Exploring the Variation Trend of Urban Expansion, Land Surface Temperature, and Ecological Quality and Their Interrelationships in Guangzhou, China, from 1987 to 2019

This study explored the model of urban impervious surface (IS) density, land temperature (LST), and comprehensive ecological evaluation index (CEEI) from centers to suburbs. The interrelationships between these parameters in Guangzhou 1987 2019 were analyzed using time-series Landsat-5 TM (Thematic Mapper), Landsat-8 OLI (Operational Land Imager), TIRS (Thermal Infrared Sensor) images. IS densities calculated concentric rings fractions, which used construct an inverse S-shaped density function depict changes form spatio-temporal dynamics expansion center results indicated that experienced expansive growth, with patterns spatial structure changing a single-center multi-center over past 32 years. Next, normalized LST CEEI each ring calculated, their variation trends suburbs modeled linear nonlinear functions, respectively. showed had gradual decreasing trend suburbs, while significant increasing trend. During 32-year rapid development, difference increased gradually time, significantly decreased. urbanization expanded areas Guangzhou, leading increase deterioration quality. Finally, potential among LST, also different models. revealed has produced geographical convergence several ISs, may risk heat island effect degradation