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:: Correction for Off-Nadir Viewing and Topographic Effects. Sunji Mural, Toshiaki Hashimoto

Document type:: Multivolume work

Structure type:: Chapter

804 in Los Angeles. The photos are arranged so that the terrain can be recognized by stereo scopy. Fig. 4 shows the distribution of geo metric distortion of the uncorrected image. 5. DTM Generation from SPOT Stereo Pairs For generating DTM from SPOT stereo pairs, it is necessary to determine precisely the position and attitude of sensor and to recognize conjugate points. The former is the problem of exterior orientation and the latter is that of stereo matching. Exterior orientation can be made by the same method described in chapter 2 and 3. Since SPOT HRV imagery is sensed with a linear array sensor, the equation (1) is modified into (8). x = 0 (8) y=(I-(N + l)/2)*d where d : interval of array element Other notations are the same as chapter 2. The position and the attitude of sensor can be expressed by monomials and by trinomials of line number J, respectively. Although it is necessary for precise orientation to get the sufficient number of GCPs from the whole area of imagery, plenty of remarkable points for GCPs may not exist in some areas. The algo rithm developed by the authors can utilize feature lines like roads, rivers or shorelines and the data of geodetic observations like slant distances or levels as control data. The methods of conventional stereo matching based on image correlation have the problem of accuracy and reliability. In order to improve this weakness, our algorithm adopts a triplet matching method. A conjugate point is searched under the constraint that three bundles should Intersect at a point as shown Fig. 5. The result of DTM generation is introduced. The test area is located on the mountainous area near Mt. Fuji. Fig. 6 shows the date and off-nadir angles of SPOT imagery. Fig. 7 and Fig. 8 shows contour image of actual DTM and that of measured DTM, respectively. The contour intervals of both images are 40m. The accuracy is the RMSE of 21m and the maximum error of 68m, which is more accurate and reiiabLe than that by a conventional method. 6. Concluding Remarks The summaries of the studies introduced in this paper are as foilows. The image distortions caused by off-nadir viewing can be corrected by the method based on photograinmetric principles. The distortions of SAR imagery can be corrected using DTMs. The DTM generation from SPOT stereo pairs are more accurate and reliable by the triplet matching method.

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