Vol15 No.8: 1728-1740
【Title】Re-delineating mountainous areas with three topographic parameters in Mainland Southeast Asia using ASTER global digital elevation model data
【Author】XIAO Chi-wei1,2; LI Peng1,2; FENG Zhi-ming1,2*
【Addresses】1 Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; 2 College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
【Corresponding author】FENG Zhi-ming
【Citation】Xiao CW, Li P, Feng ZM (2018) Re-delineating mountainous areas with three topographic parameters in Mainland Southeast Asia using ASTER global digital elevation model data. Journal of Mountain Science 15(8). https://doi.org/10.1007/s11629-017-4746-8
【Abstract】Tropical mountainous areas not only provide substantial carbon storage and play an important role in global biological diversity, but also provide basic livelihood for a large number of poor ethnic minorities. However, there is no unified and explicit definition for mountainous areas. The local elevation range (LER) is a crucial structural parameter for delineating mountainous areas. However, current LER products are limited by the subjective selection of an optimum statistical window or coarser spatial resolution of topographical data. In this study, we presented an approach using thresholds for three topographic parameters, elevation, slope, and LER, derived from the Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Digital Elevation Model (ASTER GDEM) to re-delineate the vast mountainous areas of mainland Southeast Asia (MSEA). The mean change-point analysis method was applied to determine the optimum statistical window of the 1 arc second (approximately30 m)-resolution GDEM LER. The results showed that: First, the optimum statistical window is 38 × 38 cell units (width × height) in a rectangular neighborhood, or an area of about 1.30 km2 for calculating GDEM LER in MSEA. Second, the LER of more than 80% of the area ranges from 30 m to 499 m in MSEA. The LERs in the northern and northwestern MSEA are greater than their counterparts in the south and east. Third, the area of the re-delineated mountainous areas was 83.52 × 104 km2, about 38.71% of the total area. Spatially, the mountainous areas are mainly distributed in the north and northeast of MSEA. The re-delineated 30-m resolution map of the mountainous areas will serve as a topographical dataset for monitoring mountain-related land surface changes in MSEA. The parameter-modified mountain extraction procedure can be expanded to delineate global mountainous areas.
【Keywords】Mountainous areas; Local elevation range (LER); Statistical analysis; Global digital elevation model; Mainland Southeast Asia (MSEA)