International Celestial Reference Frame (ICRF) Value Stream
F1 · Astrometric & Geodetic VLBI Observations
EGV Level: Basis → Level 1
VLBI network
Raw quasar recordings
Capabilities (avg maturity)
Equipment Calibration and Maintenance3.3
Ground-Based Asset Management2.5
VLBI Data Acquisition and Storage3.0
Weakest: Ground-Based Asset Management (2.5)
F2 · Raw Data Logistics & Telemetry
EGV Level: Basis → Level 1
Physical disk shipment
e-VLBI transfer
Capabilities (avg maturity)
Network Operations2.0
Weakest: Network Operations (2.0)
F4 · Interferometric Correlation & Fringe-Fitting
EGV Level: Level 1 (intermediate)
Correlation centres
Group delay & delay rate
Capabilities (avg maturity)
Geodetic Software and Tools2.0
Weakest: Geodetic Software and Tools (2.0)
F3 · Primary Archiving & Metadata Registration
EGV Level: Level 1
IVS Primary Data Centres ×3
Archived observables
Capabilities (avg maturity)
Data Preservation2.0
Data Quality Management2.0
Weakest: Data Preservation (2.0)
F5 · Astrometric VLBI Analysis
EGV Level: Level 1 → 2 (intermediate)
IVS Analysis Centres
Independent source catalogues
Capabilities (avg maturity)
Geodetic Software and Tools2.0
Knowledge Management1.3
Training and Education1.7
VLBI Data Processing and Analysis2.3
Weakest: Knowledge Management (1.3)
F6 · ICRS Multi-Catalogue Combination
EGV Level: Level 3 (Global Reference Frames — ICRF)
IAU / IERS working group
Candidate ICRF realisation
Capabilities (avg maturity)
Geodetic Data Products (EOP Clocks Orbits Station Positions Gravity Models))2.8
Reference Frames3.0
Research and Development Prototyping3.0
Weakest: Geodetic Data Products (EOP Clocks Orbits Station Positions Gravity Models)) (2.8)
F7 · Astrophysical Source Structure & Validation
EGV Level: Level 3 (pre-designation)
Gaia optical comparison
Defining-source refinement
Capabilities (avg maturity)
Standards Development and Promotion3.0
Weakest: Standards Development and Promotion (3.0)
F8 · Formal IAU Designation & Dissemination
EGV Level: Level 3 (validated Celestial Reference Frame)
IAU General Assembly adoption
IERS ICRS Centre publication
Capabilities (avg maturity)
Data Distribution2.0
Geodetic Services2.0
Regulatory Compliance3.0
Weakest: Data Distribution (2.0)
Press enter or space to select a node. You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.
Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.