Terra MODIS Collection 4 / 4.5 and Aqua MODIS Collection 4; Sinusoidal Projection Data from 2000 to present; 8-day, 16-day, or annual composites Sites.

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Presentation transcript:

Terra MODIS Collection 4 / 4.5 and Aqua MODIS Collection 4; Sinusoidal Projection Data from 2000 to present; 8-day, 16-day, or annual composites Sites chosen because of a willingness to share in situ site data (quid pro quo) Documentation provided for ASCII subsets and links to full documentation at MODIS Web sites Subsets of Remote Sensing Products for AmeriFlux Sites: MODIS ASCII Subsets AmeriFlux Annual Meeting: October 6, 2004, Boulder, Colorado R.B. Cook 1, S.M. Margle 1, S.K. Holladay 1, F.A. Heinsch 2, and C.B. Schaaf 3 1 Environmental Sciences Division, Oak Ridge National Laboratory*, Oak Ridge, Tennessee NTSG/College of Forestry and Conservation, University or Montana, Missoula, Montana Center for Remote Sensing, Boston University, Boston, Massachusetts ACKNOWLEDGEMENTS: This study was supported by the NASA’s Earth Observing System Data and Information System *Managed by the University of Tennessee-Battelle LLC under contract DE-AC05-00OR22725 with the U.S. Department of Energy Introduction We have prepared subsets of selected MODIS Land Products for the community to use for validation of models and remote sensing products and to characterize field sites. Visualization of MODIS ASCII Subsets: On-Line Tool Future Plans Continue to offer subsets of MODIS Land Products from Terra and Aqua Add Continuous Vegetation Field subsets Add Aqua products to the visualization tool Evaluate current sites and seek additional sites for future processing / reprocessing (e.g., Collection 5) To have your field site added to the MODIS ASCII Subset activity, we need geographic coordinates and commitment to share data Contact: Bob Cook MODIS Products Surface Reflectance Surface Temperature Land Cover NDVI / EVI LAI / fPAR Net Photosynthesis Annual NPP Albedo Reflectance – BRDF Adjusted Sites include flux tower sites, Baseline Surface Radiation Network (BSRN) sites, and sites participating in NASA’s validation program Processing ORNL DAAC receives subsetted data from MODIS processing stream subsets of selected products in HDF–EOS format and SIN Projection for 277 sites ORNL DAAC reformats from HDF-EOS image into ASCII file of values and QA flags for individual pixels Files expand as additional data are collected ASCII file posted on DAAC’s ftp site User selects sites and specific products from Web Map Server or picklist User Statistics: CY 2003CY 2004 (through August) Users Files Downloaded 15,67746,886 Background MODIS ASCII Subsets (7 x 7 km) 277 Sites Grids for single date for any MODIS Land Product Example is a 7 x 7 km grid of land cover for a user- selected site and date (composite period) IGBP Classification shown, other classifications available Sites selected from picklist or Web Map Server User selects dates of interest (8- or 16-day compositing period) MODIS Land Cover Product Time-series graphs of 8- and 16-day products from 2000 to present for a site Example is net photosynthesis and gross primary production Green bars are percentage of pixels that meet quality criteria, blue dots are acceptable values for individual pixels and red dots are the average of acceptable values MODIS GPP Product ASCII File of LAI/fPAR for Walker Branch