MODIS Tools available through Land Processes DAAC

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MODIS Tools available through Land Processes DAAC

• Customer Support
• edc_at_eos.nasa.gov
• http//lpdaac.usgs.gov/custhelp

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MODIS Tools Available

• Background of Tool Development
• List of Tools
• MODIS Reprojection Tool (MRT)
• MRT Swath Tool
• LDOPE Tools
• MODextract

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Background of Tool Development

• Anticipated needs of users
• Challenges
• HDF-EOS format
• Integerized Sinusoidal (V003) or Sinusoidal
  (V004)
• Unpack the quality assessment information
• Data Access
• Aids
• Conversion/subsetting tools
• Reprojection tools
• Data Access automation

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MODIS Reprojection Tool (MRT)

• LP DAAC anticipated a user need for special
  software tools to handle the Level-2G, Level 3,
  Level 4 MODIS
• land data products distributed in HDF-EOS
  format and in SIN and ISIN projections

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MRT Requirements

• Platforms Supported
• LINUX
• IRIX 6.5
• Solaris 2.7
• Windows 95/98/ME/NT/2000/XP

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MRT Capabilities

• Reprojects MODIS products in ISIN and SIN using
  the Generalized Cartographic Transformation
  Package (GCTP)
• Output projections

• Geographic
• Hammer
• Mollweide
• Sinusoidal
• UTM
• Transverse Mercator
• Equirectangular

• Integerized Sinusoidal
• Goodes Interrupted Homolosine
• Lambert Azimuthal
• Lambert Conformal Conic
• Polar Stereographic
• Albers Equal Area

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MRT Capabilities

• Spectral subsetting
• Any subset of SDSs may be selected
• Spatial subsetting
• Subset by input lat/long or line/sample,
• or output projection coordinates
• Resampling
• nearest neighbor
• bilinear interpolation
• cubic convolution

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MRT Capabilities

• Datum conversions
• NAD 27, NAD 83, WGS 66, WGS 72, WGS 84
• File formats
• Input HDF-EOS and flat binary
• Output HDF-EOS, GeoTIFF, and flat binary
• with header record
• Mosaicking of tiles
• GUI or Command-line interface
• Requires Java 1.3 or higher

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MRT Capabilities

• GUI mode
• MS_DOS or Unix prompt gtModisTool
• the resample.log file (in /bin directory) tracks
• all messages and errors from MRT
• Command-line mode
• Excellent for script/batch file processing
• MS_DOS or Unix prompt gtresample
• parameter filename required
• user specified parameters such as I/O options,
  resampling method, projection, subsetting, pixel
  size, logfile name

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http//lpdaac.usgs.gov/landdaac/tools/modis/index.
asp
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MRT Installation

• Download from
• http//lpdaac.usgs.gov/landdaac/tools/modis/index
  .asp
• Register as a user (automatically emailed
  password)
• Download all code for appropriate platform
• Download User Guide and Release Notes
• Unzip archive file
• Run install script
• FOR PCs NO SPACES ALLOWED IN DIRECTORY NAMES
• C\Program Files\ no good ? C\MRT\

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Reprojection Example
BEFORE
AFTER
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MRT Swath Tool
LP DAAC provides a tool for allowing users to
reproject all MODIS swath (LP DAAC and direct
broadcast Level 1 and Level 2) data
products Platforms Supported LINUX IRIX
Solaris Windows
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MRT Swath Capabilities

• Grids MODIS swath products to a user-specified
• projection
• Requires associated Geolocation Fields file for
• geocoding (MOD03 from GES DAAC)
• Output projections

• Geographic
• Hammer
• Mollweide
• Sinusoidal
• UTM
• Transverse Mercator
• Equirectangular

• Integerized Sinusoidal
• Goodes Interrupted Homolosine
• Lambert Azimuthal
• Lambert Conformal Conic
• Polar Stereographic
• Albers Equal Area

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MRT Swath Capabilities

• Spectral subsetting
• Any subset of SDSs may be selected that is of
  the nominal MODIS scan size
• Spatial subsetting
• Subset by input lat/long or line/sample,
• or output projection coordinates
• Resampling
• nearest neighbor
• bilinear interpolation
• cubic convolution

