The spatial scale research of MODIS LAI product autheticity verification

This paper proposes a new method of spatial scale conversion which is combining the MODIS product geometry information with the decomposition method basing on NDVI pixel. The method makes use of the LAI ground data, high-resolution images (TM) data and MODIS pixel geometry information, which make the 30m resolution image of TM-NDVI weight up to 1km by space response function, and then we can get the value of LAI inversion after pixel decomposition. The result of the scale conversion is compared with the MODIS LAI product to achieve the validation of the low resolution (MODIS) LAI product data. The experiment results show that the new method can be fully consider of the heterogeneity of the surface and pixel correspondence to the effect of results validation, which can effectively improve the accuracy of product certification, and is much better than existing space scale method.