Evaluation of Ecological Quality in Xiong’an New Area Based on RSEI Index

Ecological environment is the basis of a region's survival and development, and the monitoring of ecological quality in Xiong’an New Area will be an important content related to regional development. In this research, based on Landsat8/OLI images in 2013 and 2019, combined with humidity, dryness, heat, greenness and other indicators, through the spatial principal component analysis （PCA） method, the main information of the four indicators was concentrated on a small number of principal components, thus constructing RSEI comprehensive index. By means of remote sensing technology, the changes of ecological quality and reasons of this change before and after the establishment of Xiong’an New Area were analyzed from the perspective of space and time. In addition, the relationship between different land use types and the RSEI index were discussed quantitatively. The results showed that: （1） Greenness and humidity had positive effects on ecological quality, while dryness and heat were opposite, among which dryness had the greatest influence. （2） From 2013 to 2019, the overall ecological quality of Xiong’an New Area showed a downward trend. （3） According to the statistics of regional changes, the area with relatively great change degree of ecological quality was about 10% of the total area, which indicated that the change degree of the overall ecological quality was not high. （4） The values of RSEI index of different land use types showed aggregation distribution. Bare land and construction land were distributed in low-value area, while water and vegetation were distributed in high-value area. In summary, After the establishment of, the ecological quality of Xiong’an New Area has been declining in the past two years. In the future planning and construction, we should strengthen the protection of ecological environment and build a scientific and reasonable spatial layout to support the sustainable economic development of Xiong’an New Area and build a green and intelligent new city.