Systems for data processing, anaylsis and representation

Allam, Mosaad; Plunkett, Gordon

Bibliographic data

Monograph

Persistent identifier:: 1067490280

Title:: Systems for data processing, anaylsis and representation

Sub title:: ISPRS Commission II Symposium : June 6 - 10, Ottawa, Canada

Scope:: 1 Online-Ressource (XX, 530 Seiten)

Year of publication:: 1994

Place of publication:: Ottawa

Publisher of the original:: The Surveys, Mapping and Remote Sensing, Natural Resources Canada

Identifier (digital):: 1067490280

Illustration:: Illustrationen

Signature of the source:: ZS 312(30,2)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist aus dem Copyrightjahr ermittelt.

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

Editor:: Allam, Mosaad; Plunkett, Gordon

Corporations:: Symposium Systems for Data Processing, Analysis and Representation, 1994, Ottawa; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Instrumentation for Data Reduction and Analysis; Kanada, Surveys, Mapping and Remote Sensing Sector

Adapter:: Symposium Systems for Data Processing, Analysis and Representation, 1994, Ottawa; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Instrumentation for Data Reduction and Analysis; Kanada, Surveys, Mapping and Remote Sensing Sector

Founder of work:: Symposium Systems for Data Processing, Analysis and Representation, 1994, Ottawa; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Instrumentation for Data Reduction and Analysis; Kanada, Surveys, Mapping and Remote Sensing Sector

Other corporate:: Symposium Systems for Data Processing, Analysis and Representation, 1994, Ottawa; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Instrumentation for Data Reduction and Analysis; Kanada, Surveys, Mapping and Remote Sensing Sector

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Monograph

Collection:: Earth sciences

Chapter

Title:: [Tuesday, June 7, 1994]

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: [Session E-1 Intercommission WG II/III- Digital Photogrammetric Systems - Part A]

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: EVALUATION OF SOFTCOPY PHOTOGRAMMETRIC SYSTEMS: CONCEPTS, TESTING STRATEGY, AND PRELIMINARY RESULTS Raad A. Saleh and Frank L. Scarpace

Document type:: Monograph

Structure type:: Chapter

generated using different Ground Sampling Distance (GSD). Manual DTM GSD = 28 ft. Automatic DTM GSD = 25 ft. No. of DTM points Compared: 744 Average Error Calculated: -0.08 ft. Standard Deviation: 1.68 ft. Manual DTM GSD = 25 ft. Automatic DTM GSD = 12.5 ft. then interpolated to 25ft. No. of DTM points Compared: 744 Average Error Calculated: -0.035 ft. Standard Deviation: 1.28 ft. There are two conditions under which the above accuracies were obtained. First, ground controls were minimal in all above models, and second, images were scanned at a 22.5 micron resolution. With photo scale at 1"=300’, one pixel is 0.25 ft on ground. Scanning with 12.5 micron resolution would have yielded 0.15 ft on ground, a significant difference. 3.4 Speed An average of twenty percent of all models seems to be covered by elevated vegetation. Manual editing or manual extraction would be needed to obtain correct elevations of ground surface. This task is performed within the manual extraction/editing option available in most softcopy photogrammetric systems. The time needed for the additional manual extraction conforms to normal production standards of manual DTM extraction, assuming conventional photogrammetric systems. This is considered a loss in the speed and efficiency gained by the automated DTM extraction capability of the softcopy system. Durations were estimated for operator-system interaction required for standard stereophotogrammetric procedures. An overall estimate was recorded for the entire end-to-end process in the Intergraph system. A detailed step- by-step breakdown periods were recorded for Helava. On both cases, interaction durations were superior to what is expected in a conventional photogrammetric machine. 132 3.2 Expertise There is a shift in the kind of expertise required to operate a softcopy photogrammetric workstation. This expertise is a departure from what is normally required for conventional photogrammetric systems. Characteristics of this shift can be summarized as follows: - For operators, less knowledge required in photogrammetric engineering, as a result of the "black box" concept, while more required in computers, Unix, windows, file systems, disk storage, stereo display, etc. - For operators, basic system training is sufficient. - For team leaders, high level training is required, to ensure smooth flow of operation when operators encounter a difficult, out-of-usual, situation with system software/hardware. 4. CONCLUDING REMARKS -It has become obvious that softcopy photogrammetry technology does meet performance standards, even for large scale mapping, such as WisDOT photogrammetric operations. -Substantial gain in speed can be achieved with softcopy photogrammetric systems, assuming other bottle necks, such as data volume, are handled efficiently. -High end systems do provide at least comparable accuracy, when automated extraction methods work. However, substantial enhancements are needed to add some intelligence in the extraction process. Matching techniques tend to fail with simplest unexpected conditions. -Conversion of conventional production facilities into softcopy operations requires significant re- training of operators. Cost issues, data volume, technical SW/HW support need also to be carefully considered. ACKNOWLEDGMENT This paper deals with aspects of a research project funded by the Wisconsin Department of Transportation, under project number 0092-35-57. Évalua co Mots-C Le dom: profonc sont In nombre caracté des ut Systeme les me entrepr des re équipen conséqi directi mais importa d'évali Systéme traditi indique Systeme photogr entrepr photogr La sél: précis, restrei volonté object: prélimi systeme aux sy: certain examiné Opérate

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