A Data Access and Comparison Tool for Biogeochemical Data from Diverse Sources

1
A Data Access and Comparison Tool for
Biogeochemical Data from Diverse Sources Jerry
Pan1, Robert B. Cook1, Suresh K. Santhana
Vannan1, Bruce E. Wilson1 , Bai Yang1, Ana
Pinheiro2, Glenn Rutledge2, Steve Anthony2, Dan
Swank2, Danny Brinegar2, Jeff Privette2 1ORNL
DAAC, Environmental Sciences Division, Oak Ridge
National Laboratory, Oak Ridge, Tennessee
37831-6407 2National 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. NASAs 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).

• 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

Architecture
Web Services - MODIS - CRN Data
Other Data Services (e.g., OGC)
OPeNDAP Servers - RUC - GOES -
AmeriFlux
Web Services - MODIS - CRN
RDBMS
other
dap
soap
Select Bondville, Illinois Site from Ameriflux
Network
Internet Internet
MODIS / Ameriflux NDVI And MODIS LAI, EVI Time
Series
Local File System
Data Calls

• 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

Data Integration Analysis
Presentation service
Application Server
DAP Data Access Protocol SOAP Simple Object
Access Protocol
Graphical User Interface
Pilot Web Version URL (Web 2.0 GUI)
http//daacds.ornl.gov8080/spec Pilot Desktop
Version URL (Java WebStart) http//daacdap-dev.orn
l.gov/spec.html
Products for Comparison Different Spatial,
Temporal, and Measured Representations of
Temperature

• 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

MODIS GOES RUC NCEP Forecast CRN AmeriFlux
Source ORNL DAAC MODIS Subsetting Tool NOAA CLASS NOAA ESRL (_at_ORNL) NCDC CRN AmeriFlux
Format HDF-EOS GVAR / netCDF netCDF ASCII netCDF
Projection Sinusoidal Swath Lat/Lon -- --
Spatial Resolution 1 km ½ 1/8 degrees 1 deg. or 12 km Point Point
Temporal Resolution 8-day averages ½ hourly Hourly Hourly ½ hourly
QA level High Low -- High High
Subsetting Fixed / Variable None Variable -- --
Sensor IR Sensor IR Sensor Model Output IR Sensor Thermistor
Climate Reference Network

• Climate Reference Networkhighest quality NOAA
  climate data , including air and surface
  temperature, rainfall, and radiation
• 114 stations when fully implemented (2008)
  currently 106 installed

MODIS / Ameriflux Temperature Time Series
Example Output of LST Time Series
Howland Forest, Maine, USA
Summary

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

• 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

Bondville, IL CRN Site Mown lawn
ACKNOWLEDGEMENTS This study was supported by the
NASAs 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.
Contacts Jerry Pan (pany_at_ornl.gov) or Bob Cook
(cookrb_at_ornl.gov)