Objectives
Because of accuracy, ability to provide results in a global reference frame,
and low cost of receivers and versatility, Global Navigation Satellite Systems
(GNSS) are presently the main sensor of the Earth's surface deformation.
Consequently, GNSS networks have been installed all over the world and
repeated GNSS campaigns are conducted to monitor ground deformations.
In addition, a large number of Continuous Operating GNSS Reference Stations
(CORS) are operating today for multi-disciplinary applications ranging
from surveying to numerical weather prediction.
The regional sub-commissions within IAG sub-commission 1 "Regional
Reference Frames" have already made a first step in coordinating
these activities in order maintain their regional reference systems.
This working group aims at joining the efforts of the regional
sub-commissions together with the groups processing local/regional
CORS or repeated GNSS campaigns with the following goals:
- Define specifications and quality standards for the regional SINEX solutions and relevant meta-data,
- Collect SINEX solutions and their meta-data,
- Study in-depth the individual strengths and shortcomings of local/regional and continuous/epoch GNSS solutions to determine site velocities,
- Define optimal strategies for the combination of regional and global SINEX solutions,
- Provide dense regional velocity fields,
- Provide the densification of the ITRF2005 (or its successor),
- Encourage participation in related symposia,
- Implement a web site in order to provide information on the activities and access to the products of the WG,
- Prepare recommendations and a comprehensive final report on the WG activities.