I. Introduction

The urban thermal environment of a city is an integrate representation for spatial environment in thermal field. Different thermal environment patterns have deeply effect on microclimate, urban ecology, and human environment and so on. In recent years, the development of remote sensing provides a probability for researching the thermal environment pattern and process in a city, and some researchers have already documented those [1]. Because of the complicacy, dynamic properties and invisibility in thermal environment, it is difficult to research the thermal environment pattern and process.