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Title: Assessing insect-induced tree mortality across large areas with high-resolution aerial photography in a multistage sample

Author: Hamilton, Randy; Megown, Kevin; Ellenwood, James; Lachowski, Henry; Maus, Paul.;

Date: 2010

Source: In: Pye, John M.; Rauscher, H. Michael; Sands, Yasmeen; Lee, Danny C.; Beatty, Jerome S., tech. eds. Advances in threat assessment and their application to forest and rangeland management. Gen. Tech. Rep. PNW-GTR-802. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest and Southern Research Stations: 571-580

Publication Series: General Technical Report (GTR)

   Note: This article is part of a larger document. View the larger document

Description: In recent years, unprecedented tree mortality has occurred throughout the national forests owing to insect infestations and disease outbreaks. The magnitude and extent of mortality, coupled with the lack of routine monitoring in some areas, has made it difficult to assess the damage, associated ecological impact, and fire hazard in a timely and cost-effective manner. To aid forest managers in assessing the damage, a cost-effective multistage sampling method, using high-resolution digital aerial photography, was developed to estimate overall mortality across large areas. The method was tested within a 332,000-acre piñon/juniper woodland west of Flagstaff, Arizona, within the Kaibab National Forest. Piñon pine mortality caused by piñon ips bark beetles (Ips confusus (LeConte)) was assessed from high-resolution digital aerial imagery within percent-cover strata with the use of a digital dot grid. The sample revealed that dead trees covered 7.0 ± 0.3 percent of the study area. As a percentage of total tree cover, 20.0 ± 0.8-percent mortality had occurred. The cost to obtain this estimate was approximately $0.04 per acre.

Keywords: Dot grid, imagery, Ips confusus, pinyon, remote sensing, sample.

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Citation:


Hamilton, Randy; Megown, Kevin; Ellenwood, James; Lachowski, Henry; Maus, Paul. 2010. Assessing insect-induced tree mortality across large areas with high-resolution aerial photography in a multistage sample. In: Pye, John M.; Rauscher, H. Michael; Sands, Yasmeen; Lee, Danny C.; Beatty, Jerome S., tech. eds. Advances in threat assessment and their application to forest and rangeland management. Gen. Tech. Rep. PNW-GTR-802. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest and Southern Research Stations: 571-580.

 


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