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Study on Selection of Dependent Variables of Relief Amplitude Optimum Statistical Unit in China based on GIS

Abstract— The analysis of relief amplitude has great significance for regional geomorphic classification and geological hazard risk assessment. The calculation of relief amplitude lies in the choice of statistical unit. However, the definition of optimum statistical unit is fuzzy, the accuracy and applicability of dependent variables and fitting model remain to be discussed so far. Therefore, taking SRTM-DEM data for example, this paper extracted relief amplitude in China under different grid units using ArcGIS software, respectively discussed in detail the following three aspects from mathematical model of relief amplitude: mathematical definition of relief amplitude, research ideas of optimum statistical unit, selection of dependent variables and fitting model. Research shows that: The research idea at present is different from the idea first put forward, so the corresponding calculation model required correction; We should looking for a stable point when using artificial drawing method to determine optimum statistical unit; The result of using "power model" to fit the highest frequency of relief amplitude is the most suitable, and maximum relief amplitude is not suitable for the research of nationwide optimum statistical unit as a dependent variable.

Index Terms— relief amplitude, optimum statistical unit, China, SRTM-DEM, GIS

Binbin Zhao, Wenhao Ou, Xiangze Fei, Maohua Li
China Electric Power Research Institute, CHINA
Yingtian Zhang
Xiamen Power Supply Company, State Grid Fujian Electric Power Co., Ltd., CHINA
Kun Wu
State Grid Hebei Electric Power Company, CHINA
Jianguo Ma
State Grid Hubei Electric Power Company, CHINA
Hui Sun
Economic Research Institute, State Grid Gansu Electric Power Company, CHINA
Gang Yang
State Grid Shanxi Electric Power Company, CHINA

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Cite: Binbin Zhao, Yingtian Zhang, Wenhao Ou, Xiangze Fei, Maohua L, Kun Wu, Jianguo Ma, Hui Sun, Gang Yang, "Study on Selection of Dependent Variables of Relief Amplitude Optimum Statistical Unit in China based on GIS," Proceedings of 2017 the 7th International Workshop on Computer Science and Engineering, pp. 376-383, Beijing, 25-27 June, 2017.