height. Dunn CJ, O?Connor CD, Reilly MJ, Calkin DE, Thompson MP (2019) Spatial and temporal assessment of responder exposure to snag hazards in post-fire environments. Forest Ecology and Management 441, 202-2014. DOI:10.1016/j.foreco.2019.03.035 This is a strategic landscape level decision support tool intended to help firefighters consider the magnitude and spatial distribution of snag hazard in their incident response strategy planning. Valid uses include identifying areas of higher snag hazard locations on landscape that may require extra mitigation for safe operation or could be avoided to reduce risk to responders. The snag hazard map is not meant to identify individual dead trees or for tactical planning. A rating of low snag hazard does not mean that no overhead hazards are present and should not be interpreted as judgement that an area is safe to occupy. Conditions should always be verified in the field. High levels of awareness for overhead hazards are always recommended regardless of the snag hazard rating. The geospatial data product described here provides foundational information which address the Risk Management Principles described in Forest Service Manual 5131. FS Manual 5131 - Wildfire Doctrine and Principles 5131.3 - Risk Management Principles The wildfire response environment is complex, presenting significant effects on public health and safety, and possesses inherent hazards that can result in harm to firefighters engaged in wildfire response operations, even with reasonable mitigation. 1. The Forest Service is committed to the aggressive management of risk. 2. Apply a risk management process to minimize the exposure and effects of the inherent hazards in wildfire response while maximizing the opportunities to achieve management objectives. 3. Maintaining state of the art decision support systems based on the best available science is essential for making sound decisions on how to manage all wildland fire to achieve Land Resource Management Plan objectives, including public and Agency personnel safety.

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Copyright Text: College of Forestry, Oregon State University; Rocky Mountain Research Station, US Forest Service; Department of Biological Sciences, Humboldt State University

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Child Resources: Info Histograms Statistics Key Properties Legend Raster Function Infos

Supported Operations: Export Image Query Identify Compute Histograms Compute Statistics Histograms Get Samples Compute Class Statistics Query Boundary Compute Pixel Location Compute Angles Validate Project