Antarctic Geodetic Symposium 2001, St Petersburg
GPS at Australian Tide Gauge Bench Marks (TGBM)
John ManningGary
JohnstonPaul Digney
Antarctic Geodetic Symposium 2001, St Petersburg
A network of Tide Gauges deployed at AustralianAntarctic Stations in 1992/1993. Including the establishment of TGBMs in close proximity
Continuous GPS Stations - Part of the AUSTRALIAN Regional GPS Network (ARGN),established at each permanent Australian Station in1993/1994.
Establishment in 1995 of the Southern Ocean Sea Level Centre to foster international cooperation into Southern Ocean sea level research
Background
Antarctic Geodetic Symposium 2001, St Petersburg
Activities 2000/2001 Summer
EDM-Heighting technique used to connect GPS to TGBM at both Mawson and Davis Stations
3 days GPS data observed at Davis, Mawson and Larsemann Hills TGBMs
Antarctic Geodetic Symposium 2001, St Petersburg
A comparison of GPS Heighting and Orthometric levelling between the ARGN mark and the TGBM.
Year
Baseline
2000/2001
HeightDifference(m)
Mawson Station
AUS064-AUS258( h GPS) 31.042
AUS064-AUS258( H derived) 31.052
AUS064-AUS258( H levelled) 31.035
Difference 0.017
Davis Station
AUS099-AUS186( h GPS) 23.151
AUS099-AUS186( H derived) 23.151
AUS099-AUS186( H levelled) 23.148
Difference 0.003
AUS099-NMVS4( h GPS) 25.682
AUS099-NMVS4( H derived) 25.692
AUS099-NMVS4( H levelled) 25.689
Difference 0.003
Antarctic Geodetic Symposium 2001, St Petersburg
MAWSON TGBM
Antarctic Geodetic Symposium 2001, St Petersburg
MAWSON Permanent GPS
Antarctic Geodetic Symposium 2001, St Petersburg
http://www.auslig.gov.au/geodesy/antarc/mawsontg.htm
Antarctic Geodetic Symposium 2001, St Petersburg
AUS064 & RMs
ISTS051 – RM4
AUS258
AUS300
AUS301
Two Way LevellingOne Way Levelling
Level Connections at Mawson
Antarctic Geodetic Symposium 2001, St Petersburg
Permanent GPS at Davis Station
Antarctic Geodetic Symposium 2001, St Petersburg
Antarctic Geodetic Symposium 2001, St Petersburg
EDM Height Traversing “Leap Frogging” Technique
Variant of the common technique of spirit levelling, where the differences in height between change points are determined using observations of zenith angles and slope distances.
Use of Leica TLC2000 Total Station and single fixed height survey rod and reflector
A total of 12 measurements taken to both backsight and foresight
Sight lengths kept below 50 metres
Misclose to comply with allowable maximum for SP1 Class LA - 4k
Antarctic Geodetic Symposium 2001, St Petersburg
AUS099
D3
D5
AUS303
AUS186
MET BM
NMVS 4
RM 1
SS Pin – Change Point
Bench Mark
Level Connections at Davis Station
Antarctic Geodetic Symposium 2001, St Petersburg
NMVS4Original TGBM at Davis
Antarctic Geodetic Symposium 2001, St Petersburg
http://www.auslig.gov.au/geodesy/antarc/davistg.htm
Antarctic Geodetic Symposium 2001, St Petersburg
Attempting to transfer MSL from the Tide Gauge at Davis to the TGBM
Antarctic Geodetic Symposium 2001, St Petersburg
Permanent GPS at Casey Station
Antarctic Geodetic Symposium 2001, St Petersburg
http://www.auslig.gov.au/geodesy/antarc/caseytg.htm
Antarctic Geodetic Symposium 2001, St Petersburg
TGBM Network Casey Station
Antarctic Geodetic Symposium 2001, St Petersburg
Australian TGBM (AUS334) Larsemann Hills
Antarctic Geodetic Symposium 2001, St Petersburg
Future Program
Continue monitoring the vertical connection between GPS and TGBM, by:
• levelling, by adopting at least 2nd order standards• Repeat GPS observations on TGBMs at each Station
Continue the development of fixed levelling routes to maintain consistency
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