DEBRIS-COVERED GLACIERS
; SURFACE TEMPERATURE RETRIEVAL
; TIBETAN PLATEAU
; SATELLITE DATA
; LANDSAT IMAGERY
; RANDOM FORESTS
; INVENTORY DATA
; MASS-BALANCE
; AREA CHANGES
; RIVER-BASIN
WOS学科分类:
Remote Sensing
WOS研究方向:
Remote Sensing
英文摘要:
Glaciers in the Tibetan Plateau are an important indicator of climate change. Automatic glacier facies mapping utilizing remote sensing data is challenging due to the spectral similarity of supraglacial debris and the adjacent bedrock. Most of the available glacier datasets do not provide the boundary of clean ice and debris-covered glacier facies, while debris-covered glacier facies play a key role in mass balance research. The aim of this study was to develop an automatic algorithm to distinguish ice cover types based on multi-temporal satellite data, and the algorithm was implemented in a subregion of the Parlung Zangbo basin in the southeastern Tibetan Plateau. The classification method was built upon an automated machine learning approach: Random Forest in combination with the analysis of topographic and textural features based on Landsat-8 imagery and multiple digital elevation model (DEM) data. Very high spatial resolution Gao Fen-1 (GF-1) Panchromatic and Multi-Spectral (PMS) imagery was used to select training samples and validate the classification results. In this study, all of the land cover types were classified with overall good performance using the proposed method. The results indicated that fully debris-covered glaciers accounted for approximately 20.7% of the total glacier area in this region and were mainly distributed at elevations between 4600 m and 4800 m above sea level (a.s.l.). Additionally, an analysis of the results clearly revealed that the proportion of small size glaciers (<1 km(2)) were 88.3% distributed at lower elevations compared to larger size glaciers (1 km(2)). In addition, the majority of glaciers (both in terms of glacier number and area) were characterized by a mean slope ranging between 20 degrees and 30 degrees, and 42.1% of glaciers had a northeast and north orientation in the Parlung Zangbo basin.
1.Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Delft Univ Technol, Dept Geosci & Remote Sensing, Stevinweg 1, NL-2628 CN Delft, Netherlands
Recommended Citation:
Zhang, Jingxiao,Jia, Li,Menenti, Massimo,et al. Glacier Facies Mapping Using a Machine-Learning Algorithm: The Parlung Zangbo Basin Case Study[J]. REMOTE SENSING,2019-01-01,11(4)