The linear and non-linear relationships between land surface broadband emissivity (BBE) and MODIS seven narrowband albedos and AVHRR channel 1 & 2 reflectances are established individually. The relationships are then used to estimate global land surface 8-day, 1 and 5 km BBE from 1981 through 2010.

The 1 km BBE product was generated from pre-processed MODIS standard reflectance and albedo product (MOD09A1 and MCD43B3). The 500 m MOD09A1 was composited into 1 km to match the spatial resolution of MCD43B3. The 5 km BBE product was generated from 8-day AVHRR reflectance data, which was composited from daily AVHRR reflectance product (LTDR, V3, AVH09). The pre-process includes cloud clearing, spatiotemporal filtering, and gap filling.

For further details please consult publications:

Cheng, J., S. Liang, Y. Yao, X. zhang (2013). "Estimating the Optimal Broadband Emissivity Spectral Range for Calculating Surface Longwave Net Radiation." IEEE Geoscience and Remote Sensing Letters 10(2): 401-405.
Ren, H., S. Liang, G. Yan, J. Cheng (2013). "Empirical algorithms to map global broadband emissivities over vegetated surfaces." IEEE Transactions on Geoscience and Remote Sensing: doi:10.1109/TGRS.2012.2216887.
Cheng, J. and S. Liang (2013). "Estimating global land surface broadband thermal-infrared emissivity from the Advanced Very High Resolution Radiometer optical data." International Journal of Digital Earth: Accepted.

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