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ORNL DAAC MODIS Land Product Subsets


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MODIS (Moderate Resolution Imaging Spectroradiometer) sensor data are highly useful for field research. However, the volume of MODIS data and the complexity in data format makes MODIS data less usable for some communities. To expand the use of MODIS data beyond traditional remote sensing specialists, the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC) prepares and distributes subsets of selected Land Products in a scale and format useful for undergraduate students and field researchers. MODIS subsets are provided for more than 1,000 sites across the globe. The subsets are offered in tabular ASCII format and in GIS compatible GeoTIFF format. Time series plots and grid visualizations to help characterize field sites are also provided. In addition to offering subsets for fixed sites, the ORNL DAAC also offers the capability to create user-defined subsets for any location worldwide. The MODIS Global subsetting tool provides subsets from a single pixel up to 201 x 201 km for user-defined time range. Statistics, time series plots and GIS compatible files for the customized subsets are also distributed through this tool. Users can also programmatically retrieve the subsets through a SOAP based Web Service.

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ORNL DAAC MODIS Land Product Subsets

  1. 1. MODIS Land Product Subsets Suresh K. Santhana Vannan, Robert B. Cook, Bruce E. Wilson, Lisa M. Olsen HDF and HDF-EOS Workshop XII October 15 – October 17, 2008 ORNL DAAC Oak Ridge National Laboratory Distributed Active Archive Center Oak Ridge, Tennessee, USA
  2. 2. What is MODIS  MODerate Resolution Imaging Spectroradiometer  Hyper-Spectral sensor onboard two satellites (Terra and Aqua)  Terra MODIS and Aqua MODIS are viewing the entire Earth's surface every 1 to 2 days, acquiring data in 36 spectral bands, or groups of wavelengths  Data stored in HDF-EOS gridded file format Source :
  3. 3. MODIS is great! but …….. Users (Field researchers) have some inconveniences :
  4. 4. Volume
  5. 5. Accessibility Data Format Processing Time
  6. 6. What ORNL-DAAC offers? User community requested that we prepare MODIS Land Products in an easy-to-use format and size   To validate remote sensing products To characterize field sites
  7. 7. Tools Used • hdp dumpsds from The HDF group • Customized for our need • MODIS Reprojection tool from LPDAAC • GDAL (Geospatial Data Abstraction Library) • Minnesota Map server • Custom Perl code
  8. 8. MODIS Subsets for Selected sites MODIS Products offered at ORNL-DAAC Data Formats Offered   ASCII – 7x7 km subsets GeoTIFF – 25x25 km subsets Surface Reflectance Surface Temperature Land Cover Vegetation Phenology NDVI / EVI LAI / fPAR Net Photosynthesis Annual NPP Albedo (calc) Reflectance – BRDF Adjusted
  9. 9. Subsetting and Visualization Tool for Any location on Globe Demo:
  10. 10. Case Study: Deforestation in Amazon
  11. 11. 1975 2001
  12. 12. 1975 2001 2000 2008
  13. 13. Dec 31 2010
  14. 14. Jan 1 2011
  15. 15. MODIS Subsetting Web Service f(x) Client ################ # ORNL DAAC MODIS Web service - Perl client ################# use SOAP::Lite @params= SOAP::Lite -> service(‘WSDL_URL') -> xmlschema('') -> getsubset(lat,lon,product,start_date,end_date,size); SOAP SOAP Server MOD11A2.A2003001.h26v05.005.2007264203857.Clear_sky_ MOD11A2.A2003001.h26v05.005.2007264203857.Clear_sky_ days,MOD11A2,A2003001,Lat37.7Lon110Samp1Line1,200726 days,MOD11A2,A2003001,Lat37.7Lon110Samp1Line1,200726 4203857,Clear_sky_days,NA,0.000,2 4203857,Clear_sky_days,NA,0.000,2 MOD11A2.A2003001.h26v05.005.2007264203857.Clear_sky_ MOD11A2.A2003001.h26v05.005.2007264203857.Clear_sky_ nights,MOD11A2,A2003001,Lat37.7Lon110Samp1Line1,20072 nights,MOD11A2,A2003001,Lat37.7Lon110Samp1Line1,20072 64203857,Clear_sky_nights,NA,0.000,254 64203857,Clear_sky_nights,NA,0.000,254 ……. …….
  16. 16. Scope       Tool for scientific research (Environmental Impact assessment, carbon budgeting, etc.) Classroom education and projects for students Time series, trend analysis GIS overlay analysis Statistical analysis (Across many years and across different land cover types) Validation of MODIS products and other remote sensing products
  17. 17. Questions? Links  