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NOAA guidance document for determination of vertical land motion at water level stations using GPS technology
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  • Description:
    "This document provides general guidance for the determination of vertical land motion at longterm continuously operating water level stations, for the purpose of separating this signal from relative water level change as measured at the water level station and the subsequent determination of absolute water level change. While there are several ways to determine absolute vertical land motion (within the context of a global terrestrial reference frame) that affect a water level station, the most accurate methods or approaches all require the use of Global Navigation Satellite System (GNSS) technology in some fashion. GNSS is a constellation of satellites that are used to precisely determine the geographic location of a user's receiver anywhere in the world. The GNSS includes satellite systems such as GPS, GLONASS (Russian), Galileo (European), and others. Continuously operating long-term GPS systems that use GNSS technology are generically referred to as cGPS or CORS stations. This guidance is based on experiences and standard operating procedures of the NOAA NGSmanaged network of Continuously Operating Reference Stations (CORS) and NOAA CO-OPSmanaged National Water Level Observation Network (NWLON) and is targeted toward a general audience. This guidance could also apply to any group wanting to establish a long-term water level gauge and monitor the vertical land motion which affects it"--Introduction.
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