Location: Hydrology and Remote Sensing Laboratory
Title: Monitoring NEON terrestrial sites phenology with daily MODIS BRDF/albedo product and landsat data Authors
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: September 20, 2012
Publication Date: February 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. 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.