Author(s)

Marco A. Contreras¹, Wesley Staats², Jian Yiang³, David Parrott²

¹Associate Professor of Forest Management, Department of Forestry, College of Agriculture, Food and Environment, University of Kentucky, Lexington, Kentucky, USA.
²Research Assistant, Department of Forestry, College of Agriculture, Food and Environment, University of Kentucky, Lexington, Kentucky, USA.
³Assistant Professor of Landscape Ecology, Department of Forestry, College of Agriculture, Food and Environment, University of Kentucky, Lexington, Kentucky, USA.

Digital elevation models (DEMs) derived from light detection and ranging (LiDAR) technology are becoming the standard in representing terrain surfaces. They have numerous applications in forestry, agriculture, and natural resources. Although elevation errors are much lower than those derived from traditional methods, accuracies have been reported to decrease with terrain slope and vegetation cover. In this study, we quantified the accuracy of airborne LiDAR-derived DEM in deciduous eastern forests of the Cumberland Plateau. We measured relative elevation changes within field plots located across different slope and ruggedness classes to quantify DEM accuracy. We compared elevation change errors of DEMs derived from three LiDAR datasets: a low-density (~1.5 pts•m⁻²), a high-density (~40 pts•m⁻²), and a combined dataset. We also compared DEMs obtained by interpolating the ground points using four interpolation methods. Results indicate that mean elevation change error (MECE) increased with terrain slope and ruggedness with an average of 73.6 cm. MECE values ranged from 23.2 cm in areas with lowest slope (0% - 39%) and ruggedness (0% - 28%) classes to 145.5 cm in areas with highest slope (50% - 103%) and ruggedness (46% - 103%) classes. We found no significant differences among interpolation methods or LiDAR datasets; the latter of which indicates that similar accuracy levels can be achieved with the low-density datasets.

Elevation Change Error, Terrain Relief, Ruggedness and Slope, Remote Sensing

Contreras, M. , Staats, W. , Yiang, J. and Parrott, D. (2017) Quantifying the Accuracy of LiDAR-Derived DEM in Deciduous Eastern Forests of the Cumberland Plateau. Journal of Geographic Information System, 9, 339-353. doi: 10.4236/jgis.2017.93021.