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:: GPS CONTROLLED TRIANGULATION OF SINGLE FLIGHT LINES Ayman Habib, Kurt Novak

Document type:: Monograph

Structure type:: Chapter

) en joint vol, qui Le a un eurs type rois et fin; 2 la ère, la 1 et oyen GPS CONTROLLED TRIANGULATION OF SINGLE FLIGHT LINES Ayman Habib, Kurt Novak Department of Geodetic Science and Surveying The Ohio State University Columbus, Ohio, 43210-1247 Abstract Aerial triangulation controlled by GPS observations in the aircraft has been established as a precise method of photogrammetric point determination without the need of ground control. New developments of kinematic differential GPS processing yield accurate exposure locations instantaneously. If the GPS observations are available for blocks of aerial photos, the aerial triangulation can be carried out without any ground control points. Unfortunately, this method cannot be applied for single flight lines, since the GPS observations do not recover the roll angle of the aircraft. Therefore, ground control is mandatory for GPS controlled strip triangulation. This paper investigates GPS controlled strip triangulation using known, linear features on the ground that are approximately parallel to the flight line. Point to point correspondence between the linear feature on the ground and in the image is not necessary. This described technique models the linear feature in the images by low order polynomials and forces the known line on the ground onto this function. Thus, the roll angle can be determined. In this paper, we investigate the effects of different GPS measurement accuracies both in the air and on the ground on the results. Experiments using simulated and real data are presented. We also show that this new technique is useful for mapping railroads. Our tests verify the practical feasibility of GPS controlled strip triangulation with known linear objects on the ground. KEY WORDS: GPS controlled aerotriangulation, Strip triangulation. 1. Introduction The implementation of the NAVSTAR Global Positioning System (GPS) changed the way in which photogrammetric images are collected and aerial blocks are controlled. There are many different applications for GPS in photogrammetry (Ackermann, 1992-a), such as: Precise photo flight navigation, Pin-point photography, Positioning of the perspective center for aerial triangulation, and GPS positioning of ground control points. For the first and second applications real-time differential GPS based on C/A-code or P-code pseudo- range observations is required. Accuracies of 1 to 5 meters are sufficient in this case. The trajectory of the plane can be calculated continuously by observing at least four satellites in the aircraft. Pseudo range measurements are corrected by observations transmitted from a base station receiver. The computed position of the airplane can be displayed on a flight navigation System, The comparison of the airplane's actual position With the planned flight line yields corrections which are presented to the pilot or directly fed into the auto pilot System, These flight navigation systems permit the precise execution of a flight plan and the automatic exposure of aerial cameras. The other two applications rely on more precise positioning, but do not require real-time updates. This means that both pseudo ranges and phases must be observed, in order to compute the position of the GPS antennas to within a few centimeters. The last application (control point survey with GPS) pertains to geodesy, and will not be discussed here. The combination of GPS and photogrammetric measurements have been widely used for aerial triangulation to reduce or even eliminate ground control points. Lapine (1992) reports that aerial triangulation can be done without any ground control provided that the satellite signals are not blocked during the flight mission. However, there are a few problems that need attention in GPS aerotriangulation. Among these are the calibration of the GPS antenna offset, the camera time offset, the initial phase ambiguity, signal interruptions, and datum problems (Ackermann, 1992-b). The GPS observations made during the photo flight in the aircraft refer to the phase center of the GPS antenna. For aerial triangulation, however, the position of the camera's perspective center is needed. The offset between the GPS antenna and the perspective center has to be determined through a calibration procedure before 203

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