基于光谱混合分析的城市植被覆盖度与地表温度关系的研究

Study of relationship between urban land vegetation coverage and land surface temperature based on linear spectral mixture analysis

分别选择NDVI和光谱混合分析植被组分(VF)作为城市植被覆盖度指示因子,研究植被覆盖度与地表温度(LST)的相关关系.选择了一定数量的样本点,通过线性拟合的方法研究了NDVI及VF与LST的相关关系.研究结果表明,VF与LST之间的相关性比NDVI与LST之间相关性更好.研究表明,在城市LST研究中VF可以作为表征植被性质的参数.

Urban vegetation is an important parameter in urban temperature and climate study.We used NDVI and VF（vegetation fraction） generated from spectral mixture analysis as urban vegetation cover indicator factors to study the relationship between vegetation cover and LST （land surface temperature）.We selected a number of typical samples and studied the relationships between LST and VF and between LST and NDVI based on the linear fitting method.The results indicated that the vegetation coverage decreased linearly as the temperature increased and the relationship between VF and LST was better than that between NDVI and LST.Our results show that VF can be used as vegetation character indicator in urban LST study.