modis land product subsets

MODIS Land Product SubsetsMODIS Land Product Subsets

Suresh K. Santhana Vannan, Robert B. Cook, Bruce E. Wilson, Lisa M. Olsen

HDF and HDF-EOS Workshop XIIHDF and HDF-EOS Workshop XIIOctober 15 – October 17, 2008October 15 – October 17, 2008

ORNL DAACORNL DAACOak Ridge National LaboratoryOak Ridge National Laboratory

Distributed Active Archive CenterDistributed Active Archive CenterOak Ridge, Tennessee, USA Oak Ridge, Tennessee, USA

What is MODISWhat is MODIS MODMODerate Resolution erate Resolution IImaging maging SSpectroradiometer pectroradiometer

Hyper-Spectral sensor onboard two satellites (Terra and Aqua)Hyper-Spectral sensor onboard two satellites (Terra and Aqua)

Terra MODIS and Aqua MODIS are viewing the entire Earth's surface every Terra MODIS and Aqua MODIS are viewing the entire Earth's surface every 1 to 2 days1 to 2 days, acquiring data in , acquiring data in 36 spectral bands36 spectral bands, or groups of wavelengths, or groups of wavelengths

Data stored in Data stored in HDF-EOS HDF-EOS gridded file formatgridded file format

Source : http://aqua.nasa.gov

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

Users (Field researchers) have some inconveniences :Users (Field researchers) have some inconveniences :

Volume

AccessibilityAccessibility

Data FormatData Format

Processing TimeProcessing 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

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 sitesMODIS Subsets for Selected sites

Data Formats OfferedData Formats Offered ASCII – 7x7 km subsets ASCII – 7x7 km subsets GeoTIFF – 25x25 km subsetsGeoTIFF – 25x25 km subsets

MODIS Products offered at ORNL-DAAC

Surface ReflectanceSurface Reflectance

Surface TemperatureSurface Temperature

Land CoverLand Cover

Vegetation Phenology

NDVI / EVINDVI / EVI

LAI / fPARLAI / fPAR

Net PhotosynthesisNet Photosynthesis

Annual NPP Annual NPP

Albedo (calc)Albedo (calc)

Reflectance – BRDF AdjustedReflectance – BRDF Adjusted

Subsetting and Visualization Tool for Any location on Globe

Demo:Demo:http://daac.ornl.gov/modisglobal

Case Study: Deforestation in Amazon

1975

2001

1975

2001

2000 2008

Dec 31 2010

Jan 1 2011

MODIS Subsetting Web Service MODIS Subsetting Web Service

################# ORNL DAAC MODIS Web service - Perl client#################use SOAP::Lite @params= 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,0.000,2MOD11A2.A2003001.h26v05.005.2007264203857.Clear_sky_nights,MOD11A2,A2003001,Lat37.7Lon110Samp1Line1,2007264203857,Clear_sky_nights,NA,0.000,254…….

MOD11A2.A2003001.h26v05.005.2007264203857.Clear_sky_days,MOD11A2,A2003001,Lat37.7Lon110Samp1Line1,2007264203857,Clear_sky_days,NA,0.000,2MOD11A2.A2003001.h26v05.005.2007264203857.Clear_sky_nights,MOD11A2,A2003001,Lat37.7Lon110Samp1Line1,2007264203857,Clear_sky_nights,NA,0.000,254…….

f(x)f(x)

Client ServerSOAPSOAP

ScopeScope Tool for scientific research (Environmental Tool for scientific research (Environmental

Impact assessment, carbon budgeting, etc.)Impact assessment, carbon budgeting, etc.) Classroom education and projects for studentsClassroom education and projects for students Time series, trend analysis Time series, trend analysis GIS overlay analysisGIS overlay analysis Statistical analysis (Across many years and Statistical analysis (Across many years and

across different land cover types)across different land cover types) Validation of MODIS products and other remote Validation of MODIS products and other remote

sensing productssensing products

Questions?Questions?

LinksLinks

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