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    Ocean Tide Loading Considerations for GPS Processing Around Australia

    18916_downloaded_stream_8.pdf (785.0Kb)
    Access Status
    Open access
    Authors
    Penna, Nigel
    Date
    2002
    Type
    Journal Article
    
    Metadata
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    Citation
    Penna, Nigel. 2002. Ocean Tide Loading Considerations for GPS Processing Around Australia. Geomatics Research Australasia 77: 1-26.
    Source Title
    Geomatics Research Australasia
    Faculty
    Division of Resources and Environment
    Department of Spatial Sciences
    URI
    http://hdl.handle.net/20.500.11937/37697
    Collection
    • Curtin Research Publications
    Abstract

    Ocean tide loading (OTL) effects are not always modelled in static GPS data processing. In some parts of North West Australia, models suggest that (predominantly vertical) OTL induced site displacements as large as 10 cm in range can occur over the course of about 6 hours. The correct mitigation of OTL effects is consequently important if station coordinates and tropospheric delays are to be estimated from GPS data with millimetric accuracy. However, adequately modelling the site displacement due to OTL is not trivial and, in addition, displacement is not necessarily largest nearest the coast, or negligible hundreds of kilometres inland. This paper reviews how OTL site displacements are modelled, and outlines some major advances made in the modelling of the ocean tides during the last decade. Expected site displacements at a selection of sites in Australia are detailed, and the paper outlines the effects of incorrect mitigation of the OTL site displacement on GPS derived parameters, with some references to existing scientific literature.

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