Conference and Seminar Proceedings
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Technical Seminar on Vertical References Frame in Practice
27-28 July 2015 in Singapore
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Proceedings
Monday 27th July 2015
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08:30 – 09:00 |
Welcome and Opening Remarks -
- Mr. Nic Donnelly, New Zealand
- Prof. Chris Rizos, Australia
- Mr. Victor Khoo, Singapore
- Ms Sharafat Gadimova, Austria
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09:00 – 10:30 |
Session 1: Introduction and Definitions
Prof. Chris Rizos, Australia
[Presentation]
Need for, benefits and applications of a height system, Height
systems: Geometric height systems, Physical height systems, Physical
reference surfaces (geoid, quasi-geoid), Geopotential numbers,
Physical heights (dynamic, orthometric, normal, MSL), Measuring
potential differences (levelling+gravity), Datum definition
concepts. |
10:30 – 11:00 |
Morning Tea |
11:00 – 12:30 |
Session 2: Time Dependence and Transformations Prof. Chris Rizos, Australia
[Presentation] Time-dependent heights: Earth tides, Glacial Isostatic Adjustment
(GIA), Subsidence, Episodic vertical displacements (e.g.
earthquakes, volcanos, landslides); Transformations. |
12:30 – 13:30 |
Lunch |
13:30 – 15:30 |
Session 3: Case Studies I
Mr Basara Miyahara, Japan
Case study of Japan
[Presentation]
Current vertical datum of Japan, Maintenance of datum utilizing COR
(monitoring of displacements by CORS, revision of heights in case of
earthquakes), Orthometric height determination with a hybrid geoid
model.
Mr. Simon CW Kwok, Hong Kong
Modernization of Height System in Hong Kong
[Presentation]
Hong Kong vertical reference system, Hong Kong Principal Datum
(HKPD), Modernizing the vertical height system by (1) a
comprehensive re-levelling of the bench mark network, (2)
re-adjustment of the levelling measurement with reference to the
HKPD, (3) densify a network of points covering the whole territory
of Hong Kong with levelling, GNSS and gravity observations, and (4)
creation of a Geoid Model for GNSS heighting in Hong Kong.
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15:30 – 16:00 |
Afternoon Tea
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16:00 – 17:30 |
Session 4: Airborne Gravity for an improved
vertical datum and ICG
Mr Nic Donnelly, New Zealand
Airborne Gravity for an improved vertical datum
[Presentation]
Contribution of airborne gravity to the geoid/quasigeoid, planning
an airborne gravity survey, flying airborne gravity, data
processing, calibration lines, assessment of results, using New
Zealand as an example
Ms Sharafat Gadimova, Austria
Presentation of International Committee on
GNSS (ICG) at UN
[Presentation]
The presentation will highlight the latest developments in the ICG
and the future role of ICG in a multi-constellation GNSS. The
outline of the ICG's Programme on GNSS applications, focusing on
capacity-building in the use of GNSS-related technologies in various
rapidly growing fields of science and industry will be provided.
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19:00 – 22:00 |
Seminar Dinner
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Tuesday 28th July 2015
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14:00 – 15:30 |
Session 5: GNSS Heighting and Episodic Vertical
Displacements
Mr. Richard Loo and Mr. Victor Khoo,
Singapore
GNSS Heighting and Application
to Singapore
[Presentation]
The presentation will introduce the height datum used in Singapore,
describe the computation of geoid model, usage of GNSS in heighting
and the importance of the height datum.
Mr Nic Donnelly, New Zealand
Incorporation of episodic vertical displacements
into vertical reference frames
[Presentation]
Types of vertical displacement, impact on vertical reference frames,
data collection, managing the relationship between geometric and
vertical reference frames, user requirements for vertical
deformation modelling, incorporating a deformation model into a
vertical reference frame
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15:30 – 16:00 |
Afternoon Tea
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16:00 – 17:30 |
Case Studies II
Mr Graeme Blick, New Zealand
Case Study New Zealand
[Presentation]
New Zealand’s levelling datums, New Zealand Quasigeoid 2009, New
Zealand Vertical Datum 2009, relationships between levelling and
quasigeiod-based reference frame, the role of the vertical reference
frame in earthquake recovery, user requirements for the vertical
reference frame, proposed new vertical reference frame for New
Zealand
Dr. John Dawson, Australia
Case Study Australia
[Presentation]
The Australian Height Datum (AHD). Maintenance of AHD using GNSS, a
new national geodetic adjustment and refinement of AUSGeoid -
Australia’s combined gravimetric–geometric quasi-geoid model. The
use of Interferometric Synthetic Aperture Radar (InSAR) to develop a
national deformation model to support height system maintenance.
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17:30 |
Closing Remarks – FIG Commission 5, IAG
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