4. Results analysis
In order to demonstrate that STARFM algorithm was applicative to the NDVI series fusion, a square region containing approximately 200 × 200 pixels was randomly selected to compare the predicted NDVI on Julian data 241 of 2005 with actual acquired Landsat ETM+NDVI data on Julian date 246 of 2005 (Figs. 4 and 5). The general spatial distribution of predicted NDVI was consistent with the corresponding period of Landsat ETM+ NDVI, and the difference value between these two NDVI data were mainly distributed around zero