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Height Modernisation

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  1. Height Modernisation ICSM GTSC F2F September 2004

  2. What JP’s are included so far

  3. What else do we have • QLD (~ 290 extra points) • NSW (~70 new test points) • SA (~50 SASZ points) • WA (Perth Metro and other GPS points) • TAS (lower order GPS – AHD test points) • NT (TGN points)

  4. What have we been doing • Jurisdictions checking ANLN height difference looking for improvements • Jurisdictions checking adopted BM heights • GA, Curtin, Uni Melb looking at gridding / surface fitting algorithms • GA updating sections where they need it (WA and SA)

  5. Points in ANLN adjustment6000’s are JP connection9000’s are GPS only points

  6. First attempt at Surface fitting 85% under 0.3m

  7. What’s coming up • Produce preliminary correction surface with AG98 for testing • AUSgeoid200? development (late 2004) • Produce new combined geoid / correction model • Release to jurisdictions for testing

  8. How will it be done • Curtin recommend collocation using all possible data including “test” data • Testing done by iteratively removing one point at a time • Need uncertainties on AHD values and ellipsoidal heights