Ngs Geodetic Tool Kit, Part II : The On-Line Positioning User Service (Opus)

By Mader, G. L.

Excerpt
Excerpt: This article is available (with images) in PDF format (608 Kb). The National Geodetic Survey (NGS) officially began public operation of the web-based On-line Positioning User Service (OPUS) in March 2001 as a means to provide GPS users easier access to the National Spatial Reference System (NSRS). Through OPUS, our goal is to provide the means to accurately, reliably, and quickly obtain consistent geodetic positions. OPUS allows users to submit their GPS data files in receiver independent exchange (RINEX) format to NGS via the Web, whereupon the data will be processed to determine a position using NGS computers and software. Each RINEX file that is submitted will be processed with respect to three reference sites, which may be National Continuously Operating Reference Stations (CORS) or International GPS Service (IGS) sites. OPUS will try to select the three sites nearest to the user?s location but will expand the search based on data availability and quality. NGS has also introduced a new feature where the user may select one, two or all three of the reference sites from a list of available reference stations. This list will soon also include qualifying cooperative CORS sites. If the user specifies less than three sites, then OPUS will select the remaining sites. Currently, a minimum of two hours of data are needed for OPUS to begin.

Book Id: WPLBN0000682880
Format Type: PDF eBook
File Size: 65.96 KB.
Reproduction Date: 2005
Full Text

Title:

Ngs Geodetic Tool Kit, Part II : The On-Line Positioning User Service (Opus)

Author:

Mader, G. L.

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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