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:: [Wednesday, June 8, 1994]

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: [Session F-1 WG II/1 - Real-Time Mapping Technologies - Automatic Orientation of Sensors]

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: A PRECISE POSITIONING/ATTITUDE SYSTEM IN SUPPORT OF AIRBORNE REMOTE SENSING K. P. Schwarz, M. A. Chapman, M. E. Cannon, P. Gong, D. Cosandier

Document type:: Monograph

Structure type:: Chapter

A PRECISE POSITIONING/ATTITUDE SYSTEM IN SUPPORT OF AIRBORNE REMOTE SENSING K.P. Schwarz, M.A. Chapman, M.E. Cannon, P. Gong, D. Cosandier Department of Geomatics Engineering, The University of Calgary 2500 University Drive NW, Calgary, AB, Canada T2N 1N4 iphie Tel. (403) 220- 7377 Fax: (403) 284-1980 ISPRS, Commission II, WGII/1 - Session 2 KEY WORDS: Precise position and attitude system, geo-referencing, INS/GPS integration, pushbroom scanner, CCD frame imager, SAR, calibration of airborne sensors it en part ABSTRACT e VOI on ce Research in airborne remote sensing at The University of Calgary has as one of its goals the development of a precise positioning and attitude system that can be used with a variety of airborne sensors and will ultimately eliminate the need for ground control for georeferencing. In this paper, accuracy requirements for such a system are discussed, different sensor : configurations are described, and results of the U of C prototype development are analyzed. Applications can be subdivided ative into three major groups: those where precise positioning is the major requirement, such as photogrammetric applications; ne de those where both position and attitude are required with high accuracy, such as pushbroom imaging applications; and those niner where accurate velocity estimation for motion compensation is also needed, as in radargrammetric applications. Sensor ition configurations for different applications will be discussed and first results of airborne tests will be briefly reviewed. GPS nnant 1. INTRODUCTION The current system covers a large range of possible e de applications and will have specific advantages in ne de Airborne remote sensing considerably extends the applications of digital remote sensors, such as pushbroom r en capabilities of satellite remote sensing in terms of scanners and CCD frame images. resolution and operational planning. Where satellite remote nent. ; : : : dis sensing at best achieves accuracies of 10 -15 m, airborne LS1on remote sensing has the potential of achieving accuracies at 2. ACCURACY REQUIREMENTS FOR n de the decimeter level in position. Whereas the usefulness of DIFFERENT APPLICATION AREAS -ypes satellite remote sensing is often restricted by the images ilyse available for a certain area and the extent of the intervening ^ Airborne remote sensing in its classical form of airborne juipé cloud coverage, there are no such limitations in airborne photogrammetry has been widely used for cartographic remote sensing. It is, therefore, possible to optimize the mapping at all scales and currently is the only system used required result by adapting the operational conditions to the for high accuracy applications. Its major drawback is that task at hand. the data collection process is film-based and not digital. : More recently, other airborne remote sensing devices, such The inherent accuracy and flexibility of airborne remote as pushbroom scanners, have been extensively used in those sensing is currently not used because the standard method of agricultural and forestry applications where accuracy georeferencing airborne images by available ground control requirements are not that stringent. With the ongoing limits not only the accuracy, but also often puts operational ^ improvement of scanning systems and linear array systems, constraints on a specific flight mission. The objective of a fully digital system with onboard exterior orientation, the research currently conducted at The University of Calgary suitable for a wide range of applications, seems to be within is o remove these constraints and to replace the indirect reach. To define the design parameters of such a system, user method of georeferencing by ground control by a direct requirements will first be discussed. method of georeferencing from the aircraft. In other words, the exterior orientation of each image will be determined in real-time by onboard sensors and not in post mission by interpolation between available ground control. The fact that the method is in principle independent of available ground control has obvious economic advantages, especially in areas with poor or sparse control. The fact that position and attitude are available in real time is of no immediate advantage in current applications but may be of importance in the future. In high precision photogrammetric applications such as highway planning, large engineering projects, and cadastral applications, positional accuracies of 10 cm or less are required. In such applications, non-standard photographic overlaps of 80 % longitudinal and 60 % lateral are often employed to increase the image per object point ratio. Typical accuracy requirements at photo scales of 1:3 000 to 1:6 000 are 5-10 cm in position and 15-30 arcseconds in attitude. External attitude is not needed when a photogrammetric block adjustment approach is applied. In those cases, the geometric strength of interlocking bundles can be used to eliminate the attitude requirement. In this paper, requirements for an airborne system of this type are presented in four points. First, the accuracies required in different application areas are discussed. Second, the performance of currently available remote sensing devices are reviewed. Third, the georeferencing problem is briefly presented, i.e. the transformation of the airborne measurements to ground level. Fourth, the implementation of the georeferencing problem by currently available position and attitude sensors is analysed. Finally, some possible sensor configurations are studied and first results of à prototype system, developed at the U of C, are presented. Map accuracy is a function of map scale, thickness of printed lines, and positional accuracy of lines and points on the map sheet. The thinnest line that 1s legible on maps is about 0.05 mm. This high accuracy is impossible to achieve in the map compilation process which adds to the error budget through generalization, project transformation, information transfer, fine drawing, printing, etc. Typical values for the 191

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