Naslov
Accuracy validation and comparison of global digital elevation models over Croatia

Autori
Varga, Matej ; Bašić, Tomislav

Izvornik
International journal of remote sensing (0143-1161) 36 (2015), 1; 170-189

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Global digital elevation model; vertical accuracy; Republic of Croatia; ETOPO1; GTOPO30; SRTM30+; GMTED2010; ACE2; SRTM; ASTER

Sažetak
Accuracy assessment of digital elevation models plays an important role facing their use in geoscience applications. This study investigates the vertical accuracy of most recently published versions of global digital elevation models over Croatia: 1 arc-minute global relief model (ETOPO1), Global 30 Arc-Second Elevation (GTOPO30), SRTM30+, Global Multi-resolution Terrain Elevation Data 2010 (GMTED2010), Altimeter Corrected Elevations 2 DEM (ACE2 DEM), Shuttle Radar Topography Mission GDEM (SRTM GDEM) and Advanced Spaceborne Thermal Emission and Reflection GDEM (ASTER GDEM). The geodetic ground control points (benchmarks) allowed the comparison in terms of vertical accuracy. Additionally, the differences between models in the identical points were determined and analyzed after adjusting the models to the same resolution. The results have yielded information about the overall accuracy of models, the accuracy depending on height, land cover and slope, presence of large and systematic errors, and mutual agreement between the models. Overall vertical accuracies according to the root mean square error over Croatia are: ETOPO1 27.6 m, GTOPO30 21.6 m, SRTM30+ 21.3 m, GMTED2010 7.4 m, ACE2 DEM 4.5 m, SRTM GDEM 3.8 m and ASTER GDEM 7.1 m. The highest accuracy was shown by SRTM GDEM version 3, which is far better than previously released. All models have proved to be worse in the rough and forest areas, whereas in flat and barelands, new-generation global DEMs SRTM GDEM and ASTER GDEM are highly accurate.

Izvorni jezik
Engleski

Znanstvena područja
Geodezija

POVEZANOST RADA