Since cutting 'bug wood' has the highest current priority any detection and mapping procedure that will help discriminate new red attacked trees from older 'reds' has important implications for determining shelf life of the dead timber. These mapped mortality discriminations will assist with harvest planning and scheduling and will have implications for decisions involving timber yield and cost effective recovery of dead timber. Six areas of mountain pine beetle (MPB) infestation (to the west and southwest of Prince George) have been sequentially imaged, by the SFU Remote Sensing Laboratory, from April 2002 to October 2003 (with an additional single flight in April 2005). These sites were established by MoF as test sites for the evaluation of experimental remote sensing systems and procedures. The extent of MPB current attack, red attack and healthy trees was ground truthed (mapped) at the individual tree level by field examination in the fall and winter of 2001 and subsequently 2002. All new red attacked trees were identified on 2002 and subsequently on 2003 digital multispectral aerial photography of these sites. There is a clearly detectable difference between the new red attacked trees mapped in Aug/Sept 2002 and the previous red attacked trees identified by ground truth in Nov/Dec 2001(see Figure 1). This difference is quite distinct using four-band (B, G, R, NIR) multispectral imagery and it should transfer to applications using combined colour and colour IR aerial photography mapping packages. Such capability is available in the Canadian private sector aerial survey industry and could be implemented for competitive tendering. Our 2003 imagery for these same study sites confirms this discrimination of new vs. old reds. Clearly the next step is to determine strength of replication and potential to separate current (new) and earlier reds (as well as older grays). This requires a systematic replication study with new imagery in 2006 and 2007. This study involves the continuing acquisition and digital conversion of high-resolution multispectral (visible & near infrared), colour and infrared aerial photography for our six established study areas and a longer term study area that is cooler and wetter than the six selected test sites and site areas that were imaged in 2002/3. The selected site areas are part of the Dzitlainli Nation?s traditional territory. They contain sites in a protected area (Fleming) and Canfor TFL areas managed and logged by Canfor and Jan Cho Forestry Management. These areas are currently infested with MPB and this infestation is expected to continue to spread over the next two years. The site areas were selected in consultation with Canfor and Jan Cho with a consideration for longer term monitoring potential (unlikely to be completely over-run in the next year). The proposed research will involve flying: multispectral aerial photography in four spectral image bands: blue, green, red and near infrared. The specific spectral wavelengths will be adjusted with optical filters. A 'parallel' imagery data set that can be evaluated as a private sector, competitively-contracted, form of digital multispectral remote sensing image composites will include a twin camera set-up using synchronized mapping cameras to acquire normal colour and colour IR aerial and/or B&W IR photography. These synchronized images will be scanned and registered into 4 & 6 band multispectral images for enhancement, interpretation and classification. The flight frequency will be approximately every two weeks over the site areas. Imaging flights will commence in June 2006 and continue into late September, early October. This schedule will repeat in the next year for the same areas. Replication in the subsequent year is essential to this project as it will: (1) permit further refinement and verification of the discrimination procedures, and; (2) provide a controlled 2 year across-time imaging cycle for monitoring and mapping new and old r ...
Bone, Christopher, Dragicevic, Suzana; Roberts, Arthur; Northrup, James. 2007. Mountain Pine Beetle Red Attack Shelf Life Discriminations. Forest Investment Account (FIA) - Forest Science Program. Forest Investment Account Report. FIA2007MR248
Topic: FLNRORD Research Program
Keywords: Forest, Investment, Account, (FIA), Dendroctonus, Ponderosae, British, Columbia
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