珠江三角洲土地覆盖变化对地表温度的影响

由于经济的快速增长,1978年以来的25年中,珠江三角洲地区的土地覆盖变化,特别是城市扩展速度非常之快。通过把遥感和地理信息系统相结合,研究了土地覆盖变化及城市增长状况,并且评估了城市增长对地表温度的影响。利用陆地卫星多时段数据监测了土地利用和土地覆盖变化;通过陆地卫星热红外单波段反演了地表温度,研究了土地覆盖变化特别是城市增长对地表温度的影响。结果发现,珠江三角洲地区土地覆盖变化明显,城市增长显著且不平衡。城市的发展使城市化地区的地表温度提高了8.9K。研究表明,遥感和地理信息系统的结合,在监测和分析土地覆盖变化,特别是城市增长状况以及评估城市化对地表温度的影响方面,是十分有效的。

Influence of Land Cover Change on Land Surface Temperature in Zhujiang Delta

The Zhujiang Delta has experienced a rapid land cover change, especially urbanexpansion over the past 25 years due to accelerated economic growth. This paper reports aninvestigation into the application of the integration of remote sensing and geographicinformation systems (GIS) for detecting land cover change and urban growth, and assessingtheir impact on land surface temperature in the region. Remote sensing techniques were usedto carry out land use/cover change detection by using multitemporal Landsat TM/ETM data,and retrieve out the land surface temperature by using single Landsat TM/ETM 6 thermalinfrared data. The integration of remote sensing and GIS was further applied to examine theimpact of land cover change and urban growth on land surface temperatures. The resultsrevealed a notable and uneven urban growth in the study area. This urban development hasraised land surface radiant temperature by 8.9K in the urbanized area. The integration ofremote sensing and GIS was found to be effective in monitoring and analyzing urban growthpatterns, and in evaluating urbanization impact on land surface temperature.