Asia-Pacific Gravity and Geoid Meeting 2027
Static and Time-Varying Gravity for Vertical Datums, Groundwater, and Land Subsidence
January 5–7, 2027 | National Yang Ming Chiao Tung University, Hsinchu, Taiwan
Scientific Program
Preliminary Program
The detailed scientific program will be announced in late October 2026.
5 January 2027 — In-person Asia-Pacific Workshop
The first day will be an invitation-focused, highly interactive meeting for overseas participants, Taiwan researchers, students, and representatives of relevant agencies. The emphasis will be on building working relationships and identifying specific opportunities for regional cooperation rather than on a large number of formal presentations.
| Time | Activity |
|---|---|
| 09:00–09:20 | Opening, welcome, and workshop objectives |
| 09:20–10:30 | Taiwan gravity, geoid, and physical height-system programs |
| 10:50–12:20 | Short country reports from Southeast and South Asian participants |
| 13:30–14:50 | Terrestrial gravimetry for groundwater, hydrology, and land subsidence |
| 15:10–16:10 | Regional geoid, vertical datum, and GNSS height-conversion challenges |
| 16:10–17:10 | Round-table: Asia-Pacific cooperation, training, data sharing, and joint projects |
| 17:10–17:40 | Laboratory/instrument visit and preparation for the field excursion |
| Evening | Informal workshop dinner for invited participants |
6 January 2027 — International Hybrid Scientific Meeting
The second day will be the main scientific event and will be open to a wider audience. On-site and online presentations will be integrated within the same sessions.
To facilitate participation across time zones, North American online speakers will be scheduled primarily in the Taiwan morning, while European online speakers will be scheduled primarily in the Taiwan afternoon (Taiwan time = UTC+8 h).
| Time | Activity |
|---|---|
| 09:00–16:30 | Hybrid presentations of invited papers from the Aisa-Pacific region |
Presentations will normally consist of 15 minutes for presentation plus 5 minutes for discussion.
Online speakers will be asked to provide a prerecorded backup presentation in advance for technical contingency.
7 January 2027 — Yunlin County Scientific Field Excursion
The third day will demonstrate how geodetic observations are used in an area strongly affected by groundwater extraction and land subsidence.
- Visit gravity observation sites used to monitor temporal mass/storage changes.
- Discuss the relationship among groundwater withdrawal/recharge, gravity change, and land subsidence.
- Visit selected land-subsidence monitoring infrastructure, such as leveling, GNSS, or related monitoring sites, subject to access arrangements.
- Explain why GNSS ellipsoidal heights require a precise, vertical-datum-consistent geoid model for reliable conversion to orthometric heights.
- Discuss how gravity, geoid, GNSS, leveling, and hydrological observations can be integrated for operational groundwater management.
- Lunch and dinner are included.