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

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Multivolume work

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

388 After 1986 the MEIS II sensor and operations facility were transferred to the private sector (Innotech Aviation Enterprises Limited of Montreal) where it is now being operated commercially (Till, 1987). Since becoming available for general use in 1983 demand for data from the MEIS sensor has been high for a variety of resource applications. Forestry agencies were early users of the system and have been and continue to be major users (Neville and Till, 1989). The MEIS imager uses the "pushbroom" scanning approach to image the earth’s surface. A linear multi-element array detector is located in the focal plane of an imaging lens. The distant scene is focused onto the array, and the signals generated by each element of the array are electronically sampled and digitized, to produce a line image in digital format of the scene below. As the aircraft moves forward, a new line is imaged and sampled, and as this process continues, two-dimensional imagery is built up, the aircraft motion providing the scanning in the forward direction. The spectral content of the imaged scene is selected by means of an optical filter placed in front of the lens. MEIS II has eight spatially registered imaging spectral channels, and incorporates sophisticated real-time processing to provide geometric and radiometric corrections to the output imagery. The digital imagery, navigation and system data are recorded on tape, for post-flight analysis and precision production. The system specifications are discussed in detail in a variety of papers ( McColl et al, 1984; Till et al., 1986a; Till et aL, 1986b). 3.2 MEIS FM The results of applications in forestry using the MEIS II sensor have generated considerable interest in the potential of a MEIS- based airborne system for forestry applications on an operational basis. As a result, plans are being developed to design and manufacture a new MEIS system (MEIS FM) for forestry operation (Neville and Till, 1989). The user requirements for the advanced linear array imager have been generated and system specifications have been prepared and matched to the operational survey needs of forestry agencies. MEIS FM (Multispectral Electro-Optical Imaging Sensor for Forestry and Mapping) will be a high resolution multispectral imager based on state-of-the-art linear array and high resolution optics designed specifically for the requirements of the forestry and mapping industries. The major components of the MEIS FM system, from data acquisition to product and information system interface, include the airborne system, the real-time processor/display and the ground processor. The later is being developed as a high performance data processing, analysis and map generation system based on a supercomputer and capable of producing stereo images, digital elevation models and topographic maps. 3.3 FLI History and Description The FLI (Florescence Line Imager), which is based on linear array technology similar to that of the MEIS sensor was developed by Moniteq Ltd. of Concord, Ontario in conjunction with Itres Ltd. of Calgary, Alberta for the Department of Fisheries and Oceans. The FLI system, also known as the Programmable Multispectral Imager (PMI) due to its unique ability to reconfigure its spectral bands, is a programmable imaging spectrometer and line imager that has been operating for various research studies since 1984. In 1986 a two year loan of the FLI to Moniteq was arranged, and this company has since made the instrument commercially available to remote sensing users (Gower, 1988). The FLI system evolved from a need to monitor ecological effects in lakes and coastal waters, and for determining water quality. This was accomplished by designing a system which could image ocean chlorophyll fluorescence and spectral reflectance change in water caused by phytoplankton (Hollinger et al., 1987). The FLI is an imaging spectrometer that makes use of a two-dimensional multi-element array of detectors in the focal plane of a dispersive optical system. Light from a swath line on the ground is collected by the objective lens, dispersed by a grating into a spectrum, and focused onto the array. The across-track spatial information falls along one dimension, and spectral information from each pixel is registered along the other dimension. The system can operate in two modes. In the "spatial mode", the system can perform high spatial resolution mapping by forming pushbroom images in 8 spectral bands. Alternatively in the "spectral mode", the system can provide low spatial resolution mapping in 288 spectral bands, with 40 pixels located across the swath. 3.4 CASI History and Description More recently the CASI (Compact Airborne Spectrographic Imager) system has been developed by Itres Ltd. as a downsized version of the FLI system. The CASI system is a personal computer sized second generation instrument which is flexible and portable. The real time display and data review on the instrument itself allows for easy checks of data quality, and combined with processing on personal computers facilitates rapid turnaround of data (Borstad et al., 1989). A unique feature of the CASI "spectral" mode is a co-registered monochromatic spatial image acquired at the same time as the spectral data. This image, termed the ‘track recovery

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