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Map Name: Forest_Health_Aerial_Survey_2023

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Description: Every summer for the past seventy-six years, an insect and disease aerial detection survey has been flown over all forested acres in Washington state (except where noted in the digital data by large 'NF' (not flown) areas). This survey is a cooperative effort between the U.S. Forest Service and the WDNR where two trained aerial surveyors sit on either side of a high-wing plane and sketch forest damage observed below. The primary mission of the survey is to record recently killed and defoliated groups of trees throughout the state, and to continually build a historical record of forest health trends. The majority of damage found is caused by insect and disease damage agents; however, trees killed by root disease and early spring feeding of black bears, or by abiotic events such as winter storms, fires, floods and landslides are recorded as well. Current defoliation can be detected as soon as the affected foliage changes color that year. However, whole tree mortality is not current since only flagged trees (i.e., trees which have a bright red, orange, or yellow foliage color) are recorded. This means that trees killed the year of the survey will not have changed color yet and a one-year lag time results. Only trees exhibiting distinctive colors or "signatures" are documented. For example, when bark beetle damage is spotted while surveying, a polygon is drawn on a digitized map of the size and location of the damage. The polygon is then labeled with the appropriate damage agent (i.e., code: 8 for Western pine beetle) and the percentage of trees affected within five damage severity categories. It is an educated guess as to the causal agent. We therefore use ground surveys to reinforce our estimates as much as possible. No vertical data is recorded.

Service Item Id: 4935a6ec4deb4b958faf64627c86593c

Copyright Text: This data is a result of a cooperative effort between USDA Forest Service, Region 6, Forest Health Protection and the Washington State Department of Natural Resources, Forest Resilience Division, Forest Health. Layer Credit: Isaac Davis, Forest Health Specialist & Aerial Observer | isaac.davis@dnr.wa.gov | (360) 277-6738

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Document Info:

Title: Forest_Health_Aerial_Survey_2023
Author:
Comments: Every summer for the past seventy-six years, an insect and disease aerial detection survey has been flown over all forested acres in Washington state (except where noted in the digital data by large 'NF' (not flown) areas). This survey is a cooperative effort between the U.S. Forest Service and the WDNR where two trained aerial surveyors sit on either side of a high-wing plane and sketch forest damage observed below. The primary mission of the survey is to record recently killed and defoliated groups of trees throughout the state, and to continually build a historical record of forest health trends. The majority of damage found is caused by insect and disease damage agents; however, trees killed by root disease and early spring feeding of black bears, or by abiotic events such as winter storms, fires, floods and landslides are recorded as well. Current defoliation can be detected as soon as the affected foliage changes color that year. However, whole tree mortality is not current since only flagged trees (i.e., trees which have a bright red, orange, or yellow foliage color) are recorded. This means that trees killed the year of the survey will not have changed color yet and a one-year lag time results. Only trees exhibiting distinctive colors or "signatures" are documented. For example, when bark beetle damage is spotted while surveying, a polygon is drawn on a digitized map of the size and location of the damage. The polygon is then labeled with the appropriate damage agent (i.e., code: 8 for Western pine beetle) and the percentage of trees affected within five damage severity categories. It is an educated guess as to the causal agent. We therefore use ground surveys to reinforce our estimates as much as possible. No vertical data is recorded.
Subject: The Department of Natural Resources uses this data to describe the location and intensity of forest disturbance activity on an annual, statewide level. These data are used for maps and analysis for suppression and salvage planning, and for monitoring historical trends.
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Keywords: Pacific Northwest
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