Remote sensing monitoring of impervious surface percentage in Hangzhou during 1990—2017
Yuting YANG1, Hailan CHEN2, Jiaqi ZUO2()
1. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China 2. Bazhong Bureau of Natural Resources and Planning,Bazhong 636000, China
The impervious surface percentage is an important indicator of regional urbanization and ecological environment changes. The spatial and temporal distribution of impervious surface percentage can reveal the current and future development potential of the city, and provide a reference for urban environmental protection and green sustainable development. In this paper, Hangzhou was selected as the study area, and one Sentinel-2B satellite image was used to extract the impervious surface percentage as reference data. Based on the four-phase Landsat satellite imagery, the authors used the random forest algorithm to invert the 30 m spatial resolution impervious surface percentage datasets from 1990 to 2017 in Hangzhou. The accuracy verification results show that the mean absolute error is from 6.3% to 6.7%, and the root mean square error is from 13.40% to 14.25%, indicating that the inversion model has great accuracy and can accurately reflect the spatial distribution of the impervious surface. Based on the impervious surface weighted mean center, standard deviation ellipse and landscape pattern index, the authors analyzed the spatial and temporal patterns of impervious surface in Hangzhou. The results are as follows: The impervious surface percentage in Hangzhou was increasing from 1990 to 2017, and the annual average growing of impervious surface percentage was the fastest from 2010 to 2017, mainly concentrated in Yuhang and Xiaoshan; Due to the unbalanced development of Hangzhou between 1990 and 2017, the impervious surface weighting mean centre moved to northeast at first, then moved to south, and finally moved to north; The northwest-southeast profile was the main direction of urban growth and the gathering trend was relatively stable in Hangzhou; The change of landscape pattern shows that the impervious landscapes of all types were increasing, and were distributed in a balanced trend; The natural surface, medium density and super high density impervious landscapes became less aggregated and increasingly fragmented; The aggregation of the impervious landscapes of all types was relatively stable, the highest degree of aggregation was the natural surface, and the lowest was the medium density impervious landscape.
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2020, Vol. 32 
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