The Savitzky Golay (S-G) filter was used to smooth out noise in the time series MODIS NDVI data, specifically that caused primarily by cloud contamination and atmospheric variability.The algorithm made data approach the upper NDVI envelope and to reflect the NDVI pat-tern of change. It used a moving window, and noisy values were approximated by polynomial regression within the moving windows. An original NDVI profile and the S-G filtered NDVI profile at a randomly selected pixel was presented in Fig. 2. It was seen that S-G filter could effectively eliminate data noise and improve the quality of time series MODIS NDVI data. Projection of thesmoothed MODIS NDVI data was converted to the same projec-tion with Landsat ETM+ data. The spatial resolution of MODIS NDVI data was resampled to 30 m, and the same columns and lines were extracted to keep consist with Landsat ETM+ data for further analysis