Dataset Open Access
Liu, Ronggao;
Liu, Yang;
Chen, Jingming
GLOBMAP LAI (Version 3) provides a consistent long-term global leaf area index (LAI) product (1981-2020, continuously updated) at 8km resolution on Geographic grid by quantitative fusion of Moderate Resolution Imaging Spectroradiometer (MODIS) and historical Advanced Very High Resolution Radiometer (AVHRR) data. The long-term LAI series was made up by combination of AVHRR LAI (1981–2000) and MODIS LAI (2001–). MODIS LAI series was generated from MODIS land surface reflectance data (MOD09A1 C6) based on the GLOBCARBON LAI algorithm (Deng et al., 2006). The relationships between AVHRR observations (GIMMS NDVI (Tucker et al., 2005)) and MODIS LAI were established pixel by pixel using two data series during overlapped period (2000–2006). Then the AVHRR LAI back to 1981 was estimated from historical AVHRR observations based on these pixel-level relationships. Detailed descriptions of algorithm and evaluation of the algorithm see Liu et al. (2012, JGR-B).
Several changes have been made compared with the JGR paper:
Dataset Characteristics:
Spatial Coverage: 180ºW~180ºE, 63ºS~90ºN;
Temporal Coverage: July, 1981-Dec. 2020 (continuously updated);
Spatial Resolution: 0.0727273º;
Temporal Resolution: Half month (1981-2000), 8-day (2001-);
Projection: Geographic;
Data Format: HDF/Geotiff;
Scale: 0.01;
Valid Range: 0-1000.
Citation (Please cite this paper whenever these data are used):
Liu, Y., R. Liu, and J. M. Chen (2012), Retrospective retrieval of long-term consistent global leaf area index (1981–2011) from combined AVHRR and MODIS data, J. Geophys. Res., 117, G04003, doi:10.1029/2012JG002084.
If you have any questions, please contact Prof. Ronggao Liu (liurg@igsnrr.ac.cn) or Dr. Yang Liu (liuyang@igsnrr.ac.cn).
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1981-1990_HDF.rar
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Liu, Y., R. Liu, and J. M. Chen (2012), Retrospective retrieval of long-term consistent global leaf area index (1981–2011) from combined AVHRR and MODIS data, J. Geophys. Res., 117, G04003, doi:10.1029/2012JG002084.
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