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

iy data ystems nity is laims. cilities it, and ly will vident ntional s, and ftcopy t of a ystems testing ategy, und to pecific lation. sportation options softcopy mapping siven that hand is onform to taining to sues need ion. For ave been N and the Helava SOCET SET. Other systems are being considered for testing as well. This paper summarizes preliminary results of investigating the utility of using softcopy photogrammetric systems in place of selected WisDOT mapping operations. The evaluation concept, strategy, and results can be generalized for other agencies of similar production requirements. 2. CONCEPT AND STRATEGY The evaluation project is designed to address: a) Functions and Operational Characteristics: These include software, such as input/output, orientation procedures, and extraction; hardware, such as mono and stereo viewing, floating mark operations and coordinate measurements, memory, and storage capacity; and other system related operational requirements, such as user interface. b) Accuracy: To determine if automated DTM extraction techniques do actually attain acceptable accuracies, the following tests have been devised for this purpose. - Comparing DTM generated by softcopy system automated correlation methods, against DTM generated manually by a WisDOT operator using conventional plotters. - Comparing DTM generated by softcopy system automated correlation methods, against DTM generated manually by a WisDOT operator using same softcopy system. The WisDOT mapping accuracy standards require that error must not exceed 0.3 inch for 100% of direct observations, and same for at least 90% of indirect observations. C) Speed: A substantial gain in time can be achieved if the accuracy attained by automated extraction methods are higher or at least comparable to that normally attained by an experienced photogrammetric operator. Another criterion is defined by operator-system interaction time required for a full end-to-end stereophotogrammetric process. Interaction time is observed in the softcopy systems and compared with existing WisDOT standards for a typical mapping operation. 131 3. EVALUATION RESULTS 3.1 Data Management The images used in this project were scanned in 22.5, 15, and 12.5 microns. The file sizes ranged 340+, 235+, and 100+ megabytes. This range of data volumes requires significant storage capabilities. There are some options to deal with such extensive amount of data for production environment. These include options such as central data bank, local area network, etc. 3.2 Eye Fatigue The Intergraph and Helava systems utilize two different technologies for stereo viewing. In both cases, however, the WisDOT operators commissioned to examine the systems on site, Le., UW Softcopy Photogrammetry Lab, expressed eye fatigue shortly after they used the systems. These operators were trained on, and routinely used, stereoscopic vision with optical components with continuous-tone hardcopy media. Optics of most conventional photogrammetric machines tend to be of high quality and craftsmanship, and hence very expensive. This is to ensure best visual quality, geometric accuracy, and above all, to enable the operator's eyes hours of focusing with minimal exhaustion. This can be generalized with operators of any conventional photogrammetric production facility. It is anticipated, however, that eye fatigue would be reduced as operators get used to the systems. 3.3 Accuracy Comparing DTM generated manually by a DOT operator, using conventional plotter, against an automatically extracted DTM. Model 1: No. of DTM points Compared: 3046 Average Error Calculated: 0.7067 ft. Standard Deviation: 1.063 Model 2: Comparing DTM generated manually by a DOT operator, using Helava system, against two automatically extracted Comparing. Each was

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