Proceedings of the Symposium on Progress in Data Processing and Analysis

Bibliographic data

Monograph

Persistent identifier:: 856470848

Title:: Proceedings of the Symposium on Progress in Data Processing and Analysis

Sub title:: September 8 - 12, 1990, Dresden, GDR

Scope:: 1 Online-Ressource (396 Seiten)

Year of publication:: 1990

Place of publication:: Berlin

Publisher of the original:: Kammer der Technik

Identifier (digital):: 856470848

Illustration:: Illustrationen, Diagramme

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:: [S 3 Analytical Instruments (WG II / 1)]

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: Digital Photogrammetric Applications with the Prime-Wild S9 Analytical Plotter. David Wilkins

Document type:: Monograph

Structure type:: Chapter

42 concern aspects of the hardware - all calibration procedures on the S9AP already run automatically. This concerns more the quality control aspects of obtaining good points. Two methodologies used in this investigation would be difficult to implement in an automated system: adjustment of the video digitisation gain and offset, and the selection of best matching parameters. The former may always be a problem, due mainly to the density range in aerial photography. However in this case it was necessary due mainly to the poor contrast exhibited by many of the signalised points used. In a semi-automatic procedure the points to be matched will in general be natural tie-points instead of signalised points. Images in the appropriate positions in the model can be acquired (eg at the von Gruber points) and the tie-points selected automatically based on what image signal there is. The Digital Comparator Correlator System (DCCS) from Helava Associates Inc employs techniques along these lines in its procedures for semi-automatic triangulation (Helava, 1988). The need to select best matching parameters was also a direct consequence of the signalisation - badly defined points are difficult to match with template matching. This would also to some extent be relieved by the use of natural tie-points: in general, good signal content equates to suitability for matching. If a constant parameter set is used, it may be easier to pick out any failures that do occur, whereupon alternative points could then be selected on-line. It may still be necessary to match signalised points, in which case a higher quality signalisation is required, or the development of supporting or alternative matching methods. 5. Concluding Remarks The primary aim of the investigation was to use the results of the bundle adjustments as a means to test the quality of the calibration procedures developed for the CCD cameras on the S9AP. The accuracy level achieved with the digital measurements was slightly lower than that for the manual measurements. With the test data used, it is difficult to separate out the exact source of this loss of accuracy: some certainly lies in the image matching techniques used, whilst small instabilities in the calibration may have contributed also. The conclusion for the calibration is that it is at an adequate level for the actual purpose for which it has been developed - DTM generation by image matching. The secondary aim was an investigation of aerial triangulation with point determination by image matching. The accuracy level is comparable with manual observations, but a more thorough investigation is required to determine the influence of poor matching on the result. Aspects of semi automation of the procedure have been addressed, where the use of natural tie-points would provide some additional advantages. If signalised points are used, their imaging quality must be high. 6. References ACKERMANN, F. and SCHNEIDER, W., 1986. High Precision Aerial Triangulation with Point Transfer by Digital Image Correlation. International Archives of Photogrammetry and Remote Sensing, 26(3/1): 18-27. BALTSAVIAS, E.P., 1988. Hierarchical Multiphoto Matching and DTM Generation. International Archives of Photo grammetry and Remote Sensing, 27(B 1 l/III): 476-487. BETHEL, J., 1986. The DSR11 Image Correlator. Proc. ASPRS Annual Convention (Washington DC), (4): 44-49. DAHLER, J., 1987. Problems in Digital Image Acquisition with CCD Cameras. Proc. ISPRS Inter-Commission Conference on Fast Processing of Photo gramme trie Data (Interlaken, DI Cf }j S c Switzerland), pp 48-59. 1 he GRÜN, A.W., and BALTSAVIAS, E.P., 1988. Geometrically Constrained Multiphoto Matching. Photogrammetrie Engineering and Remote Sensing, 54(5): 633-641. pic r 0 i: The GRÜN, A.W., and RUNGE, A., 1987. Projekt «Heinzenberg» - Präzisionsphotogrammetrie im Gebirge. Vermessung, Photogrammetrie, Kulturtechnik, 87(7): 271-276. GÜLCH, E., 1984. Geometrie Calibration of Two CCD Cameras used for Digital Image Correlation on the Planicomp C 100. International Archives of Photo grammetry and Remote Sensing, 25(A3a): 363-372. Helava, U., 1988. Digital Comparator Correlator System. International Archives of Photo grammetry and Remote Sensing, 26(B2): 160-170. PERTL, A., 1984. Digital Image Correlation with the Analytical Plotter Planicomp C 100. International Archives of Photo grammetry and Remote Sensing, 25(A3b): 874-882. SCHNEEBERGER, R., and BÜRGERMEISTER, W., 1987. The New Wild System-9 Analytical Stereoplotter Workstation S9AP. Proc. ASPRS Annual Convention (Baltimore), (2): 180-189. If

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