| The contribution of the GRAV-D airborne gravity to geoid determination in the Great Lakes region - :13760 | National Ocean Service (NOS)
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The contribution of the GRAV-D airborne gravity to geoid determination in the Great Lakes region
  • Published Date:
    2016
  • Source:
    Geophysical Research Letters, 43(9), 4358-4365.
Filetype[PDF-3.04 MB]


Details:
  • Description:
    The current official North American Vertical Datum of 1988 (NAVD 88) and the International Great Lakes Datum of 1985 (IGLD 85) will be replaced by a new geoid-based vertical datum in 2022. The Gravity for the Redefinition of the American Vertical Datum (GRAV-D) project collects high-quality airborne gravity data to improve the quality of the gravitational model that underpins the geoid model. This paper validates the contribution of GRAV-D data in the Great Lakes region. Using the lake surface height measured by satellite altimetry as an independent data set, Global Gravity Models (GGMs) with/without the GRAV-D data are compared. The comparisons show that the improvement reaches decimeters over Lake Michigan where the historic gravity data have significant errors. Over all lakes, except Lake Erie, the GRAV-D data improve the accuracy of the gravitational model to 1-3 cm.

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