Volker Janssen

Currently Lecturer, Centre for Spatial Information Science,
Dept. of Geography & Environmental Studies,
University of Tasmania, Australia
(Since 1998 graduate student, awarded PhD 18.7.2003)

Biography:

I've finished my Ph.D. and the graduation ceremony was held on 14 October 2003. Thesis details: Janssen, V. (2003): A Mixed-Mode GPS Network Processing Approach for Volcano Deformation Monitoring, PhD Dissertation, UNISURV S-74, School of Surveying and Spatial Information Systems, The University of New South Wales, Sydney, Australia, ISBN 0-7334-2059-1, viii + 199pp.

During 2003 I was employed as an Associate Lecturer in the School of Surveying & Spatial Information Systems, the University of New South Wales, Sydney, Australia. My appointment ended mid-February 2004. Since 23 August 2004, I have an appointment as a Lecturer at the Centre for Spatial Information Science, Dept. of Geography & Environmental Studies, University of Tasmania

In late November 2002 I travelled to Brunei with A/Prof. Peter Morgan from the University of Canberra to carry out a 10-day GPS survey for geodetic control. Some of the sites were located in the middle of the jungle, making it a fantastic experience to work under such extreme conditions. Thanks heaps to all the people at NSC - it's been great working with you! On the way back to Australia I stopped over in Indonesia for a week to check out our GPS stations on Gunung Papandayan after the recent 11-20 November eruption. The topography of the volcano has changed quite a lot. Read more about the volcanic eruption and check out some photos...

From late June to early August 2001 I went to Indonesia with Craig Roberts again. We were able to demonstrate continuous operation of our 4-station low-cost single-frequency GPS network surrounded by a 3-station fiducial network of Leica CRS1000s around Gunung Papandayan in West Java. It was great to work with our friends and collaborators from the ITB and the VSI again. Here is our report...

From mid November 2000 to mid March 2001 I went to Antarctica with Michael Moore to carry out GPS observations amongst icebergs and penguins. We were based at Davis station and also spent four weeks camping on the Amery Ice Shelf. A magnificent experience! Check out the Australian Antarctic Devision's website for more information and have a look at some photos.

From mid October to mid November 2000 I travelled through Europe following AC/DC on their Stiff Upper Lip tour. They still rock! Check out my AC/DC page for more details...

From 18-22 July 2000 I attended the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI) General Assembly in Bali, Indonesia, and gave a presentation. The theme of the congress was "Exploring Volcanoes: Utilization of their Recources and Mitigation of their Hazards".

On 30 April 2000 I competed in my first marathon, the Host City Marathon held on the Olympic course in Sydney, finishing in 3:27:35 hours.

In February/March 2000 I went to Indonesia with Craig Roberts for four weeks. I set up and observed a 3-station fiducial network around Gunung Papandayan in West Java. The fiducial sites were equipped with Leica CRS1000 dual-frequency receivers and surrounded the deformation zone of the volcano. This configuration was used to obtain empirical corrections to be applied to the inner single-frequency network situated on the volcano to improve accuracy. It was great to meet our friends and collaborators at the Institute of Technology Bandung (ITB) and the Volcanological Survey of Indonesia (VSI). Thanks for your help, guys. Here is our report...

Education:

Dipl.-Ing. (Geodesy), University of Bonn, Germany, 1997.

Ph.D., The University of New South Wales, Sydney, Australia, 2003.

Professional Memberships:

German Association of Surveying (Deutscher Verein fur Vermessungswesen, DVW)

Institution of Surveyors Australia (ISA)

Australian Global Positioning System Society

Awards:

2003: Selected as U.S. Institute of Navigation's student scholarship winner to attend the 16th International Technical Meeting of the Satellite Division of the U.S. Institute of Navigation, Portland, Oregon, 9-12 September 2003.

2003: Best Student Paper Award at the 6th International Conference on Satellite Navigation Technology Including Mobile Positioning & Location Services (SatNav), Melbourne, Australia, 22-25 July 2003.

