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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. What is MODIS.

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modis land product subsets

MODIS Land Product Subsets

Suresh K. SanthanaVannan, 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

what is modis
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 : http://aqua.nasa.gov

modis is great but
MODIS is great! but ……..

Users (Field researchers) have some inconveniences :

slide5
Accessibility
  • Data Format
  • Processing Time
what ornl daac offers
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
slide7
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
modis subsets for selected sites
MODIS Subsets for Selected sites

Data Formats Offered

  • ASCII – 7x7 km subsets
  • GeoTIFF – 25x25 km subsets
slide13
1975

2001

slide14
1975

2001

2000

2008

modis subsetting web service
MODIS Subsetting Web Service

f(x)

SOAP

Client

Server

################# ORNL DAAC MODIS Web service - Perl client#################use SOAP::[email protected]= SOAP::Lite -> service(‘WSDL_URL') -> xmlschema('http://www.w3.org/2001/XMLSchema') -> getsubset(lat,lon,product,start_date,end_date,size);

MOD11A2.A2003001.h26v05.005.2007264203857.Clear_sky_days,MOD11A2,A2003001,Lat37.7Lon110Samp1Line1,2007264203857,Clear_sky_days,NA,0.000,2

MOD11A2.A2003001.h26v05.005.2007264203857.Clear_sky_nights,MOD11A2,A2003001,Lat37.7Lon110Samp1Line1,2007264203857,Clear_sky_nights,NA,0.000,254

…….

scope
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
questions
Questions?

Links

  • http://www.modis.ornl.gov/modis/index.cfm
  • http://daac.ornl.gov/MODIS/modis.html
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