Comparative analysis in retrieved FPAR from HJ1CCD and Landsat8OLI Data in Hulunber grassland

FPAR(Fraction of Absorbed Photosynthetically Active Radiation) is one of the main plant physiological parameters. FPAR estimation models were established based on both ground measured data and NDVI extracted from HJ-1CCD (Chargecoupled Device, CCD) and Landsat8OLI (Operational Land Imager, OLI) image, respectively. And then, the differences in retrieved FPAR from CCD and OLI data were comparatively analyzed and quantitatively assessed. There was a outstanding positive correlation between measured FPAR and NDVI from CCD and OLI data. For each ESU(Elementary Sampling Units), FPAR retrieved from CCD and OLI data were significantly consistent with each other only with small difference. FPAR retrieved from CCD data was consistent with that retrieved from OLI data with similar distribution trends and small difference if excluded the area being affected by clouds and cloud shadow in the entire study area. The results provided reference and guidance for further FPAR research in the studied area.