Evaluation Of Wuhan Ecological Environment Based On Remote Sensing Ecological Index And Information Entropy

The urbanization rate is an important indicator of the comprehensive strength of a country or region.With the continuous advancement of urbanization,urban ecological and environmental problems such as air pollution,water pollution,vegetation destruction and soil pollution are severe,which directly affects the quality of life of urban residents.And physical and mental health.Eco-environmental quality is an important indicator to measure the city’s livability level.Urban eco-environmental quality evaluation has important practical significance for promoting the harmonious development of regional economy and ecological environment,and dynamic monitoring of urban ecological environment.In order to explore the spatio-temporal evolution characteristics of the ecological environment quality in Wuhan,and to reveal the impact of land use changes on the ecological environment quality,this paper uses GIS and RS technology,with Wuhan as the research area,based on the RSEI model to analyze 2005-2015 The characteristics of the evolution of the spatiotemporal pattern of ecological environment quality in Wuhan during the year.On this basis,the land use change in Wuhan during the study period was analyzed,the contribution degree of different land use types to the ecological environment quality was quantified by the land use contribution LCI index,and a city ecological environment quality evaluation system based on GIS was constructed.The main content and work of this article are as follows:(1)Extracted four ecologically closely related evaluation indicators of greenness,wetness,dryness and heat in Wuhan.then,based on the theory of information entropy,an improved remote sensing ecological index evaluation model is proposed and constructed,which solves the problem of some information loss in traditional methods.(2)The characteristics of the spatial-temporal evolution of the ecological environment quality in Wuhan are discussed.The results show that the quality of the eco-environment in the study area has been declining from 2005 to 2015,but the deterioration has been well suppressed.The general ecological environment grade and above accounted for 86.07%,82.466%,and 79.709% of the total area respectively,indicating that the overall quality of Wuhan ’s ecological environment during the study period was good.The eco-environmental quality of Wuhan has a distribution characteristic that the northern part is superior to the southern part,and the central urban area is superior to the distant urban area.(3)The LCI index is proposed and constructed,and the quantitative relationship between land use change and ecological environment quality is discussed.From 2005 to 2015,the LCI index of forest land,cultivated land,and water bodies were all greater than 0,indicating that these three types of land use are beneficial to improve the urban ecological environment.The LCI index of construction land and unused land is less than 0,indicating that these two types of land use types have aggravated the urban ecological environment quality problems.(4)Based on the remote sensing ecological index model,combined with the information entropy method and geographic information system theory,using Arc GIS Engine and C # language,the urban ecological environment evaluation system was developed and constructed,which realized information management query,index extraction,ecological environment evaluation,data analysis and special topics Graphics and other functions.It provides an information platform for decision support for urban ecological environment evaluation and governance.