Precise georeferencing using on-line positioning user service (OPUS)
Soler, Tomas ... [et al.]
In 2002, the National Geodetic Survey (NGS), an office of the National Oceanic and Atmospheric Administration (NOAA) in the United States, developed a web-based service called OPUS (On-line Positioning User Service) to provide GPS users easier access to the countryys National Spatial Reference System (NSRS). OPUS allows professionals in the fields of geodesy, surveying, mapping, and GIS to submit their GPS data files to NGS headquarters, via the web, where they are processed to determine associated positional coordinates. The results are based on NGSS determined coordinates from its Continuously Operating Reference Stations (CORS) and/or the sites of the International GNSS Service (IGS). Recent investigations performed in the United States suggest, for precise surveying and geodetic applications the length of the observing sessions should be two or more hours. Results drastically improved for solutions containing more than 4 hours.
Event: XXIII International FIG Congress : Shaping the change
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