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利用5对同日过境的HJ-1A/B CCD和Landsat TM/ETM+影像对,研究了二者植被指数(NDVI、SAVI、EVI)之间的定量关系。选用其中的3对影像对作为实验影像,通过对均匀同质实验区对应的植被指数进行回归分析求出二者之间的转换方程,用未参与实验的2对影像对来验证所求转换方程的有效性,并对二者植被指数之间的差异进行了分析。结果表明:两种传感器对应的植被指数之间存在极显著的线性正相关关系,所求的转换方程具有较高的精度,可以利用转换方程将两种传感器的植被指数进行互为转换,有利于二者植被监测结果的互为补充,而两种传感器在光谱响应函数上的不同造成了二者植被指数间存在差异。
Five pairs of HJ-1A / B CCD and Landsat TM / ETM + image pairs were used to study the quantitative relationship between the two vegetation indices (NDVI, SAVI, EVI). Three pairs of image pairs were chosen as experimental images. The regression equations were obtained by regression analysis of the corresponding vegetation indices in the homogeneous homogeneous experimental area. Two pairs of image pairs that did not participate in the experiment were used to verify the conversion equation The effectiveness of the two vegetation indices was analyzed. The results show that there is a significant linear positive correlation between the vegetation indices corresponding to the two sensors, the conversion equation obtained is of high precision, and the conversion equations can be used to convert the vegetation indices of the two sensors to each other, which is in favor of The two vegetation monitoring results complement each other, and the two sensors in the spectral response function caused by the difference between the two vegetation index differences.