Li, YQ; Li, XJ; Lian, J; Wang, RH (2012). Temporal and Spatial Variation of Vegetation Coverage in Beijing-Tianjin-Hebei Metropolis Circle with MODIS Vegetation Indices Data Product. ADVANCED MATERIALS IN MICROWAVES AND OPTICS, 500, 123-129.
This paper describes the temporal and spatial variation of vegetation coverage in Beijing-Tianjin-Hebei Metropolis circle using 1km MODIS vegetation indices data product (MOD13A3), and the main satellite data used in this study were MODIS NDVI and EVI data, city borderline data and DEM. After processing data with ENVI software, the time- series maps of the NDVI and EVI were drawn by ArcMap software, and the curve charts were formed by Excel. By using the temperature, rainfall data and vegetation distribution data, the spatial and temporal variation of the VI was analyzed. The results shows that the MODIS VIs varies with season, and the curves of their monthly mean values are downwards opening quadratic parabolas, with the maximum appeared in June and July. The spatial distribution of MODIS vegetation indices is positively correlated with vegetation coverage, and appeared regional characteristics. The vegetation coverage of Beijing- Tianjin-Hebei Metropolis circle has obviously increased during the past years, due to the ecological project operated in the research region.