The data set of the leaf area index offered here is a unique fusion of AVHRR and MODIS data. It covers the period 1981-2011. It has been obtained by fusing the GIMMS NDVI data set for 1981-2006, which is based on AVHRR data, which is described in Tucker et al. (2005, see references) and which was obtained from http://glcf.umd.edu/data/gimms/ , and several MODIS products from 2000-2011; these are the MODIS surface reflectance product (MOD09A1), the MODIS land cover product (MCD12Q1), and the MODIS leaf area index (LAI) product (MOD15A2) and were all obtained from https://lpdaac.usgs.gov/.
By using relationships between AVHRR observations and MODIS LAI obtained for the overlap period 2000-2006 the LAI was computed for the AVHRR time series from 1981-2006 with half monthly temporal resolution. Results of the overlap period were compared with each other and with field plot measurements (e.g. Liu et al., 2012, see references). The data set offered here comprises the LAI computed from AVHRR data for 1981-2000 and the MODIS LAI for 2000-2011.
The data set (version 01) has been downloaded on December 23, 2013, from http://www.globalmapping.org/globalLAI/ . The unit of the LAI data set is leaf area (in m²) per grid cell area (m²).
This data set was put into ICDC on January 16, 2014.