This document provides general guidance for the determination of vertical land motion at longterm... more 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. Thi...
IGARSS 2003. 2003 IEEE International Geoscience and Remote Sensing Symposium. Proceedings (IEEE Cat. No.03CH37477), 2003
We present calibration results from Jason-1 (2002-) and TOPEX/Poseidon (1992-) overflights of ded... more We present calibration results from Jason-1 (2002-) and TOPEX/Poseidon (1992-) overflights of dedicated verification sites on the Mediterranean island of Corsica and on a California offshore oil platform (Harvest). Harvest served for a decade (1992-2002) as a calibration site for the TOPEX/Poseidon (T/P) mission, and is serving in a similar capacity for Jason-1. Initiated in 1996, the Corsica experiment features
Conference Proceedings on Engineering in the Ocean Environment, 1990
The National Ocean Service began implementing the Next Generation Water Level Measurement System ... more The National Ocean Service began implementing the Next Generation Water Level Measurement System (NGWLMS) field measurement systems into the National Water Level Observation Network (NWLON) in July of 1988. At present, there are approximately 75 NGWLMS systems installed. With the exception of Global Sea Level Network stations and special project stations, the new systems are being operated side-by-side with the
Issues affecting the utility and accuracy of water level measurements for storm surge are address... more Issues affecting the utility and accuracy of water level measurements for storm surge are addressed. Vertical datum control (including land elevation measurements), water level sensor survivability, and sensor placement are critical to obtaining useful information on storm surge. Hurricane Dennis in 2005 provides an example of how water level measurements are used to evaluate and improve storm surge prediction models. A water level gauge operated by the University of South Florida Coastal Ocean Monitoring and Prediction System (COMPS) was the only site to capture time history of the maximum surge that occurred in Apalachee Bay, Florida, leading to improvements in the storm surge prediction model. A more dense network of water level gauges, as a component of the U.S. Integrated Ocean Observing System, will enable a more efficient response to and mitigation of future storm surge events.
Three in situ water level measurement systems have been installed on Platform Harvest in support ... more Three in situ water level measurement systems have been installed on Platform Harvest in support of the TOPEX/Poseidon Satellite Verification Experiment. Each of the systems have fundamentally different instrument configurations, which provides a unique simultaneous set of measurements in a deep water‐exposed near‐shore environment. Each of the sensor “zeros”; have also been referenced to the same datum as a requirement of the experiment; thus absolute differences can be analyzed. Straightforward, simple comparisons of the systems are presented for TOPEX/Poseidon cycles 2 through 30. The systems are shown to agree well both in the mean and in frequency content. Nontidal sea level residuals are shown to be highly correlated to atmospheric pressure.
This document provides general guidance for the determination of vertical land motion at longterm... more 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. Thi...
IGARSS 2003. 2003 IEEE International Geoscience and Remote Sensing Symposium. Proceedings (IEEE Cat. No.03CH37477), 2003
We present calibration results from Jason-1 (2002-) and TOPEX/Poseidon (1992-) overflights of ded... more We present calibration results from Jason-1 (2002-) and TOPEX/Poseidon (1992-) overflights of dedicated verification sites on the Mediterranean island of Corsica and on a California offshore oil platform (Harvest). Harvest served for a decade (1992-2002) as a calibration site for the TOPEX/Poseidon (T/P) mission, and is serving in a similar capacity for Jason-1. Initiated in 1996, the Corsica experiment features
Conference Proceedings on Engineering in the Ocean Environment, 1990
The National Ocean Service began implementing the Next Generation Water Level Measurement System ... more The National Ocean Service began implementing the Next Generation Water Level Measurement System (NGWLMS) field measurement systems into the National Water Level Observation Network (NWLON) in July of 1988. At present, there are approximately 75 NGWLMS systems installed. With the exception of Global Sea Level Network stations and special project stations, the new systems are being operated side-by-side with the
Issues affecting the utility and accuracy of water level measurements for storm surge are address... more Issues affecting the utility and accuracy of water level measurements for storm surge are addressed. Vertical datum control (including land elevation measurements), water level sensor survivability, and sensor placement are critical to obtaining useful information on storm surge. Hurricane Dennis in 2005 provides an example of how water level measurements are used to evaluate and improve storm surge prediction models. A water level gauge operated by the University of South Florida Coastal Ocean Monitoring and Prediction System (COMPS) was the only site to capture time history of the maximum surge that occurred in Apalachee Bay, Florida, leading to improvements in the storm surge prediction model. A more dense network of water level gauges, as a component of the U.S. Integrated Ocean Observing System, will enable a more efficient response to and mitigation of future storm surge events.
Three in situ water level measurement systems have been installed on Platform Harvest in support ... more Three in situ water level measurement systems have been installed on Platform Harvest in support of the TOPEX/Poseidon Satellite Verification Experiment. Each of the systems have fundamentally different instrument configurations, which provides a unique simultaneous set of measurements in a deep water‐exposed near‐shore environment. Each of the sensor “zeros”; have also been referenced to the same datum as a requirement of the experiment; thus absolute differences can be analyzed. Straightforward, simple comparisons of the systems are presented for TOPEX/Poseidon cycles 2 through 30. The systems are shown to agree well both in the mean and in frequency content. Nontidal sea level residuals are shown to be highly correlated to atmospheric pressure.
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