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:: [Joint ISPRS/ GIS '94 Plenary III]

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: THE USE OF GPS FOR GIS GEOREFERENCING: STATUS AND APPLICATIONS M. Elizabeth Cannon

Document type:: Monograph

Structure type:: Chapter

A new initiative at The University of Calgary is the VISAT program which combines a GPS receiver, a strapdown INS, and a cluster of CCD cameras mounted in a van. Requirements for the system are to provide precise positions at the 0.3 m level (RMS) of the cluster of CCD cameras. The digital imagery is then used to acquire positions of objects in the road corridor within a 50 m radius. These points are required with a 0.1 m relative accuracy. Tests have been conducted to confirm that the system can deliver these levels of accuracy, and further details are given in Schwarz et al. (1993). Another system which has been developed at Ohio State University is described in Bossler and Novak (1993). 5. MARINE APPLICATIONS 5.1 Water Level Profiling Precise knowledge of water levels is essential for tidal studies and other hydrographic purposes such as the establishment of chart datums. GPS offers the possibility of determining water level profiles with a cm-level accuracy using carrier phase measurements on-the-fly. Accurate Bench Marks (B.M.'s) can also be established along the shores if an accurate geoid model is available. This is an important development since levelling operations may be prohibitive in remote areas such as the McKenzie River in Northern Canada. A feasibility study was conducted by The University of Calgary in conjunction with the Canadian Hydrographic Service (CHS) to obtain water level profiles and establish B.M.'s along an 80 km segment of the Fraser River, British Columbia. A first order levelling line along the river was used to assess the accuracy of the GPS-derived orthometric heights. Results from the test are given in Lachapelle et al. (1993) and show that an accuracy of about 5.5 cm (RMS) could be achieved between the GPS-derived orthometric heights and the levelled B.M. height. Part of the error budget is due to the height transfer method (accurate to about 2 cm) as well as the geoid. Overall, the feasibility study was successful and the GPS-derived water level profiles are being analysed to determine the extent of tidal and other effects. 5.2 Attitude Determination The use of attitude determination systems in the marine environment is important for the correction of hydrographic data from multi-beam acoustic 170 surveying, for example. Traditionally, INS have been used since no other system has shown the capability of providing the level of required accuracy. However, INS drift over time so a cost- effective alternative is a GPS attitude determination system. These systems can either be self-contained units which is one receiver with several channels dedicated to each antenna (usually up to four), or may be comprised of several independent receiver systems. The latter case was tested in June, 1993 in a joint effort between The University of Calgary and CHS. Four NovAtel GPSCard™ receivers were mounted on a hydrographic survey vessel with separations of 12 to 42 metres. Data was collected at a 10 Hz rate and post-processed to derive the ship's roll, pitch and azimuth. In the test, the ship's roll reached up to 10 degrees and when the GPS results were compared to the roll derived from an onboard INS, the RMS agreement was at the level of 2.7 arcminutes, with an agreement of 1.1 arcminutes during straight portions of the trajectory. Sample roll results are given in Figure 7. These results clearly show the feasibility of using multi-antenna GPS for accurate attitude determination. It is expected that these systems will be further utilized in the marine environment with the continual decrease in GPS receiver costs. See Lachapelle et al. (1994) for more information on the above test. 0.4 Mean = 0.0036 deg RMS - 0.045 deg c N 1 -0.24 Roll Differences (deg) e 1 0.4 UTC (seconds of the day) Fig.7: GPS-INS Roll Differences - June 93 Test 6. AIRBORNE APPLICATIONS Many of the current airborne GPS applications centre around the photogrammetric and remote sensing areas as well as for precision landing of civilian aircraft. The latter application will not be discussed in this paper, but can be found in existing literature. 43000 44000 45000 46000 47000 4800 The Unive the develo precise determina eliminatic applicatior system are use as we the require for large-: relaxed to applicatio sufficientl where the arcsecond: GPS/INS found in S« Several fl confirm th for precis difficulties during suc required. photogram determine which ther coordinate build redu ground G trajectorie: described when four and two o over 100 kr 10-20 cm le measureme = Fig.8: Many ott environme positioning This work University in their m 1994). The tests have

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