2000: Awarded the 'Best Tutor Prize 1999' by the School of Geomatic Engineering (now School of Surveying and Spatial Information Systems).

1998-2002: Faculty of Engineering scholarship for IPRS scholars.

1998-2002: International Postgraduate Reasearch Scholarship (IPRS) to undertake Ph.D. studies at UNSW.

Interests:

AC/DC, Running, Travelling, Skiing

Short Biography:

Volker Janssen graduated with a Dipl.-Ing. (Surveying) from the University of Bonn, Germany, in 1997 and joined the SNAP group at the School of Surveying & Spatial Information Systems (formerly the School of Geomatic Engineering), The University of New South Wales as a Ph.D. student in 1998. His research is focused on GPS (volcano) deformation monitoring and the integration of GPS with InSAR for such purposes. He also participated in several GPS field campaigns in Indonesia, Brunei, and Antarctica. During his Ph.D. studies Volker was supported by an International Postgraduate Research Scholarship (IPRS). He received his Ph.D. in 2003. 

PhD Research Projects:

GPS-based volcano deformation monitoring

Integration of GPS and InSAR for ground deformation monitoring

Publications:

Janssen, V. (2001): Optimizing the Number of Double-Differenced Observations for GPS Networks in Support of Deformation Monitoring Applications, GPS Solutions, 4(3), 41-46. (Download PDF)

Janssen, V., C. Roberts, C. Rizos and H.Z. Abidin (2001): Experiences with a Mixed-Mode GPS-Based Volcano Monitoring System at Mt. Papandayan, Indonesia, Geomatics Research Australasia, 74, 43-58. (Download PDF)

Janssen, V., C. Roberts, C. Rizos and H.Z. Abidin (2002): Low-Cost GPS-Based Volcano Deformation Monitoring at Mt. Papandayan, Indonesia, Journal of Volcanology and Geothermal Research, 115(1-2), 139-151. (Download PDF)

Janssen, V. (2002): GPS on the Web: GPS Volcano Deformation Monitoring, GPS Solutions, 6(1-2), 128-130. (Download PDF)

Janssen, V. and C. Rizos (2002): Mixed-Mode GPS Network Processing for Deformation Monitoring Applications in the Equatorial Region, Journal of Geospatial Engineering, 4(2), 81-94. (Download PDF)

Janssen, V. and C. Rizos (2003a): A Mixed-Mode GPS Network Processing Approach for Deformation Monitoring Applications, Survey Review, 37(287), 2-19. (Download PDF)

Janssen, V. and C. Rizos (2003b): Processing Mixed-Mode GPS Networks for Deformation Monitoring Applications, zfv - Zeitschrift fur Geodaesie, Geoinformation und Landmanagement (Journal of Geodesy, Geoinformation and Land Management), 128(2), 87-96. (Download PDF)

Janssen, V. and C. Rizos (2003c): Mixed-Mode GPS Deformation Monitoring - A Cost-Effecrtive and Accurate Alternative?, to appear in Proc. IUGG2003, Sapporo, Japan, 30 June - 11 July. (Download PDF)

Ge, L., V. Janssen, Y. Wang and C. Rizos (2003): A Double-Differencing Algorithm for GPS-Derived Topographic Delay Corrections to Differential Radar Interferometry, submitted to Journal of Geodesy. (Download PDF)

Janssen, V., L. Ge and C. Rizos (2003): Tropospheric Delay Corrections to Differencial InSAR Results from GPS Observations, to appear in Proc. 6th Int. Symp. on Satellite Navigation Technology Including Mobile Positioning & Location Services (SatNav), Melbourne, Australia, 22-25 July, paper 42. (Download PDF)

Janssen, V., L. Ge and C. Rizos (2003): Differential SAR Interferometry: Tropospheric Corrections from GPS Observations, submitted to International Journal of Remote Sensing. (Download PDF)

Janssen, V. (2003a): GPS-Derived Tropospheric Delay Corrections to Differential InSAR Results, Proc. ION GPS-2003, Portland, Oregon, 9-12 September, 2692-2704. (Download PDF)

Janssen, V. (2003b): A Mixed-Mode GPS Network Processing Approach for Volcano Deformation Monitoring, PhD Dissertation, UNISURV S-74, School of Surveying and Spatial Information Systems, The University of New South Wales, Sydney, Australia, ISBN 0-7334-2059-1, viii + 199pp.

