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干旱区地理 ›› 2014, Vol. 37 ›› Issue (1): 125-133.

• 地球信息科学 • 上一篇    下一篇

基于MODIS数据的石羊河流域地表温度空间分布

屈创,马金辉,夏燕秋,田菲   

  1. (兰州大学资源环境学院, 甘肃    兰州    730000)
  • 收稿日期:2013-06-19 修回日期:2013-08-25 出版日期:2014-01-25
  • 通讯作者: 马金辉(1964-),男,副教授,博士,研究方向为地理信息系统空间分析和西部地理环境空间建模. Email:majh@lzu.edu.cn
  • 作者简介:屈创(1988-),男,兰州大学硕士研究生,专业为地图学与地理信息系统,主要研究方向是GIS空间分析与环境建模.Email:roonymac@126.com
  • 基金资助:

    国家自然科学基金项目:石羊河流域生态承载力时空变化及驱动力研究(41171154)资助

Spatial distribution of land surface temperature retrieved from MODIS data in Shiyang River Basin

QU  Chuang,MA Jin-hui,XIA Yan-qiu,TIAN Fei   

  1. (College of Earth and Environmental Sciences, Lanzhou University, Lanzhou  730000, Gansu, China)
  • Received:2013-06-19 Revised:2013-08-25 Online:2014-01-25

摘要: 地表温度是生态系统中极其重要的环境因子,中小尺度区域的热场空间分布对生态系统稳定性的研究以及干旱区流域的农业生产建设具有重要意义。利用MODIS数据,采用劈窗算法反演石羊河流域的陆地表面温度(LST),并计算植被指数(NDVI);利用TM影像,通过目视解译获得研究区的土地利用数据,结合DEM数据,采用GIS空间分析方法,分析LST的空间分布特征和LSTNDVI在不同土地利用类型之间的差异以及二者之间的定量关系。结果表明:研究区陆地表面温度北高南低,东高西低,整体上表现为由东北向西南逐渐降低的趋势;地表温度与海拔呈负线性相关,相关系数为-0.928;不同土地利用类型的地表温度存在差异,地表温度最高的未利用土地要比最低的林地高出16.42 K;对于单一土地利用类型,耕地、林地、草地、建设用地的地表温度与NDVI具有明显负相关;对于整个研究区土地利用空间结构,地表温度与[NDVI]表现为LST-NDVI梯形关系,反映了流域地表温度和植被覆盖之间的关系,由此看出绿色植被对调节区域气候温度的重要性。

关键词: MODIS, 劈窗算法, LST, 土地覆盖

Abstract: Land surface temperature (LST) is a very important environmental factor to impact the energy and water exchange between the atmosphere and the ecosystem. The spatial distribution of LST in small and medium-scale region has a great significance on the stability of ecosystems and agricultural production and construction of the arid basins. In this study,the Shiyang River Basin in Gansu Province is chosen as the study area. It is a typically arid inland basin and its ecological environment is very fragile. The LST is retrieved from MODIS data by split-window algorithm,and the normalized difference vegetation index (NDVI) is calculated by its first band and second band. At the same time,the land use/cover is acquired from TM data by human-computer interactive interpretation. Combined with land use/cover and DEM data,the spatial distribution of LST is identified and the relation between NDVI and LST is analyzed in different land use types. The result shows as follows:(1)The LST in the north and the east is higher than that in   the south and the west of the study area,respectively. It performed the trend that the LST reduced gradually from the northeast to the southwest. (2)There is a negative correlation between LST and altitude,and the correlation coefficient is -0.928. Due to the differences in heat capacities,different land use/cover types,LST also has differences. The quantitative difference is 16.42 K between the highest LST of unused land and the lowest LST of forest land. (3)For single type of land use/cover,LST and [NDVI] have a significant negative correlation between cropland,forest land,grassland,and construction land. For the whole configuration of land use/cover in the study area,the relation between LST and NDVI displays ‘trapeziform’. The feature space of NDVI-LST contains a lot of geo-information,which reflects the relationship between the basin surface temperature and vegetation cover. And from the feature space of NDVI-LST,we can see that the green vegetation has a great importance on regulating the temperature of regional climate.

Key words: MODIS, split-window algorithm, LST, LUCC

中图分类号: 

  • TP79