1. A Data Access and Comparison Tool for Biogeochemical Data from Diverse Sources Jerry Pan 1, Robert B. Cook 1, Suresh K. Santhana Vannan 1, Bruce E. Wilson 1, Bai Yang 1, Ana Pinheiro 2, Glenn Rutledge 2, Steve Anthony 2, Dan Swank 2, Danny Brinegar 2, Jeff Privette 2 1 ORNL DAAC, Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6407 2 National Climatic Data Center, NOAA, Asheville, NC 28801-5001 2008 NASA Carbon Cycle and Ecosystems Joint Science Workshop, April 28-May 2, 2008 Introduction Satellite imagery provides a means of extending our understanding of land surface properties from site-specific studies to larger regions. In addition, site-based information can serve to validate remote sensing products. However, acquiring, preparing, and analyzing the time-series of remote sensing products along with site-based data can be computationally challenging. NASA’s ORNL DAAC and NCDC collaborated to develop a pilot tool that allows ready access of land surface data products from field observations, model output, and remote sensing records for field stations in North America. The tool is designed to access the diverse data products from distributed sources, using standard-based data exchange protocols such as OPeNDAP (DAP) and W3C Web Service (SOAP). ACKNOWLEDGEMENTS: This study was supported by the NASA’s Earth Observing System Data and Information System. ORNL is managed by the University of Tennessee-Battelle LLC under contract DE-AC05-00OR22725 with the U.S. Department of Energy. Web Tool Features and Example Screenshots Multiple biophysical parameters (LST, NDVI, LAI, EVI), and will include Albedo, NPP etc. Easy Site search and selection, Google Map preview, links to site network web pages Easy steps to choose site, variable, data source, and time period of interest Real-time time series visualization Data subset downloadable in CSV format Facilitate the simultaneous access and intercomparison of in situ, satellite, and modeling data Acquire spatial / temporal subsets of the data Help evaluate and validate satellite products and in-situ science research Currently seeking feedback and input on tool Products for Comparison: Different Spatial, Temporal, and Measured Representations of Temperature Summary Howland Forest, Maine, USA Capabilities  Current Capabilities Currently supported variables include Land Surface Temperature (LST), Normalized Difference Vegetation Index (NDVI), Leaf Area Index (LAI), Enhanced Vegetation Index (EVI). Of these, LST and NDVI data are from both site-based and satellite-based products, while LAI and EVI are from satellite-based products Point-based site selection, covering more than 120 field locations from various research/operation networks Obtain subsets (location, time span) from multiple data source Time series visualization/comparison Download specified time series in ASCII format  Future Development Efforts: Support other biogeochemical properties: Reflectance, Albedo, Radiation, NPP, etc. Areal-based data visualization/comparison, aggregation / analysis tools, in collaboration with users/science team Expand to other sensors (e.g., MISR) and other monitoring networks Capability Example: Land Surface Temperature Quantitatively compare land surface temperature (LST) data from MODIS (Terra and Aqua), GOES (East and West), Climate Reference Network (CRN), AmeriFlux sites, and Rapid Update Cycle (NCEP) Model Forecast for 2006, centered on the following CRN stations: –Bondville –Ft. Peck –Barrow –Audubon Research Ranch –Canan Valley Data obtained on-demand through data access protocols and Web services from various Web Sites, and processed by Java Desktop Application MODISGOESRUC NCEP Forecast CRNAmeriFlux SourceORNL DAAC MODIS Subsetting Tool NOAA CLASSNOAA ESRL (@ORNL) NCDC CRNAmeriFlux FormatHDF-EOSGVAR / netCDF netCDFASCIInetCDF ProjectionSinusoidalSwathLat/Lon-- Spatial Resolution1 km½ & 1/8 degrees 1 deg. or 12 kmPoint Temporal Resolution8-day averages½ hourlyHourly ½ hourly QA levelHighLow--High SubsettingFixed / VariableNoneVariable-- SensorIR Sensor Model OutputIR SensorThermistor Bondville, IL AmeriFlux Site Cropland Bondville, IL CRN Site Mown lawn Climate Reference Network Climate Reference Network—highest quality NOAA climate data, including air and surface temperature, rainfall, and radiation 114 stations when fully implemented (2008); currently 106 installed Architecture Example Output of LST Time Series 1.User selects temperature from multiple sensors for a site 2.User selected period in 2006 (temporal subsetting) 3.Time series visualization, with Zoom-in Tool Pilot Web Version URL (Web 2.0 GUI): http://daacds.ornl.gov:8080/spechttp://daacds.ornl.gov:8080/spec Pilot Desktop Version URL (Java WebStart) http://daacdap-dev.ornl.gov/spec.htmlhttp://daacdap-dev.ornl.gov/spec.html Contacts: Jerry Pan (pany@ornl.gov) or Bob Cook (cookrb@ornl.gov)pany@ornl.gov Web Services - MODIS - CRN Data Other Data Services (e.g., OGC) Local File System Graphical User Interface RDBMS Application Server Data Integration & Analysis Presentation service Data Calls OPeNDAP Servers - RUC - GOES - AmeriFlux DAP: Data Access Protocol SOAP: Simple Object Access Protocol Web Services - MODIS - CRN soap dap other Internet Select Bondville, Illinois Site from Ameriflux Network MODIS / Ameriflux NDVI And MODIS LAI, EVI Time Series MODIS / Ameriflux Temperature Time Series