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Title:   Author  item
                                            WANG, ZHUOSEN - University Of Massachusettsitem
                                            SCHAAF, CRYSTAL - University Of Massachusettsitem
                                            STRAHLER, ALAN - Boston Universityitem
                                            Gao, Fengitem
                                            ZHANG, XIOYANG - National Oceanic & Atmospheric Administration (NOAA)item
                                            YANG, XIAOYUAN - University Of Massachusettsitem
                                            SHUAI, YANMIN - National Aeronautics And Space Administration (NASA)item
                                            KIM, JIHYUN - Boston Universityitem
                                            MORISETTE, JEFF - Us Geological Survey (USGS)item
                                            MEIER, COURTNEY - Collaborator
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 9/20/2012
                                    Publication  Date: 2/7/2013
                                    Citation: Wang, Z., Schaaf, C., Strahler, A., Gao, F.N., Zhang, X., Yang, X., Shuai, Y., Kim, J., Morisette, J., Meier, C. 2013. Monitoring NEON terrestrial sites phenology with daily MODIS BRDF/albedo product and landsat data[abstract]. 4th North American Carbon Program All-Investigators Meeting. 2013 CDROM.Interpretive Summary:
                                Technical Abstract: The MODerate resolution Imaging Spectroradiometer (MODIS) Bidirectional Reflectance Distribution Function (BRDF) and albedo products (MCD43) have already been in production for more than a decade. The standard product makes use of a linear “kernel-driven” RossThick-LiSparse Reciprocal (RTLSR) BRDF model to describe the reflectance anisotropy of each pixel at a 500-m gridded resolution. The MODIS BRDF/albedo daily version of the product emphasizes the daily observation in an attempt to capture rapidly changing surface conditions. Individual observations are weighted by their quality, observation coverage, and proximity to the production date of interest. Vegetation phenology is a key indicator of the biological effects of climate change. The accurate monitoring of phenology is required to understand the variability in terrestrial ecosystem carbon exchange. The National Ecological Observatory Network (NEON) is a continental-scale ecological observatory with each site representing different ecosystem regions with varying vegetation type and climate. The NEON effort will provide site-based field measurements, coupled with regional and national-scale airborne remote sensing observations, to describe land use change and climate change in these ecosystems. The long-term acquisition of these data is crucial in efforts to improve ecological forecast models. In this study, we monitor the phenology dynamics over the NEON terrestrial sites by using vegetation indices derived from the daily MODIS Nadir BRDF-Adjusted Reflectance (NBAR) data of MODIS BRDF/albedo product and enhance the evaluation with 30 m spatial resolution Landsat to capture more spatial details.


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