AVHRR NDVI和MODIS NDVI一致性评估

Agreement Evaluation of the NDVI Derived from AVHRR and MODIS

以AVHRR传感器和MODIS传感器为研究对象,以冠层辐射传输模型模拟植被多种状况下的冠层反射率为基础,得到对应于AVHRR和MODIS红光和近红外波段的反射率,计算并比较这两种传感器提取的NDVI结果。研究表明,这种方法从新的角度评估了AVHRR NDVI和MODIS NDVI产品之间的一致性,并提供了对应的校正系数。

This paper performed a comparing study of NDVI record acquired from the Advanced Very High Resolution Radiometer(AVHRR) which record the longest NDVI data and the Moderater Resolution Imaging Spectroradiometer(MODIS) which designed as the successors to the AVHRR. The comparing study focused on the inl uence caused by the sensors dif erent design, and based on radiative transfer model to acquire rel ectance in dif erent vegetation status for simulation the rel ectace of AVHRR and MODIS in red and NIR bands and to calculate and calibrate NDVI. The results show that the method explains the dif erence between AVHRR NDVI and MODIS NDVI in new way and provides calibration coefficients. This study offers scientific reference and thinking for the continuity issue between AVHRR NDVI and MODIS NDVI.