Comparison of national vertical and chart datums with WGS 84 (EGM96) geoid

Author

Fell, P. ; Tanembaum, M.

Author_Institution

Naval Surface Warfare Center, Dahlgren, VA, USA

Volume

2

fYear

2002

fDate

29-31 Oct. 2002

Firstpage

1121

Abstract

In 2001, the National Imagery and Mapping Agency (NIMA) initiated a project with the Naval Surface Warfare Center (i) to examine transformations from national vertical data to the World Geodetic System 1984 and (ii) to address the potential for converting bathymetric depths from coastal hydrographic charts to WGS 84. This paper discusses findings obtained during the project. Systematic differences between various national vertical data and WGS 84 were determined and modeled. These models enable elevations or orthometric heights to be transformed with a better "fit" between local vertical data and the WGS 84 geoid. A concept for addressing hydrographic chart depth conversion based on GPS positioning of the chart data (e.g. Mean Low Low Water) was also examined. Results along the southeastern United States coast are presented.

Keywords

Global Positioning System; geodesy; geographic information systems; AD 2001; EGM96 geoid; GPS positioning; NIMA; National Iimagery and Mapping Agency; Naval Surface Warfare Center; WGS 84 geoid; World Geodetic System 1984; bathymetric depths; coastal hydrographic charts; hydrographic chart depth conversion; mean low low water; national chart data; national vertical data; orthometric height; southeastern United States coast; Ellipsoids; Equations; Geodesy; Global Positioning System; Gravity; Image converters; Land surface; Modems; Sea measurements; Sea surface;

fLanguage

English

Publisher

ieee

Conference_Titel

OCEANS '02 MTS/IEEE

Print_ISBN

0-7803-7534-3

Type

conf

DOI

10.1109/OCEANS.2002.1192123

Filename

1192123