Ecological environment assessment based on Remote Sensing in Zhengzhou

Abstract

In this paper, the ecological environmental quality of Zhengzhou city was evaluated and analysed by images of Landsat series of 1997, 2006 and 2014 based on the weights by using principal component analysis to determine the green degree, humidity, dryness and heat of the 4 indicators, using remote sensing ecological index (RSEI) evaluation model. The results showed that in 1997-2014, the ecological environment quality in Zhengzhou city was generally decreased, and the mean RSEI decreased from 0.553 to 0.401; the improving the ecological environment of the region was mainly distributed in the surrounding Zhengzhou City, accounted for only 23.86% of the total area; ecological and environmental deterioration in the region was mainly distributed around the built-up area in the city of Zhengzhou, accounting for 52.10% of the total area. The quality of the ecological environment in the study area was greatly affected by urban expansion, and its ecological environment quality was on the downward trend. The city’s ecological environment needed to be further strengthened.