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:: [THP-5 IMAGE INTERPRETATION AND ANALYSIS]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: APPLICATION OF SHAPE-FROM-SHADING TECHNIQUES TO THE GENERATION OF "VALUE-ADDED" INTERPRETATION PRODUCTS OF SAR IMAGES OF RUGGED TERRAIN. B. Guindon

Document type:: Multivolume work

Structure type:: Chapter

735 APPLICATION OF SHAPE-FROM-SHADING TECHNIQUES TO THE GENERATION OF "VALUE-ADDED" INTERPRETATION PRODUCTS OF SAR IMAGES OF RUGGED TERRAIN B. Guindon Canada Centre for Remote Sensing 1547 Merivale Rd. Ottawa, Ontario, Canada K2G 4V3 ABSTRACT Spaceborne synthetic aperture radar (SAR) imagery is a useful information source for the understand ing of the large scale topography of rugged terrain because of its radiometric sensitivity to terrain orientation. Radiometric variability caused by changes in surface cover is generally a second-order effect. On the other hand, the unique SAR viewing geometry introduces spatial distortions (i.e. foreshortening and layover) which make it difficult to visually interpret physical shapes and sizes of topographic features. Because of the predominance of topographic effects in both image radiometry and geometry, a research program has been undertaken to assess the applicability of shape-from-shading techniques to the extraction of quantitative terrain information from images of rugged terrain. Recent analyses of SEASAT images (Guindon, 1989) have shown that radiometric response is an accurate indicator of the magnitude of the local range component of terrain slope. Based on this observation, a methodology has been developed which can provide both a digital elevation model (DEM) and a corresponding image orthoview from a single input SAR scene. At various stages during the DEM extraction process, image by-products can be generated which provide quantitative measures of specific terrain parameters (e.g. terrain slope maps, drainage network overlays). In addition, the DEM-orthoview combination can be subsequently employed to generate self-consistent image perspective views. In short, each product can be considered as some form of terrain interpretation, i.e. as a 'value- added' interpretation and thereby provide additional information for scene understanding. In this paper, the shape-from-shading methodology is briefly reviewed with emphasis on the deriva tion of 'value-added' products and their level of accuracy. Example results are provided for two SEASAT subscenes of mountainous terrain in central British Columbia. REFERENCE Guindon, B., 1989, Development of a Shape-from- Shading Technique for the Extraction of Topographic Models from Individual Spaceborne SAR Images. Proceedings of the 1989 International Geoscience and Remote Sensing Symposium, pp.597- 602.

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