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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 :




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


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


Subsetting and visualization tool for any location on globe
Subsetting and Visualization Tool for Any location on Globe

Demo:

http://daac.ornl.gov/modisglobal



1975

2001


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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