Is australian data really validating egm08 or is egm08 just in validating australian data
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IS AUSTRALIAN DATA REALLY VALIDATING EGM08, OR IS EGM08 JUST IN/VALIDATING AUSTRALIAN DATA? PowerPoint PPT Presentation


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IS AUSTRALIAN DATA REALLY VALIDATING EGM08, OR IS EGM08 JUST IN/VALIDATING AUSTRALIAN DATA?. Sten Claessens, Will Featherstone, Ira Anjasmara The Western Australian Centre for Geodesy & The Institute for Geoscience Research Curtin University of Technology. 24 June 2008

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IS AUSTRALIAN DATA REALLY VALIDATING EGM08, OR IS EGM08 JUST IN/VALIDATING AUSTRALIAN DATA?

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Is australian data really validating egm08 or is egm08 just in validating australian data

IS AUSTRALIAN DATA REALLY VALIDATING EGM08, OR IS EGM08 JUST IN/VALIDATING AUSTRALIAN DATA?

Sten Claessens, Will Featherstone, Ira Anjasmara

The Western Australian Centre for Geodesy &

The Institute for Geoscience Research

Curtin University of Technology

24 June 2008

GGEO2008 Conference, Chania, Greece


Is australian data really validating egm08 or is egm08 just in validating australian data

Introduction (1/1)

  • Part of the joint IGFS and IAG Inter-Commission Working Group 2 “Evaluation of Global Earth Gravity Models”

  • The tide-free releases of the PGM07A and EGM08 global geopotential models are compared to Australian data:

    • Land and marine gravity observations

    • The AUSGeoid98 regional gravimetric geoid model

    • Co-located GPS-levelling on the Australian Height Datum

    • Astrogeodetic deflections of the vertical

  • Objective: quality assessment of PGM07A and EGM08


Is australian data really validating egm08 or is egm08 just in validating australian data

Gravity data (1/2)

EGM08 Comparison - Differences with land gravity observations

EGM08 (mgal)

PGM07A (mgal)


Is australian data really validating egm08 or is egm08 just in validating australian data

Gravity data (2/2)

EGM08 Comparison - Differences with marine gravity observations

EGM08 (mgal)

PGM07A (mgal)


Is australian data really validating egm08 or is egm08 just in validating australian data

AUSGeoid98 (1/3)

EGM08 Comparison - Differences with AUSGeoid98 (2'x2')

EGM08 (m)

PGM07A (m)


Is australian data really validating egm08 or is egm08 just in validating australian data

AUSGeoid98 (2/3)

EGM08 Comparison - Differences with AUSGeoid98


Is australian data really validating egm08 or is egm08 just in validating australian data

AUSGeoid98 (3/3)

EGM08 Comparison - Differences with AUSGeoid98


Is australian data really validating egm08 or is egm08 just in validating australian data

GPS-levelling data (1/7)

EGM08 Comparison - Differences with GPS-levelling data

EGM08 (m)

PGM07A (m)


Is australian data really validating egm08 or is egm08 just in validating australian data

GPS-levelling data (2/7)

EGM08 Comparison - Differences with GPS-levelling data

bias & tilt not removed

bias & tilt removed

units: m

254 points

1013 points


Is australian data really validating egm08 or is egm08 just in validating australian data

GPS-levelling data (3/7)

EGM08 Comparison - Differences with GPS-levelling data

Southwest Seismic Zone

EGM08 (m)

bias & tilt removed

PGM07A (m)

bias & tilt removed


Is australian data really validating egm08 or is egm08 just in validating australian data

GPS-levelling data (4/7)

EGM08 Comparison - Differences with GPS-levelling data

South Australian Seismic Zone

EGM08 (m)

bias & tilt removed

PGM07A (m)

bias & tilt removed


Is australian data really validating egm08 or is egm08 just in validating australian data

GPS-levelling data (5/7)

EGM08 Comparison - Differences with GPS-levelling data

bias & tilt not removed

bias & tilt removed

units: m

Southwest

South Australia


Is australian data really validating egm08 or is egm08 just in validating australian data

GPS-levelling data (6/7)

EGM08 Comparison - Differences with GPS-levelling data

South Australian Seismic Zone

EGM08

AUSGeoid98


Is australian data really validating egm08 or is egm08 just in validating australian data

GPS-levelling data (7/7)

EGM08 Comparison - Differences with GPS-levelling data

South Australian Seismic Zone

EGM08

EGM96


Is australian data really validating egm08 or is egm08 just in validating australian data

Astrogeodetic deflections (1/3)

EGM08 Comparison - Differences with E-W astrogeodetic deflections

EGM08 (arcsec)

PGM07A (arcsec)


Is australian data really validating egm08 or is egm08 just in validating australian data

Astrogeodetic deflections (2/3)

EGM08 Comparison - Differences with N-S astrogeodetic deflections

EGM08 (arcsec)

PGM07A (arcsec)


Is australian data really validating egm08 or is egm08 just in validating australian data

Astrogeodetic deflections (3/3)

EGM08 Comparison - Differences with astrogeodetic deflections

E-W deflections

N-S deflections

units: arcseconds


Is australian data really validating egm08 or is egm08 just in validating australian data

Conclusions (1/1)

  • PGM07A and EGM08 fit all Australian data better than any other model previously tested

  • EGM08 slightly improves on PGM07A in the comparisons to GPS-levelling data

  • PGM07A and EGM08 confirm the already-known deficiencies in the Australian data (implicit validation)

  • True validation of PGM07A and EGM08 cannot be claimed

  • PGM07A and EGM08 are good models over Australia


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