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| Titel |
Observation of a local gravity potential isosurface by airborne lidar of Lake Balaton, Hungary |
| VerfasserIn |
A. Zlinszky, G. Timár, R. Weber, B. Szekely, C. Briese, C. Ressl, N. Pfeifer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 5, no. 1 ; Nr. 5, no. 1 (2014-05-22), S.355-369 |
| Datensatznummer |
250115273
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| Publikation (Nr.) |
 copernicus.org/se-5-355-2014.pdf |
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| Zusammenfassung |
| Airborne lidar is a remote sensing method
commonly used for mapping surface topography in high resolution. A water
surface in hydrostatic equilibrium theoretically represents a gravity
potential isosurface. Here we compare lidar-based ellipsoidal water surface
height measurements all around the shore of a major lake with a local high-resolution quasi-geoid model. The ellipsoidal heights of the 87 km2 we
sampled all around the shore of the 597 km2 lake surface vary by
0.8 m and strong spatial correlation with the quasi-geoid undulation
was calculated (R2 = 0.91). After subtraction of the local geoid
undulation from the measured ellipsoidal water surface heights, their
variation was considerably reduced. Based on a network of water gauge
measurements, dynamic water surface heights were also successfully corrected
for. This demonstrates that the water surface heights of the lake were truly
determined by the local gravity potential. We conclude that both the level
of hydrostatic equilibrium of the lake and the accuracy of airborne lidar
were sufficient for identifying the spatial variations of gravity potential. |
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