干旱区生态环境知识资源中心(Arid): Quantitative extraction of the bedrock exposure rate based on unmanned aerial vehicle data and Landsat-8 OLI image in a karst environment

Arid

	Quantitative extraction of the bedrock exposure rate based on unmanned aerial vehicle data and Landsat-8 OLI image in a karst environment
	Wang Hongyan; Li Qiangzi; Du Xin; Zhao Longcai
来源期刊	Frontiers of Earth Science
ISSN	2095-0195
出版年	2018
卷号	12 期号:3 页码:481-490
英文摘要	In the karst regions of southwest China, rocky desertification is one of the most serious problems in land degradation. The bedrock exposure rate is an important index to assess the degree of rocky desertification in karst regions. Because of the inherent merits of macro-scale, frequency, efficiency, and synthesis, remote sensing is a promising method to monitor and assess karst rocky desertification on a large scale. However, actual measurement of the bedrock exposure rate is difficult and existing remote-sensing methods cannot directly be exploited to extract the bedrock exposure rate owing to the high complexity and heterogeneity of karst environments. Therefore, using unmanned aerial vehicle (UAV) and Landsat-8 Operational Land Imager (OLI) data for Xingren County, Guizhou Province, quantitative extraction of the bedrock exposure rate based on multi-scale remote-sensing data was developed. Firstly, we used an object-oriented method to carry out accurate classification of UAVimages. From the results of rock extraction, the bedrock exposure rate was calculated at the 30 m grid scale. Parts of the calculated samples were used as training data; other data were used for model validation. Secondly, in each grid the band reflectivity of Landsat-8 OLI data was extracted and a variety of rock and vegetation indexes (e.g., NDVI and SAVI) were calculated. Finally, a network model was established to extract the bedrock exposure rate. The correlation coefficient of the network model was 0.855, that of the validation model was 0.677 and the root mean square error of the validation model was 0.073. This method is valuable for wide-scale estimation of bedrock exposure rate in karst environments. Using the quantitative inversion model, a distribution map of the bedrock exposure rate in Xingren County was obtained.
英文关键词	bedrock exposure rate quantitative extraction UAV and Landsat-8 OLI data karst rocky desertification
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:6326491
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335997
作者单位	Wang Hongyan, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China.; Li Qiangzi, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China.; Du Xin, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China.; Zhao Longcai, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China.
推荐引用方式 GB/T 7714	Wang Hongyan,Li Qiangzi,Du Xin,et al. Quantitative extraction of the bedrock exposure rate based on unmanned aerial vehicle data and Landsat-8 OLI image in a karst environment[J],2018,12(3):481-490.
APA	Wang Hongyan,Li Qiangzi,Du Xin,&Zhao Longcai.(2018).Quantitative extraction of the bedrock exposure rate based on unmanned aerial vehicle data and Landsat-8 OLI image in a karst environment.Frontiers of Earth Science,12(3),481-490.
MLA	Wang Hongyan,et al."Quantitative extraction of the bedrock exposure rate based on unmanned aerial vehicle data and Landsat-8 OLI image in a karst environment".Frontiers of Earth Science 12.3(2018):481-490.