References of "Schenewerk, M"
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See detailSeasonal Motion in the Annapolis, Maryland GPS Monument
Schenewerk, M.; van Dam, Tonie UL; Nerem, Steven R.

in GPS Solutions (1999), 2(3), 41-49

The permanent GPS tracking site at Annapolis, MD shows a 7-mm seasonal signal primarily in its horizontal position. It is suggested that thermal expansion of the pier on which the antenna rests is the ... [more ▼]

The permanent GPS tracking site at Annapolis, MD shows a 7-mm seasonal signal primarily in its horizontal position. It is suggested that thermal expansion of the pier on which the antenna rests is the source of this motion. A simple numerical model of the pier reproduces the observed motion of the GPS antenna, lending credence to this hypothesis. Although adding an additional level of complexity, this motion is predictable and the site retains it s value for high precision monitoring. Although the arrangement of this GPS site it somewhat uncommon, these results emphasize the importance of the underlying antenna monumentation when measuring crustal motions. [less ▲]

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See detailA detailed analysis of tropospheric effects on geodetic observations at TMGO
Schenewerk, M.; van Dam, Tonie UL; Sasagawa, G. et al

in Physics and chemistry of the earth (1998), 23(1), 103-106

Improvements in geodetic tools are making previously subtle effects significant. Two examples affecting GPS observations are atmospheric loading of the Earth's crust and the tropospheric delays ... [more ▼]

Improvements in geodetic tools are making previously subtle effects significant. Two examples affecting GPS observations are atmospheric loading of the Earth's crust and the tropospheric delays, specifically the wet component. Each measurement, tropospheric delays and site coordinates, requires unambiguous determination of the other to achieve the highest accuracy. Table Mountain Geophysical Observatory (TMGO) is a unique site where a long history of observations from two complementary techniques, GPS and superconducting gravimetry, have been accrued. In particular, the superconducting gravity measurements provide a unique baseline for evaluating GPS vertical estimates over a variety of time frames. Positional estimates for TMGO using these techniques will be compared. Tropospheric effects will be identified and discussed. The ability for GPS to make subdaily, daily, and long term vertical estimates will be evaluated. [less ▲]

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See detailSea-level rise studied in Chesapeake Bay as wetlands loss continues
Nerem, R. S.; Schenewerk, M.; van Dam, Tonie UL

in Earth in Space (1998), 10(12), 156-157

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See detailChesapeake Bay subsidence monitored as wetlands loss continues
Nerem, R. S.; van Dam, Tonie UL; Schenewerk, M.

in EOS : Transactions, American Geophysical Union (1998), 79

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