Abstract
ABSTRACTTwo approaches could be utilized to derive the vegetation health indices from recently launched Visible Infrared Imaging Radiometer Suite (VIIRS) sensor with the goal to maintain the consistency with the long-term Advanced Very High Resolution Radiometer (AVHRR) vegetation health products. One approach is to convert VIIRS Normalized Difference Vegetation Index (NDVI)/brightness temperature (BT) to AVHRR, as the first version. The other is to derive long-term pixel-based VIIRS climatology without converting at NDVI/BT level. The second version of products, derived from the new VIIRS pseudo long-term climatology as presented in this article, can trace the signature of the long-term AVHRR vegetation health products quite well, in terms of histogram, correlation coefficients, time series, and so on. The extended products with higher resolutions also perform as expected, indicating that the constructed long-term high-resolution climatology is reasonable. The third version of the products, based on VIIRS real long-term climatology, still needs many years to develop.
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