Analysis of built-up area range and ecological quality changes in the Erhai Basin based on Google Earth Engine

doi:10.14088/j.cnki.issn0439-8114.2024.02.030

Abstract

Abstract: Taking Erhai Basin as the research area, with the help of Google Earth Engine cloud platform and Landsat 8 OLI series images, the enhanced index-based build-up index （EIBI） of the research area was synthesized and the built-up areas in Erhai Basin was extracted. Then, the remote sensing-based ecological index of the study area was synthesized. Through the spatial correlation analysis of the remote sensing-based ecological index of the built-up area and the basin, the ecological assessment of Erhai Basin and its built-up area from 2014 to 2021 was carried out. The results showed that the EIBI could effectively enhance the building information. Using EIBI could effectively and accurately extract the built-up area of the study area. After EIBI extraction, the expansion area of the built-up area of Erhai Basin from 2014 to 2021 was 14.712 km². From 2014 to 2021, the ecology of Erhai Basin was significantly improved, the remote sensing ecological index increased by 0.008, with an increase rate of 0.001/year, and more than 65% of the regional ecology in the basin was improved. The built-up area in Erhai Basin roughly matched the area where the ecology had not been improved. The ecological quality of the built-up area had not been significantly improved after ecological restoration, and the ecological quality of the built-up area showed a downward trend year by year, indicating that the built-up area had resistance to environmental improvement.

Key words: Erhai Basin, enhanced index-based built-up index, remote sensing-based ecological index, Google Earth Engine, basin environment

CLC Number:

P237
X321

ZHENG Shu-yuan, CHEN Xing-yu, HAI Yan, WANG Jian-xiong. Analysis of built-up area range and ecological quality changes in the Erhai Basin based on Google Earth Engine[J]. HUBEI AGRICULTURAL SCIENCES, 2024, 63(2): 199-204.

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