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Co-Ops Gps Observations Implementation Plan

By National Oceanic and Atmospheric Administration

Excerpt
Excerpt: GPS OBSERVATIONS IMPLEMENTATION PLAN. In support of the National Geodetic Survey?s (NGS) Height Modernization program, the Federal Base Network, and Cooperative Base Network, CO-OPS shall initiate a program in 2003 of making periodic GPS observations at water level stations, as resources permit. CO-OPS activities shall be coordinated with NGS activities for best use of available resources. Precise positioning of NWLON stations in a global geocentric reference framework is needed to support NOS marine safe navigation and height modernization projects, in addition to monitoring vertical crustal motion for absolute sea level and global climate change studies. An ellipsoid height (h) is the distance from a point on the Earth?s surface measured along a line perpendicular to a mathematically defined reference ellipsoid. GPS is used to measure the ellipsoid height of a point relative to the reference ellipsoid, which presently is World Geodetic System 1984 (WGS84). WGS 84 is an earth-centered, earth-fixed coordinate system. Refer to DMA Technical Report, Department of Defense World Geodetic System 1984, DMA TR 8350.2, for a definition of WGS 84 and relationships with other geodetic systems. For the purpose of determining GPS derived orthometric heights, WGS 84 and the North American Datum of 1983 (NAD 83) are essentially the same datum. This is important to understand when choosing a geoid model for the orthometric height computation. An orthometric height (H) is the distance from a point on the Earth?s surface measured along a line perpendicular to a reference geoid. The difference between the ellipsoid height and the orthometric height is the geoid height (N). The following simple relationship is used to determine GPS-derived orthometric heights...

Table of Contents
TABLE OF CONTENTS 1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. OBJECTIVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3. IMPLEMENTATION PLAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4. REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5. TRAINING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 6. EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 7. SCHEDULE FOR GPS OBSERVATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 8. DATABASE MANAGEMENT AND DATA SUBMISSION . . . . . . . . . . . . . . . . . . . . . 5

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Book Id: WPLBN0000693676
Format Type: PDF eBook
File Size: 81.45 KB.
Reproduction Date: 2005
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Title: Co-Ops Gps Observations Implementation Plan  
Author: National Oceanic and Atmospheric Administration
Volume:
Language: English
Subject: Science., Ecology & environment, National Oceanic and Atmospheric Administration (U.S.)
Collection: National Oceanographic Data Center
Subcollection:
Historic
Publication Date:
Publisher: Government Reference Publication
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