Proceedings International Workshop on Mobile Mapping Technology

li, rongxing

Bibliographic data

Monograph

Persistent identifier:: 856671290

Author:: Li, Rongxing

Title:: Proceedings International Workshop on Mobile Mapping Technology

Sub title:: April 21 - 23, 1999, Bangkok, Thailand

Scope:: 1 Online-Ressource (Getr. Zählung [ca. 400 Seiten])

Year of publication:: 1999

Place of publication:: London

Publisher of the original:: RICS Books

Identifier (digital):: 856671290

Illustration:: Illustrationen, Diagramme, Karten

Language:: English

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

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:: Monograph

Collection:: Earth sciences

Chapter

Title:: [Session 3: Kinematic Real-time Positioning]

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: Airborne Mapping System with GPS-supported Aerotriangulation. Deren Li, Xiuxiao Yuan.

Document type:: Monograph

Structure type:: Chapter

3-5-8 By analyzing Table 2, the following conclusions can be drawn: 1) In Guangxi project, without any ground control point, the practical coordinate accuracy of combined bundle block adjustment with GPS-determined 3D coordinates of the camera positions are ± 11,072m for planimetry and ± 2.572m for height in the ground. Analyzing the residuals of the check points, we see that the remarkable systematic errors exist in GPS camera stations. In spite of the fact that the GPS camera coordinates possess certain systematic errors, yet the adjustment method has reached relatively high accuracy, which can meet the specification of topographic mapping at 1:50 000 scale. Consequently, it is feasible to update the topographic maps and topographic mapping at small or medium scale by GPS- supported aerotriangulation without ground control point. 2) If 4 ground full control points around the comers and a few elevation control points in two sides of the site are given, the coordinate accuracy of the GPS-supported bundle adjustment reaches 1.2a 0 ~3.6cr 0 for planimetry and 2.0a o ~4.4a o for height in the theory and 1.6a 0 ~4.3a 0 for planimetry and 1.7ct 0 ~3.1ct 0 for height in ground. The adjusted results are very closed to that of the conventional bundle adjustment with 3 additional parameters. Consisting of 4 XYZ ground control points near the comers of block area the model correcting the drift errors can be introduced into the combined bundle adjustment. The processing of combined bundle adjustment can automatically separate the systematic errors of the GPS camera positions and make them retain solely the accident errors. The residual accident errors can be distributed by the least squares method. Therefore, the accuracy of the bundle adjustment showed significant improvement. In this case, moreover, comparing with the conventional bundle adjustment, the work amount of field survey is reduced 88% and the production cost decreased 75% in the current standard of the cost accounting for Chinese photogrammetry. 3) The measuring accuracy of image point observations waves between ± \ \2fjm and±24.8//m, which depends upon aerophotographic quality. The GPS-supported aerotriangulation accuracy will be improved if a Q of image coordinates further reduces. 5. SUMMARY The above analysis and discussion have shown that the combined bundle adjustment with GPS-determined camera stations leads to an extension of the conventional bundle adjustment model without posing any major problems. The experiments show that introducing highly precise kinematic camera positions plus 4 XYZ ground control points into the combined bundle adjustment results in sufficient accuracy. Due to varying systematic errors the combined bundle adjustment computed without any ground control point will most probably be limited to low accuracy requirements. However, it is shown from the experiments that kinematic GPS relative camera positioning for aerotriangulation is a highly operational, robust and economic method which can thoroughly change aerial photogrammetry within a short time. ACKNOWLEDGMENTS This work would not have been possible without the help of many people and the support of many units. The authors would like to express their hearty gratitude to Professor Jiyu Liu and other research team members. We also want to explicitly thank China National Bureau of Surveying & Mapping, Wuhan Technical University of Surveying & Mapping, National Geomatics Center of China, China Siwei Surveying & Mapping Technology Corporation, China Aviation Remote Sensing Services Corporation, Tianjing Academy of Surveying & Mapping, Heilongjiang Bureau of Surveying & Mapping, Shanxi Bureau of Surveying & Mapping, Hainan Bureau of Surveying & Mapping and Sichuan Academy of Surveying & Mapping for their energetic support. In addition, this project is supported by Development Foundation of Surveying & Mapping, China National 863 Hi-tech Projects (No. 863-308-13-04(2)) and Natural Science Foundation of China (No. 49631050). REFERENCES [1] Ackermann, F., 1991. GPS for Photogrammetry, Proceedings of Tutorial on "Mathematical Aspects of Data Analysis ”, ISPRS, ICWG III/VI, pp. 17~70. [2] Forstner, W., 1988. The Reliability of Block Triangulation, Photogrammetric Engineering & Remote Sensing, 51(6): pp.l 137-1149. [3] Friess, P., 1991. Aerotriangulation with GPS-Methods, Experience, Expectation, Proceedings of 43 rd Photogrammetric Week, Stuttgart University. [4] Kubik, K., 1982. An Error Theory for Danish Method, Proceedings of the Symposium of Commission III of the ISPRS, Helsinki. [5] Li, D.R., and Yuan, X.X., 1995. GPS-supported Bundle Block Adjustment-An Empirical Results from Test Field Taiyuan (in Chinese), Acta Geodaetica et Cartographica Sinica, 24(2): pp.l~8. [6] Lucas, J.R., 1987. Aerotriangulation without Ground Control, Photogrammetric Engineering & Remote Sensing, 53(3): pp.311-314. [7] Wang, Z.Z., 1990. Principle of Photogrammetry (with Remote Sensing), Publication House of Surveying and Mapping, Beijing. [8] Yuan, X.X., 1994. GPS-supported Combined Bundle Block Adjustment Based on Differential Carrier Phase Observations (in Chinese), M.S Dissertation, WTUSM. [9] Yuan, X.X., 1995. The Processing of GPS System Offset On GPS-supported Bundle Block Adjustment (in Chinese), Journal of WTUSM, 20(3): pp.l 98-201. [10] Yuan, X.X., 1996. Correction of Earth Curvature in GPS- supported Bundle Block Adjustment (in Chinese), Journal of WTUSM, 21(3). [11] Yuan, X.X., and Li, D.R., 1997. Some Investigations for GPS-supported Aerial Triangulation (in Chinese), Acta Geodaetica et Cartographica Sinica, 26(1).

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