Spatiotemporal Variation Analysis of Ecological Quality in Rizhao City over the Past 30 Years Based on GEE
TIAN Wenqin
HU Yanxiang
XU Min
WANG Dahai
GUO Mingxia
Abstract：Rizhao City is an important urban center in the eastern coastal region of China.Evaluating and monitoring its ecological quality is crucial for guiding ecological environment protection efforts.This study utilizes the GEE platform to construct a remote sensing ecological index(RSEI)using principal component analysis.The aim is to evaluate the spatiotemporal changes in ecological quality in Rizhao City from 1990 to 2020.The results show that:(1)The mean RSEI of Rizhao City in 1990 and 2020 were 0.569 and 0.597 respectively,indicating moderate overall ecological quality with significant spatial heterogeneity.Regions with poor and inferior ecological quality are mainly distributed in urban built-up areas,whereas regions with excellent and good grades are mainly in mountainous areas.(2)Over the period from 1990 to 2020,the proportions of areas with improved,stable,and degraded ecological quality were 30.93％,51.42％,and 17.65％,respectively,showing an overall improvement trend.Regions with improved and stable ecological quality are mainly distributed in ecological spaces such as Wulian Mountain area,Xiuzhen River basin,as well as agricultural spaces such as medicinal herb planting areas,and main grain-producing areas,whereas degraded areas are mainly in urban areas such as the central coastal area of Donggang and built-up zones in Juxian County.(3)From 1990 to 2020,the mean RSEI values in Lanshan,Juxian,and Wulian have increased,while those in Donggang have remained relatively stable.
Keywords：Google Earth Engine(GEE)ecological qualityremote sensing ecological indexRizhao city
Publication Date：2024-12-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 43-49 )