Clement Ogaja

Former graduate student (awarded PhD 21.8.2002)

Research Scientist
National Mapping Division
Geoscience Australia
Canberra ACT
Email: Clement.Ogaja@ga.gov.au

B.Sc. (Hons) in Surveying, University of Nairobi, Kenya, 1997.

Ph.D., The University of New South Wales, Sydney, Australia, 2002.

2002: Awarded his Ph.D. on 21st August 2002. OGAJA, C., 2002. A Framework in Support of Structural Monitoring by Real Time Kinematic GPS and Multisensor Data. PhD thesis, School of Surveying & Spatial Information Systems, University of New South Wales, Sydney, Australia, UNISURV S-71, 191pp.

2002: Winner of best student paper award, 2nd Symp. on Geodesy for Geotechnical & Structural Applications, Berlin, Germany, 21-24 May.

2001: Selected as best paper award winner for the paper presented in the session of "Carrier Phase-Based Positioning I" at the 14th Int. Tech. Meeting of the Satellite Division of the US Institute of Navigation, Salt Lake City, Utah, 11-14 September.

2001: Selected as U.S. Institute of Navigation's student scholarship winner to attend the 14th International Technical Meeting of the Satellite Division of the US Institute of Navigation, Salt Lake City, Utah, 11-14 September.

1999: Won a prize by the Institution of Surveyors of Kenya for being the best final year student, Department of Surveying, University of Nairobi.

1997: A Certificate of Merit for being the best final year student, Department of Surveying, University of Nairobi.

Programming, physical fitness, bible study, travelling and video.

PhD Research:

Continuous GPS-based Building and Structural Monitoring. Many monitoring problems can be stated as the problem of detecting a change in the parameters of a static or dynamic stochastic system. The main goal of this project was to develop a special framework for solving the 'change detection problem' using measurements derived from GPS sensor(s), both on-line and off-line. Specific to the project was the study of abrupt and wind/earthquake-induced responses of civil structures such as high-rise buildings, towers, bridges, dams and the like. Studies were carried out on Singapore's Republic Plaza Building.

 

Publications:

OGAJA, C., 2002. A Framework in Support of Structural Monitoring by Real Time Kinematic GPS and Multisensor Data. PhD thesis, School of Surveying & Spatial Information Systems, University of New South Wales, Sydney, Australia, UNISURV S-71, 191pp.

OGAJA, C., 2002. Software implementation of multi-sensor data reduction and integrity assessment of GPS data for structural monitoring applications. In Proc. 2nd Symp. on Geodesy for Geotechnical & Structural Engineering, 21-24 May, Berlin, Germany, 27-37.

OGAJA, C., 2001. On-line GPS integrity monitoring and deformation analysis for structural monitoring applications. 14th Int. Tech. Meeting of the Satellite Division of the U.S. Inst. of Navigation, Salt Lake City, Utah, 11-14 September, 989-999. (Download PDF)

OGAJA, C., RIZOS, C. & HAN, S., 2000. Is GPS good enough for monitoring the dynamics of high rise buildings? 2nd Trans Tasman Survey Congress, Queenstown, New Zealand, 20-26 August, 150-164. (Download PDF)

OGAJA, C., RIZOS, C., WANG, J., & BROWNJOHN, J., 2002. GPS and building monitoring case study: Republic Plaza Building, Singapore. Submitted to the Australian Surveyor. (Download PDF)

OGAJA, C., RIZOS, C., WANG, J., & BROWNJOHN, J., 2001. Towards the implementation of on-line structural monitoring using RTK-GPS and analysis of results using the wavelet transform. 10th FIG Int. Symp. on Deformation Measurements, Orange, California, 19-22 March, 284-293. (Download PDF)

OGAJA, C., RIZOS, C., WANG, J., & BROWNJOHN, J., 2001. A dynamic GPS system for on-line structural monitoring. Int. Symp. on Kinematic Systems in Geodesy, Geomatics & Navigation (KIS2001), Banff, Canada, 5-8 June, 290-297. (Download PDF)

OGAJA, C., RIZOS, C., WANG, J., & BROWNJOHN, J., 2001. High precision dynamic GPS system for on-line structural monitoring. 5th Int. Symp. on Satellite Navigation Technology & Applications, Canberra, Australia, 24-27 July, paper 35, CD-ROM proceedings. (Download PDF)

OGAJA, C., WANG, J., & RIZOS, C., 2001. Principal Component Analysis of wavelet transformed GPS data for deformation monitoring. In Vistas for Geodesy in the New Millennium, J. Adams & K.P. Schwarz (eds.), IAG Symp. Vol.125, Spinger-Verlag, ISBN 3-540-43454-2, 341-346. (Download PDF)

OGAJA, C., WANG, J., & RIZOS, C., 2001. Principal Component Analysis of wavelet transformed GPS data for deformation monitoring. IAG Scientific Meeting, Budapest, Hungary, 3-8 September, CD-ROM proc. Symp. C3 "New Concepts in Engineering Geodesy", poster 2.

OGAJA, C., WANG, J., RIZOS, C., & BROWNJOHN, J., 2002. Multivariate monitoring of GPS observations and auxiliary multi-sensor data. GPS Solutions, 5(4), 58-69. (Download PDF)

OGAJA, C., WANG, J., & RIZOS, C., 2002. Detection of wind-induced response by wavelet transformed GPS solutions. Submitted to the Journal of Surveying Engineering.

SATIRAPOD, C., OGAJA, C., WANG, J. & RIZOS, C., 2001. GPS analysis with the aid of wavelets. 5th Int. Symp. on Satellite Navigation Technology & Applications, Canberra, Australia, 24-27 July, paper 39, CD-ROM proceedings.

SATIRAPOD, C., OGAJA, C., WANG, J. & RIZOS, C., 2001. An approach to GPS Analysis incorporating wavelet decomposition. Artificial Satellites, 36(2), 27-35.