Transcript NGOS NORDIC GEODETIC OBSERVING SYSTEM

NGOS
NORDIC GEODETIC OBSERVING
SYSTEM
NKG Task Force
Markku Poutanen, Per Knudsen, Mikael Lilje,
Hans-Peter Plag, Hans-Georg Scherneck
WHY NGOS
Much has been done over the recent years to integrate geodetic
observational infrastructure both on global and regional level into
more homogeneous networks.
The Nordic Geodetic Commission (NKG) has recognised the
necessity for contributions to global geodetic networks as well as
regional homogenisation and standardisation.
NGOS TASK FORCE
NGOS Task Force was established in 2002 to write a paper that
defines an integrated regional approach as a major in-situ
infrastructure for geodetic observations required for a wide range of
scientific and practical applications both in the Nordic region and on
global level.
NGOS
• integrates fundamental geodetic techniques for the longterm
observation of Earth system parameters.
• NGOS is a regional implementation and densification of the
IGGOS (Integrated Global Geodetic Observing System).
• two main contributions of Geodesy to global monitoring, namely
– (1) the maintenance of a highly accurate references frame as the
backbone for all other observation systems, and
– (2) observations of key variables of the Earth system, such as
changes in its figure and gravity field, and variations in the Earth's
rotation.
• For the Nordic countries, a main focus will by on crustal motion,
dynamics of glaciated areas and sea level.
NGOS OBSERVATIONS
NGOS is envisaged to provide the necessary observations to
determine
- geodetic positions and to infer the kinematics of the Earth
surface,
- gravity and its temporal changes, and
- Earth rotation and its temporal changes.
THE DOCUMENT
… is still under preparation but will...
– describe the general frame for NGOS as a system
contributing to global and regional Earth observations.
– assesses the status quo situation of the regional geodetic
observing systems
– identifies deficiencies and gaps in the in-situ infrastructure.
– provides advice for the implementation of necessary
adaptations and potential new developments in network and
information/data management task for the observing
techniques involved.
CHAPTERS
… not finally decided but at the moment…
1. Introduction
2. Applications of Geodetic Observations
3. State-of-the-art in geodetic observing techniques
4. Towards a Geodetic Observing System in the Nordic Area
5. The Nordic Geodetic Observing System
6. Current limitations and means to progress
7. Relations between NGOS and other on-going activities
8. Conclusion
Table 1. The NGOS network.
Columns: j = approximate latitude; l = approximate longitude, h = ellipsoidal height;
VLB = VLBI; SLR = SLR; GNS = GNSS (GPS + GLONASS); DO = DORIS, AG = Absolute gravimeter, SCG =
Superconducting gravimeter; TG = Tide gauge;
CN = Control network, FP = Footprint;
ITR = ITRF point; IVS = IVS point; IGS = IGS point; ILR = ILRS point; ECG = ECGN point; EPN = EPN point;
GGP = GGP point; ESE = ESEAS point
Symbols: P = proposed; M = monument available; E = episodic measurements; R = repeated measurements;
C = continuous measurements; : = none