Presentations:

Janssen, V. (1998): Does the Choke Ring Antenna Significantly Reduce the Effect of Multipath on GPS Observations?, Pres. at the 26th Annual Research Seminars, School of Geomatic Engineering, The University of New South Wales, Sydney, Australia, 16-17 November.

Janssen, V. (1999): GPS at Tide Gauges: Is Multipath Due to Water Surfaces a Concern?, Pres. at IUGG99, Birmingham, UK, 18-30 July.

Janssen, V. (1999): Optimising the Number of Double Difference Observations for GPS Networks in Support of Deformation Monitoring Applications, Pres. at the 27th Annual Research Seminars, School of Geomatic Engineering, The University of New South Wales, Sydney, Australia, 8-9 November.

Janssen, V. (2000): Low-Cost Continuous GPS Volcano Deformation Monitoring on Gunung Papandayan: The Second Generation, Pres. at the Volcanological Survey of Indonesia (VSI), Bandung, West Java, Indonesia, 13 March.

Janssen, V., C. Roberts, C. Rizos and H.Z. Abidin (2000): Experiences with a Mixed-Mode GPS-Based Volcano Monitoring System at Mt. Papandayan, Indonesia, Pres. at the Western Pacific Geophysics Meeting (WPGM), Tokyo, Japan, 27-30 June.

Janssen, V., C. Roberts, C. Rizos, H.Z. Abidin and O.K. Suganda (2000): A Mixed-Mode GPS-Based Volcano Monitoring System: First Tests at Gunung Papandayan, Indonesia, Pres. at the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI) General Assembly, Bali, Indonesia, 18-22 July.

Janssen, V. (2000): Uberwachung aktiver Vulkane mit GPS: Erfahrungen am Papandayan Vulkan in Indonesien, Pres. at the Geodetic Institute, University of Bonn, Germany, 17 October.

Janssen, V. (2001): Continuous GPS Deformation Monitoring on Gunung Papandayan: A Status Report, Pres. at the Volcanological Survey of Indonesia (VSI), Bandung, West Java, Indonesia, 3 August.

Janssen, V. (2001): Using Ionospheric Corrections to Optimise Low-Cost GPS Volcano Deformation Monitoring, Pres. at the 29th Annual Research Seminars, School of Surveying and Spatial Information Systems, The University of New South Wales, Sydney, Australia, 5-6 November.

Janssen, V. and C. Rizos (2002): Processing a Mixed-Mode GPS Network for Deformation Monitoring Applications, Pres. at the Western Pacific Geophysics Meeting (WPGM), Wellington, New Zealand, 9-12 July.

Janssen, V. (2002): Mixed-Mode GPS Network Processing in Support of Deformation Monitoring Applications, Pres. at the 30th Annual Research Seminars, School of Surveying and Spatial Information Systems, The University of New South Wales, Sydney, Australia, 11-12 November.

Janssen, V. and C. Rizos (2003): Mixed-Mode GPS Deformation Monitoring - A Cost-Effecrtive and Accurate Alternative?, Pres. at IUGG2003, Sapporo, Japan, 30 June - 11 July.

Janssen, V., L. Ge and C. Rizos (2003): Tropospheric Delay Corrections to Differencial InSAR Results from GPS Observations, Pres. at 6th Int. Symp. on Satellite Navigation Technology Including Mobile Positioning & Location Services (SatNav), Melbourne, Australia, 22-25 July.

Janssen, V. (2003): GPS-Derived Tropospheric Delay Corrections to Differential InSAR Results, Pres. at ION GPS-2003, Portland, Oregon, 9-12 September.