HDF-EOS Maintenance and Development

1
HDF-EOS Maintenance and Development

• Larry Klein, Shen Zhao, Abe Taaheri,
• Ray Milburn, and Cid Praderas
• L-3 Communications GSI
• October 27, 2004

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Major Recent HDF-EOS5 Development

• Changed buffer allocation from Static to Dynamic
  (32KB chunks) for Structural Metadata.
• Added capability for
• - handling character string data fields.
• - suppressing HDF5 and/or HDF-EOS5 error
  reports.
• - Szip (Shuffling) compression
• - handling attributes associated with the
  "Geolocation Fields" group in the Swath API.
• Added routines to handle aliases for grid
  objects.
• Added support for Geographic projection.
• Last release Aug. 04, HDF-EOS2.12, HDF-EOS5.1.8
• Next release Jan. 05, with HDF5-1.6.3, Szip1.2

3
HDFView Browser Plug-in

• A Java-based browse tool from NCSA for HDF4 and
  HDF5 based data.
• Our HDF-EOS plugin extends HDFView capability to
  HDF-EOS data.
• This plug-in module does not change
  functionality. e.g. all HDFView copy, save,
  editing, image display, etc. for HDF4 and 5
  objects remains.
• The look and feel of HDFView is identical when
  displaying either HDF or HDF-EOS objects.
• Users can access a complete breakdown of HDF-EOS
  objects. e.g. display of grid info., projection
  info., dimensions, datafields, and attributes. 

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HDFView

• Release in early Nov., 2004
• - A separate HDF-EOS plugin Users install
  HDFView 2.1 then build in the HDF-EOS plugin.
• - Ability to do "Save as" for HDF-EOS5 modify
  individual values in grid or swath data. Delete
  entire grids or swaths. Save the result.
• - Separate help window for HDF-EOS objects
• Future
• - Ability to save HDF-EOS 2 files.
• - Retain HDF-EOS 5 profile information.
• - Cut/paste objects, modify/delete attributes.
• - Ability to create new grids/swaths.

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HDF-EOS to GeoTIFF Converter (HEG)

• A utility that converts EOSDIS data from HDF-EOS
  format to Geographical Information System
  (GIS)-compatible formats (GeoTIFF).
• Details of internal file structures are
  transparent to users.
• Two versions available
• A downloadable desktop version
• Access through NASA EOS online storage (Data
  Pools)
• Will implement HEG in Stand-alone Data Pool
• Include in OGC (Open Geospatial Consortium)
  prototype for Web Chaining Services, and
• DOWS (Deploy OGC Web Services) at EOS archive
  centers.

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HEG Functionality

• Subsetting (spatial, field, band)
• Conversion to a single-band or multi-band
  GeoTIFFs
• HDF-EOS Swath to HDF-EOS Grid
• HDF-EOS Swath or Grid to GeoTIFF
• HDF-EOS Swath or Grid to generic binary (with
  ASCII metadata file)
• Stitching (mosaicing) subsetting
• Command line execution or with Java-based GUI
• Reprojection ( to UTM, PS, TM, STP, LCC, LAMAZ,
  GEO, SIN)
• Subsampling (Subsample stacks)

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HEG Functionality

• Metadata preservation/creation.
• Currently supports MODIS, MISR, and ASTER
  products (gt80 products) (AIRS and AMSR-E
  proposed)
• Allows file selection from users local storage
• Operable on Sun, SGI, Win, Linux (64-bit soon),
  OS X
• Integrated into ECS Data Pool
• Reduces the transfer time of HDF-EOS data sets
  (if subset is requested)
• Provides the end-user with the exact file
  required by their application
• User Interface
• Portable, written in Java.
• Not dependent on COTS (e.g. IDL).