Proceedings of the Symposium on Global and Environmental Monitoring: Proceedings of the Symposium on Global and Environmental Monitoring

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Persistent identifier:: 856665355

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts ; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856665355

Language:: English

Document type:: Multivolume work

Volume

Persistent identifier:: 856669164

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Scope:: XIV, 912 Seiten

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856669164

Illustration:: Illustrationen, Diagramme, Karten

Signature of the source:: ZS 312(28,7,1)

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [WP-3 FOREST INVENTORY APPLICATIONS]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: EVALUATING AIRBORNE LINEAR ARRAY TECHNOLOGY FOR OPERATIONAL FOREST INVENTORY APPLICATIONS IN BRITISH COLUMBIA. Paul G. Pilon

Document type:: Multivolume work

Structure type:: Chapter

image’, is a high spatial resolution monochromatic reference image which permits the spectral data to be accurately located with respect to targets on the ground. This ability to act as a spectrometer and imaging device at the same time greatly facilitates acquisition of high quality spectral data which are accurately geo-located. 4.0 FORESTRY APPLICATIONS Airborne linear array imagers can be used for a variety of forestry applications to provide forest information in a more efficient and cost- effective manner: 1) as an alternative to aerial photography for forest inventory, 2) for mapping of major forest changes (e.g. clearcuts, burned areas), 3) for assessing insect and disease damage, and 4) for providing sample data for various forestry applications. To meet these requirements, a airborne linear array system must provide efficient cost-effective area coverage and efficient data processing. 4.1 Forest Inventory Forest inventories are the basis for the management of British Columbia’s forest resource. The Province’s forests cover an area of approximately 52 million hectares, contain close to 8 billion cubic metres of merchantable timber and represent over 40 percent of the country’s timber supply. The Province’s forest inventory database is currently reinventoried on a ten year cycle using large-scale aerial photography as the primary information source. Between reinventories the database is updated on a regular basis for major disturbances and new harvesting activity using Landsat Thematic Mapper (TM) imagery. Forest inventory mapping for management purposes requires the delineation and description of forest stands on the basis of species composition, density, age and height. In order to accomplish this, it must be possible to discern and interpret individual trees (implying resolution of less than 1 meter), and high quality stereo imagery must be available. Research has demonstrated that high resolution airborne imagery can provide such detail (Gougeon and Moore, 1988). The advantages of linear array imagers for forest inventory are large when a GIS infrastructure is in place. Linear array imagers through the use of optimized wavelength bands and optimized enhancements will likely provide forest typing of equivalent or perhaps better accuracy than conventional aerial photography but with a greater ease of interpretation due to the digital nature of the data. The major benefits will result from the impact on the total inventory production system, particularly the cost savings of integrating the data and interpretation directly with existing data on a GIS. This eliminates the costly process of transferring interpretation onto a map base. 4.2 Mapping Forest Change The capability to efficiently geometrically correct linear array imager data and superimpose multiple dates of imagery makes such data suitable for mapping forest change and for directly updating forest inventories on a GIS. Major changes such as clearcuts and many burned areas, which may require only delineation and no quantification of levels of change can be easily detected and delineated by single or multi-date high level linear array imager data (Robertson and Nesby, 1986). If operational post-flight processing facilities can be developed it is possible that near real-time airborne imagery can acquired and be used for highly time-sensitive applications such as monitoring forest fires or insect migrations. 4.3 Insect and Disease Damage Assessment Insect damage surveys are necessary for planning control strategies, for assessing the effectiveness of control strategies, for planning harvest schedules and salvage logging, and for predicting timber losses which are likely to be incurred. For damage assessment, the main need is for accurate assessments and geographic placement of damage levels over large areas. Airborne linear array data at a spatial resolution of approximately 5 m over a wide swath could be used for insect damage surveys. The use of narrow wavelength bands (5 to 10 nm) is important for identifying affected areas at the earliest possible stage of infestation. Recent experiences of forest insect infestations and their resulting impact highlight the requirement for efficient and accurate methods of assessing insect and disease damage. Large areas would have to be covered, generally on an annual basis. In western Canada, for example, over one half million hectares are effected by mountain pine beetle damage involving over 8,000 infestations. Kneppeck and Ahern (1989) found that MEIS data at 1.4 m resolution was able to detect 1.36 times as many red attacked trees as were detected on 1:10,000 natural colour photography. Ahern (1988) concluded that airborne linear array data should be able to detect bark beetle stress in conifers long before the red attack stage by acquiring narrow band imagery in the red edge spectral region. Sketch mapping, the most common technique used for mapping damage is expensive and inappropriate for broad area estimates of damage. Increasingly, however, there is a demand for defoliation assessment on a stand basis so that damage information can be used more effectively 389

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