HJ NDVI cross-calibration for grassland in Northern China

Abstract

Abstract: The time series are being widely used. The Chinese HJ satellites which loaded 4 CCD sensors are capable of providing high spatial and temporal resolution observation data, which can establish the NDVI time series for environmental monitoring, disaster control and resources investigation, provide great opportunities for researches around China and its neighbouring areas. However, the band differences between sensors can significantly affect the NDVI accuracy. This paper based on band analysis of the 4 HJ CCD sensors and LandSat TM, ETM+, using simultaneous image pairs, obtained the NDVI cross-calibration factors for the 6 sensors of mid-temperate arid and semi-arid grassland in northern China. By verification with equivalent NDVI from our field investigation in Hulunbuir, the result shows that the difference between sensors can reach up to 5%, which can effectively be reduced to 2% by applying the cross-calibration factor. Meanwhile, we proved the influence of NDVI from the center wavelength is much more than the band width.

CLC Number:

S812-05
S127

LIU Rui, SUN Jiu-lin, ZHANG Jin-qu, WANG Juan-le, LIAO Xiu-ying. HJ NDVI cross-calibration for grassland in Northern China[J]. Acta Prataculturae Sinica, 2011, 20(1): 189-198.

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