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:: [FA-1 TOPOGRAPHIC ANALYSIS]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: PRECISE GEOMETRIC PROCESSING OF STEREO MEIS IMAGERY. J. R. Gibson, M. Buchheit

Document type:: Multivolume work

Structure type:: Chapter

791 PRECISE GEOMETRIC PROCESSING OF STEREO MEIS IMAGERY J.R. Gibson Canada Centre for Remote Sensing M. Buchheit 1 Prologic Systems Limited Abstract This paper discusses the considerations involved in preparing and processing electro-optical stereo imagery from an airborne Multi-detector Electro-optical Imaging Scanner known as MEIS for input into Geographic Information Sys tems for Remote Sensing analysis or other interpretative applications. MEIS was built by Macdonald, Dettwiler and Associates for the Canada Centre for Remote Sensing (CCRS) and has been evaluated extensively over the past several years. The MEIS was subsequently modified by CCRS to have a stereo imagery acquisition mode by adding external mirrors to create both a forward-looking and an aft-looking channel. These two channels operate simultaneously to provide single-pass stereo coverage. Due to the limited swath width of the present MEIS instrument, it is frequently necessary to fly several parallel flight lines in order to obtain coverage of a desired test area. This paper outlines the procedures that are followed in building up a composite imagery mosaic of the coverage area based on several individual flight lines. The adjustment of the imagery to ground control points is based on rigorous photogrammetric techniques involving the Collinearity and Coplanarity Conditions for the MEIS imager and implicit use of data from the associated inertial navigation system. The adjustment allows for the simultaneous solution of multiple input flight lines and is able to accommodate both fore/aft and side to side stereo imagery. The system computes a low order polynomial estimator to model the errors of the inertial navigation system data and then adjusts the position and attitude data after the best fit to the control points has been achieved. The corrected position data may then be used in the subsequent geometric processing of the imagery. Some of these processing stages include: The removal of terrain height distortions necessary for the generation of ortho-imagery; a simple radiometric balancing necessary before an imagery mosaic may be made and in the future; generation of terrain height data from the forward and aft looking channels. The paper summarizes the results of several accuracy evaluations of the fit of imagery to ground control points. There is also a sample of an ortho-imagery mosaic to illustrate the effects of the correction processing. Key Words: electro-optical, stereo, imagery, MEIS, geometric correction, photogrammetric, mosaic 1 Introduction The purpose of this paper is to describe the current state of the geometric correction and resampling software at the Canada Centre for Remote Sensing (CCRS) for the digital imagery obtained from the Multi-detector Electro- optical Imaging Scanner (MEIS). The acceptance of air borne scanners has been slow over the years principally because of poor spatial resolution and distortions induced by aircraft motion. However with the developments th«Vt 'Under contract to CCRS have taken place in imaging technology, where both the spatial and radiometric resolutions have improved dra matically, and at CCRS in the measurement of aircraft motion and in the development of data processing al gorithms for post-flight correction of the imagery, these problems are close to being solved. In particular, a new prototype imager has been built at CCRS with 6000 pix els, 12 bits of radiometric resolution and a field of view of 70 degrees (Neville, 1989). During this same time, changes have been occurring in

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