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Forest Damage Survey for 1989 to 2010 for the North Pacific Landscape Conservation Cooperative, southern Alaska (a)

Summary

This data represents areas of forest damage due to insect infestation, fire, flood, landslides, windthrow and other mortalities. The information was collected by aerial surveys by both the USFS and ADNR, Div. of Forestry in cooperation with the Forest Health Protection (FHP) project. Surveys are conducted in July and August so that pest "signatures" may be obtained during the optimal period for symptom development of ocular estimation. The aerial survey is coordinated with known pest outbreaks so that the maximum extent of recent bark beetle damage (fading trees) and insect defoliation (discoloration, foliage loss) patterns may be determined. Aerial survey flights are termed as "local" if they can be completed within 1 day from the [...]

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southern_AK_forest_damage_1989_to_2010.sd 661.75 KB

Purpose

This data is collected to monitor the forest health for the State of Alaska and to locate insect and some disease pest trends. Accuracy and repeatability is not duplicatable due to the nature of aerial survey data collection. This data should be used as an initial identification of pest areas or landscape level planning but further surveys or ground truthing is necessary for area planning or management. More specific delineation of pest damage boundaries (polygons) may be obtained by later ground assessments or approximation of several individual years of mapping data. However, precise timing of the surveys for maximum symptom development is not always possible so that the aerial extent of damage generally cannot be accurately mapped for all pests. Also, many pest symptoms are delayed from the time of actual damage so that visual symptoms do not appear for several months after the initial damage. In the case of some bark beetle damage (e.g., spruce beetle) symptoms of "red-topped" or "fading red" trees do not show until the season after initial attack. Precise estimates of the extent of bark beetle damage often required a corroborative ground assessment to determine the extent of current season attacks. Also, some defoliator damage is not readily apparent from the air so that the actual extent (acreage) of damage cannot be accurately determined without extensive ground sampling

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ArcGIS Mapping Service

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Communities

  • LC MAP - Landscape Conservation Management and Analysis Portal
  • North Pacific Landscape Conservation Cooperative

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