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But it helps to know some tips about about file
naming conventions! Swath-based products are
spatially referenced (implicitly) by acquisition
date time
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NAMING CONVENTIONS DATA SET NAMES
MOD09A1 MODIS/Terra Surface Reflectance 8-Day
L3 Global 500m ISIN Grid
Grid or not
ShortName
Instrument
Spatial Resolution
Platform
Global or Swath
Parameter
Processing Level
Temporal Resolution
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NAMING CONVENTIONS DATA SET NAMES
MOD09A1 MODIS/Terra Surface Reflectance 8-Day
L3 Global 500m ISIN Grid
Grid or not
ShortName
Instrument
Spatial Resolution
Platform
Global or Swath
Parameter
Processing Level
Temporal Resolution
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NAMING CONVENTIONS FILE NAMES
MOD09A1.A2000185.h11v05.003.2000193081710.hdf
Julian Processing Date
ShortName
TileID
Julian Acquisition Date
Processing Version
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What do I need to know to get the MOD03 product
for my granule of interest? Answer Metadata
attributes
Parse the filename MOD11_L2.A2004227.0015.004.200
4229002238.hdf (Acquisition
yearjulianday.time) Consult the metadata (.met or
.xml)

• -ltRangeBeginningTimegt001500.0000000lt/RangeBeginn
  ingTimegt
• ltRangeBeginningDategt2004-08-14lt/RangeBeginningDat
  egt
• ltRangeEndingTimegt002000.0000000lt/RangeEndingTime
  gt  
• ltRangeEndingDategt2004-08-14lt/RangeEndingDategt

Use this information as EDG search
parameters Product shortname MOD11_L2 Start
Date and Time 2004-08-14, 001500 End Date and
time 2004-08-14, 002000
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MRT Swath Capabilities

• Datum conversions
• Not supported
• Data Types
• 8 and 16-bit integers, signed and unsigned
• File formats
• Input HDF-EOS
• Output HDF-EOS, GeoTIFF, and flat binary
• with header record
• GUI or Command-line interface
• Requires Java 1.3 or higher

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MRT Swath Capabilities

• GUI mode
• MS_DOS or Unix prompt gtModisSwathTool
• the mrtswath.log file (in /bin directory) tracks
• all messages and errors from MRT swath
• Command-line mode
• Excellent for script/batch file processing
• MS_DOS or Unix prompt gtswath2grid
• input individual parameters from command-line
• option for input parameter file (recommended)

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http//lpdaac.usgs.gov/landdaac/tools/mrtswath/ind
ex.asp
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MRT Swath Installation

• Download from
• http//lpdaac.usgs.gov/landdaac/tools/mrtswath/ind
  ex.asp
• Register as a user (automatically emailed
  password)
• Download all code for appropriate platform
• Download User Guide and Release Notes
• Unzip archive file
• Run install script
• FOR PCs NO SPACES ALLOWED IN DIRECTORY NAMES
• C\Program Files\ no good ? C\MRT\

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After
Before
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MODextract script
LP DAAC provides an offline capability for
downloading MODIS products via FTP from the LP
DAAC DataPool Script is downloaded and run
locally on the end-users machine Platforms
Supported GNU/LINUX 2.4.21-15.ELsmp IRIX
6.5 Solaris 8 Has not been ported to
Windows
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MRTextract Capabilities

• MODextract executes a user-supplied input
• parameter file
• Only Gridded MODIS products with horizontal and
  vertical tile locations are supported
• (MOD13A1 MOD11A1 MOD17A2 etc)
• Requires expect downloaded from
• http//expect.nist.gov/
• Expect is a tool that automates interactive
• applications such as ftp, rlogin, telnet, etc

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MODextract Installation
http//lpdaac.usgs.gov/landdaac/tools/datapool/dis
t/download.asp
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MODextract Operation
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Example of Input Parameter File
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MODextract Execution
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LDOPE tools
The LDOPE software tools were developed to
assist with the analysis and quality assessment
of the MODIS Land (MODLAND) products. The tools
have been developed with feedback from the
MODLAND science team and incorporate the
scientific knowledge, experience and insights
gained during the substantial MODLAND product
development period.
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LDOPE Requirements

• Platforms Supported
• LINUX Redhad 7.3
• IRIX 6.5
• Solaris 2.8
• Windows 2000/XP

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LDOPE Capabilities

• Command_line interface
• Provides 25 functions for data manipulation of
• MODIS data products
• Includes reading attributes, computing SDS
  values, masking, mosaicking capabilities
• Unpack_sds_bits function will unpack the QA
  information contained within the QA SDSs

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LDOPE Capabilities
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http//lpdaac.usgs.gov/landdaac/tools/ldope/index.
asp
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LDOPE Installation

• Download from
• http//lpdaac.usgs.gov/landdaac/tools/modis/inde
  x.asp
• Register as a user (automatically emailed
  password)
• Download all code for appropriate platform
• Can download runtimes or source code to be
  compiled
• Download User Guide and Release Notes
• Unzip/untar archive file
• Can execute runtimes on command-line or compile
  source code

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Example of unpack_sds_bits
Command-line execution
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Example of unpack_sds_bits
Bits 2-5 unpacked are depicted above with green
as good quality, red as fair-poor quality, blue
as not useful quality.
MODIS/Terra Vegetation Indices MIR/NIR/Red bands
as RGB