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首页> 外文期刊>The International Hydrographic Review >The Integration of Bathymetry, Topography and Shoreline and the Vertical Datum Transformations behind It
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The Integration of Bathymetry, Topography and Shoreline and the Vertical Datum Transformations behind It

机译：水深，地形和海岸线的整合及其背后的垂直基准转换

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The integration of bathymetry, topography, and shoreline is beneficial for a number of coastal applications. This geospatial integration begins with the blending of bathymetric and topographic data into a digital elevation model (DEM) after all data sets have been transformed to a common vertical datum. A vertical datum transformation tool, VDatum, has been developed which allows transformation among 27 different orthometric, 3-D/ellipsoid, and tidal datums. The geographic distribution of the tidal datums in VDatum are produced with a calibrated hydro-dynamic tidal model. An initial demonstration project was carried out in the Tampa Bay region where the bathymetric data from NOAA (US National Oceanic and Atmospheric Administration) was blended with the topographic data from USGS (US Geological Survey). One objective was to solve the problem of inconsistencies between NOAA's nautical charts and USGS's mapping products, especially with respect to shoreline. A method was demonstrated for determining a consistently defined mean high water (MHW) shoreline from high-resolution Lidar elevation data covering the intertidal zone after transformation of these data to the MHW datum (with the zero contour being the MHW shoreline). VDatum will also play a key role in: (1) the implementation of a seamless high-resolution National Bathymetric Database, which will support both the production of ENCs (Electronic Navigational Charts) and the GIS-based activities of coastal zone managers; (2) the ability to use quality 3rd-party bathymetric data, which in the past was a problem due to the many different datums in use; (3) marine boundary determination; and (4) the on-the-fly measurement of bathymetric data relative to chart datum (Mean Lower Low Water) in future hydrographic surveys, using VDatum to transform the RTK-GPS-referenced data to MLLW.
机译：水深测量，地形和海岸线的集成对于许多沿海应用都是有益的。这种地理空间整合始于将所有数据集转换为公共垂直基准之后，将测深和地形数据混合到数字高程模型（DEM）中。现已开发出一种垂直基准转换工具VDatum，该工具可以在27种不同的正交，3-D /椭球和潮汐基准之间进行转换。 VDatum中潮汐基准的地理分布是使用校准的水动力潮汐模型生成的。在坦帕湾地区进行了最初的示范项目，将来自NOAA（美国国家海洋和大气管理局）的测深数据与来自USGS（美国地质调查局）的地形数据进行了混合。一个目标是解决NOAA的海图与USGS的地图产品之间不一致的问题，尤其是在海岸线方面。在将这些数据转换为MHW基准面（零等高线为MHW海岸线）后，演示了一种方法，用于从覆盖潮间带的高分辨率Lidar高程数据确定一致定义的平均高水（MHW）海岸线。 VDatum还将在以下方面发挥关键作用：（1）实施无缝的高分辨率国家测深数据库，该数据库将支持ENC（电子航海图）的制作以及沿海地区管理人员基于GIS的活动； （2）使用高质量的第三方测深数据的能力，过去由于使用的基准不同，这是一个问题； （3）海洋边界确定； （4）使用VDatum将RTK-GPS引用的数据转换为MLLW，以便在将来的水文测量中即时测量与海图基准（平均低水位）相关的测深数据。

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