Title :
A long-term global Leaf area index dataset (1981–2009) from AVHRR and MODIS data
Author :
Liu, Yang ; Liu, Ronggao
Author_Institution :
Inst. of Geographic Sci. & Natural Resources Res., Beijing, China
Abstract :
A global multi-decade long-term Leaf area index (LAI) record from remote sensing measurements is required for global change modeling and analysis. The dataset is generated through the fusion of MODIS and historical AVHRR data based on global pixel-based AVHRR SR MODIS LAI relationship which is established with AVHRR data and LAI derived form high quality MODIS observations in the overlapping years from 2000 to 2006. Based on this relationship, historical AVHRR retrieval from 1981 to 2006 is constrained with high quality MODIS observations. The comparisons of the results from 2000 to 2006 show high consistency between the derived AVHRR and MODIS LAI dataset. The derived AVHRR and MODIS LAI were directly validated with 120 field measurements in global 36 sites with various vegetation types, with RMSE of 0.91 and 1.01, respectively.
Keywords :
radiometry; sensor fusion; time series; vegetation; vegetation mapping; AD 1981 to 2009; AVHRR data; MODIS data; MODIS observation; data fusion; data retrieval; global change analysis; global change modeling; global multidecade long-term leaf area index record; global pixel-based AVHRR SR MODIS LAI relationship; long-term global leaf area index dataset; remote sensing measurement; vegetation type; Atmospheric measurements; Atmospheric modeling; Indexes; MODIS; Reflectivity; Remote sensing; Sensors; AVHRR; Leaf area index; MODIS; long-term time series;
Conference_Titel :
Geoscience and Remote Sensing Symposium (IGARSS), 2011 IEEE International
Conference_Location :
Vancouver, BC
Print_ISBN :
978-1-4577-1003-2
DOI :
10.1109/IGARSS.2011.6049247
