*2.3. GLOBMAP LAI*

The GLOBMAP LAI was generated as a consistent long-term global LAI product version 1 (1981–2011) by combining MODIS and historical AVHRR data, which can be downloaded from the website http://www.globalmapping.org/globalLAI/. MODIS series LAI data were derived from MODIS land surface reflectance and illumination and view angles data through a GLOBCARBON algorithm [31]. Then the relationship between AVHRR Simple Ratio (SR) and MODIS LAI was established pixel by pixel during the overlapped period 2000–2006. Following this the AVHRR LAI back to 1981 was estimated from AVHRR historical simple ratio index (SR) using these relationships [14]. The product is provided at 500 m spatial resolution and 8-day time step (2001–2011), and 16-day time step (1981–2000).
