National Vdatum -- the Implementation of a National Vertical Datum Transformation Database

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【标题】National Vdatum -- the Implementation of a National Vertical Datum Transformation Database

【作者】 Bruce Parker  Dennis Milbert  Kurt W. Hess  Stephen Gill 

【摘要】The National Ocean Service (NOS) in NOAA has developed a vertical datum transformation tool; VDatum; which allows transformation of bathymetric and/or topographic elevation data among 28 different orthometric; ellipsoid/3-D; and tidal datums. Expansion of VDatum to nationwide coverage; that is; the development and population of national vertical datum transformation database (“National VDatum”); will enable NOAA and other agencies and institutions collecting coastal and offshore spatial data to seamlessly integrate that data despite different vertical datums used. National VDatum will also allow full advantage to be taken of the power of new technologies such as real-time kinematic (RTK) GPS and topographic and bathymetric LIDAR. With VDatum; RTK-GPS hydrographic surveys will not need water level stations installed during the survey; settlement and squat corrections for the survey vessel; or post-survey data processing. With VDatum; topographic LIDAR data can be transformed to the mean high water (MHW) datum to produce a consistently defined MHW shoreline. Bathymetric LIDAR data can be transformed to produce a consistently defined mean lower low water line. National VDatum is also a requirement for producing a true National Bathymetric Database. The use of VDatum will be a cornerstone of the new way that NOS will acquire; handle and process bathymetric and shoreline data and efficiently use these data to produce NOAA nautical chart and electronic vector products and to support coastal resource managers.

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