THE GIANT PROGRAM scar-ggi.au/geodesy/giant.htm

THE GIANT PROGRAM http://www.scar-ggi.org.au/geodesy/giant.htm

Working Group on Geodesy and Geographic Information (WG-GGI)

Cybercartographic Atlas of Antarctica Workshop, Ottawa 22-24 May 2002

SCAR Antarctic Geodesy Symposia Chile 1999 Warsaw 2000 St Petersburg - AGS 01 Objectives :

mid term review of workplan maintain group contact assess progress and suggest new

cooperative initiatives publish activities


SCAR BACKGROUND

ISCU Body

Origin third IGY (1957)

Coordinate cooperative research

Series of specialist working groups

Geography WG formed 1958


WG- GGI Background

WG renamed Geodesy and Cartography 1960

Renamed Geodesy and Geographic Information 1988

Structural refocussed since 1992 into a number of sub programs

Now has two major groupings plus an outreach component


ANTARCTIC GEODESY TECHNIQUES

Intercontinental Baseline accuracies Astronomical fixes +/- 400 metres Pageos (1969) +/- 10 metres Doppler (1972) +/- 5 metres Early GPS (1990) +/- 1-2 metres Continuous GPS +/- centimetres


WG-GGI PROGRAMS

Geodetic Infrastructure (GIANT)

Geographic Information

Outreach (web site etc)


GIANT

Initially conceived 1992 as application of new space Geodesy to Antarctic mapping problems

Space technological development now enables monitoring of current surface geodynamics


GEODETIC INFRASTRUCTURE OF ANTARCTICA (GIANT)

Objectives

Geodetic framework for science

basis for homogeneous spatial data

linking isolated geodetic datums

co-location of geodetic techniques


GEODETIC FRAMEWORK

Permanent GPS Base Stations Epoch GPS Campaigns VLBI DORIS Tide Gauges Absolute Gravity


Giant program components

Permanent Geodetic Observatories;

Crustal Deformation Network;

Physical Geodesy;

Geodetic Control Database;

Tide Gauge Data; Atmospheric Impact on

GPS Observations in Antarctica;

Remote Geodetic Observatories; and

New Geodetic Satellite Missions


Antarctic GPS base stations

Data from Red dots available through IGS

Data from blue dots available on request from individual researchers


Davis GPS and Glonass Antenna


Mawson GPS Antenna


Casey GPS Antenna


Mawson GPS data availability


Mawson CGPS

time series


Antarctic VLBI sites


Antarctic DORIS sites

Data available from IGN or from CDDIS


Absolute Gravity Sites


Antarctic Tide Gauge operations

IOC web site http://ioc.unesco.org/iocweb/default.htm

Southern Ocean

Sea level centre http://www.ntf.flinders

.edu.au/TEXT/PRJS/

SOUTH/south.html


GLONASS orbits and comparisons : IGLOS Electronic Mail

Permanent receivers at

Davis, McMurdo, O’Higgins

Product access : By anonymous ftp to

http://igs.ifag.de


Difference between OSU91 & EGM96 Gravity Models


GPS EPOCH CAMPAIGNS

1989 -feasibility 1990 - pilot 1991 - CIGNET 1992 - Major

Campaign 1993 Minor 1994 Minor

1995 - Major 1996 Minor 1997 - Major 1998 Minor 1999 2000


Primary ITRF2000 Sites and Collocated Techniques


Horizontal vectors from SCAR ITRF 2000 solution


ITRF2000 Antarctic Velocities (m/yr)ID DOMES LATv LONv HGTv

7400 41705M001 0.0163 0.0189 0.0047ART1 66017M001 0.0161 0.0068 0.0001BEL1 66018M001 0.0105 0.0119 0.0347BELG 66018M002 0.0105 0.0119 0.0347BRAZ 41606M001 0.0125 -0.0039 0.0016CAS1 66011M001 -0.0096 0.0026 0.0037DAL1 66019M001 0.0142 0.0077 0.0019DALL 66019M002 0.0142 0.0077 0.0019DAV1 66010M001 -0.0048 -0.0015 0.0043DUM1 91501M001 -0.0081 0.0116 -0.0009ELE1 66021M001 0.0141 0.0062 0.0024ESP1 66022M001 0.0097 0.0142 0.0102FOR1 66023M001 0.0058 -0.0009 0.0079FOR2 66023M002 0.0058 -0.0009 0.0079FOS1 66024M001 0.0107 0.0129 0.0007GOUG 30608M001 0.0185 0.0202 -0.0017GRW1 66012M001 0.0162 0.0086 0.0075KERG 91201M002 -0.0031 0.0060 0.0050KOUR 97301M210 0.0120 -0.0045 0.0026LPGS 41510M001 0.0114 -0.0017 0.0011MAC1 50135M001 0.0304 -0.0108 0.0001


SUMMARY GIANT provides a fiducial framework of

permanent sites Contemporary velocities at permanent

and remote sites Linkages at fiducial sites to other

techniques - VLBI, Tide Gauges, Gravity

Contributions to global geodesy


GIANT Ongoing Strategy

Encourage establishment of IGS stations and use of IGS procedures

Open data from base stations Access to RINEX and SINEX results Produce integrated solutions for ITRF

densification Official published verified results in ITRF


GIANT STRATEGY Continue as the overall linking

mechanism for Antarctic Geodesy Encourage participation in building a

combined cooperative network Use of one reference frame for positions use of web site for meta data and

information access


SCAR WG-GGI Highlights ADD Composite Gazetteer Map and chart catalogue Specifications for GIS Contribution to Global Map project Permanent network of geodetic

observatories Global orbits and ITRF primary datum Densification of ITRF2000 Absolute gravity

THE GIANT PROGRAM scar-ggi.au/geodesy/giant.htm

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