BLM REA CYR 2013 Insect and disease survey flight paths from 2000 to 2014

Metadata Updated: November 12, 2020

Data on forest damage caused by insect and disease agents in the CYR study area was limited to the United States Department of Agriculture (USDA) Forest Service annual forest damage aerial surveys. Data on insect distribution and ranges within the CYR study area was identified as a data gap. The United States Department of Agriculture (USDA) conducted annual forest damage aerial surveys using fixed-wing aircraft along predetermined routes across Alaska’s forests, with up to 25% of the total forested area of Alaska surveyed each year. Insect damage within one to two miles on either side of flight paths was recorded by drawing polygons onto 1:250,000 scale USGS topographic maps or a digital elevation model. Some damage observations included an assessment of severity, which for this assessment was standardized to three categories: high (greater than 50% of trees/shrubs affected), moderate (approximately 50% of trees/shrubs affected), and low (less than 50% of trees/shrubs affected). Recorded damage polygons were necessarily noticeable from a flying aircraft, generally indicating that they were areas of at least 10% mortality or defoliation (Juday et al. 2005). Assuming that 3.2 km (2 miles) on either side of flight paths were surveyed, approximately 138,000 km2, or 52% of the area occupied by tree- and shrub-dominated CEs within the CYR study area, was surveyed from 2000 to 2014. Survey flight paths mostly followed riparian corridors, and major riparian corridors were surveyed with the highest frequency. Large, contiguous blocks of spruce, deciduous, and mixed forest were not surveyed from 2000 to 2014.

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License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Date October 13, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) June 15, 2016 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from DOI Open Data

Additional Metadata

Resource Type Dataset
Metadata Date October 13, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) June 15, 2016 (publication)
Responsible Party USDA Forest Service, State and Private Forestry (Point of Contact)
Contact Email
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Bbox East Long -141.00179622
Bbox North Lat 68.7536480743
Bbox South Lat 62.0096770372
Bbox West Long -163.83260984
Coupled Resource
Frequency Of Update notPlanned
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Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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