International GNSS Service

GPS Tide Gauge Benchmark Monitoring - Working Group

The IGS plays a significant role in promoting, establishing and the densification of a global reference system. Moreover, coordinates published and distributed by the IGS are used in numerous scientific applications, ranging from plate tectonic studies to atmospheric sounding. In contrast, since the beginning of the GPS era several studies have revealed the uncertainty in the GPS height component. Especially when studying sea level changes, where the GPS height of the benchmark is used for defining an absolute sea level datum, problems occur when correcting the time series for height changes of the benchmark.

Addressing the height component in routine computation and establishing and maintaining new geodetic ties to tide gauge systems will be further an important contribution to climate change studies. With the TIGA Working Group as described in the Call for Participation the IGS will again provide its expertise to a new field of scientific application.

In December 2010 the IGS Governing Board accepted the change of the TIGA Pilot Project to the TIGA Working Group. A Call for Participation was issued on January 16th, 2011.

Updated GLOSS Implementation Plan

17 Oct 2012

The Global Sea Level Observing System (GLOSS) recently updated its implementation plan.

"The focus of the GLOSS Implementation Plan 2012 remains the maintenance and expansion of the GLOSS Core Network [GCN] and to acquire highly accurate and long-term datasets from GCN. The 2012 plan calls for two significant upgrades motivated by scientific and operational requirements: (i) GCN enhancement for reporting of tide gauge data in near-real time; and (ii) to add and perform continuous Global Navigation Satellite System (GNSS) measurements at or in the vicinity of the tide gauge benchmark (TGBM) for all GCN stations."