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| Titel |
A comparison of interpolation methods on the basis of data obtained from a bathymetric survey of Lake Vrana, Croatia |
| VerfasserIn |
A. Šiljeg, S. Lozić, S. Šiljeg |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 8 ; Nr. 19, no. 8 (2015-08-24), S.3653-3666 |
| Datensatznummer |
250120795
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| Publikation (Nr.) |
 copernicus.org/hess-19-3653-2015.pdf |
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| Zusammenfassung |
The bathymetric survey of Lake Vrana included a wide range of activities
that were performed in several different stages, in accordance with the
standards set by the International Hydrographic Organization. The survey was
conducted using an integrated measuring system which consisted of three main
parts: a single-beam sonar HydroStar 4300 and GPS devices; a Ashtech
ProMark 500 base, and a Thales Z-Max® rover. A
total of 12 851 points were gathered.
In order to find continuous surfaces necessary for analysing the morphology
of the bed of Lake Vrana, it was necessary to approximate values in certain
areas that were not directly measured, by using an appropriate interpolation
method. The main aims of this research were as follows: (a) to compare the
efficiency of 14 different interpolation methods and discover the most
appropriate interpolators for the development of a raster model; (b) to
calculate the surface area and volume of Lake Vrana, and (c) to compare the
differences in calculations between separate raster models. The best
deterministic method of interpolation was multiquadric RBF (radio basis function), and the best
geostatistical method was ordinary cokriging. The root mean square error in both methods
measured less than 0.3 m.
The quality of the interpolation methods was analysed in two phases. The first
phase used only points gathered by bathymetric measurement, while the second
phase also included points gathered by photogrammetric restitution.
The first bathymetric map of Lake Vrana in Croatia was produced, as well as
scenarios of minimum and maximum water levels. The calculation also included
the percentage of flooded areas and cadastre plots in the case of a 2 m
increase in the water level. The research presented new scientific and
methodological data related to the bathymetric features, surface area and
volume of Lake Vrana. |
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