An Overview of HDF-EOS (Part II)
 

An Overview of HDF-EOS (Part II)

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HDF AND HDF-EOS WORKSHOP II (1998) ...

HDF AND HDF-EOS WORKSHOP II (1998)

Source: http://hdfeos.org/workshops/ws02/presentations/ilg2/ilg2.ppt

Slide 11 discusses the key difference between HDF and HDF-EOS: object level, not file-level.

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An Overview of HDF-EOS (Part II) An Overview of HDF-EOS (Part II) Presentation Transcript

  • An Overview of HDF-EOS (Part II) Doug Ilg Raytheon STX Doug.Ilg@gsfc.nasa.gov (301) 441-4089 1
  • Outline The Swath Interface What is an HDF-EOS File? 2
  • In str u me nt Pa th Swath Data Sets Instrument Profiles In str u m en t Pa th Instrument Scan Lines Along Track Along Track 3
  • A Swath Structure Dimension Name: Scan Size: 16 “Temp” “Time” Dimension Name: Track Size: 42 Dimension Name: Geotrack Size: 21 Map1 DataDimension: “Track” Geodimension: “Geotrack” Offset: 1 Increment: 2 4
  • Components of the Swath Interface Access Definition Basic I/O Inquiry Utility Subset 5
  • Tips on Writing a Swath Order of calls is significant: – define dimensions before using them to define fields of maps – setting a compression method affects all subsequently defined fields Unless a dimension map is defined, a 1to-1 mapping is assumed during subsetting. This can produce strange results. 6
  • Swath Subsetting Features By Time – SWdeftimeperiod/SWextractperiod By Geolocation – SWdefboxregion/SWextractregion By “Vertical” field – SWdefvrtregion/SWextractregion Tip: use Time or Geolocation first, then Vertical 7
  • Compression Methods for Swaths Run-Length Encoding Adaptive Huffman Gzip 8
  • Question: What’s an HDF-EOS File? 9
  • Some Answers ECS: An HDF file with ECS metadata Any file with an HDF-EOS object in it A file with only HDF-EOS objects in it 10
  • My Answer You’ve asked the wrong question. The difference between HDF and HDFEOS is at the object level, not the file level. 11
  • Key An HDF file HDF-EOS One or more HDF-EOS data objects with attendant structural metadata ECS Metadata Core and possibly Archive metadata HDF One or more HDF data objects 12
  • HDF •Portability •Elementary data access •Basic self-description HDF-EOS • Geolocation information tightly coupled to data • Fully standardized geographical subsetting • Moderate self-description ECS Metadata • ECS ingest, archiving, search, and distribution • Enhanced self-description 13
  • HDF An HDF file with a set of HDF data objects Services Provided •Portability •Elementary data access •Basic self-description Services Not Provided • Geolocation information tightly coupled to the data • Fully standardized geographical subsetting • ECS ingest, archiving, search, and distribution • Enhanced self-description 14
  • HDF-EOS An HDF file with a set of HDF-EOS data objects Services Provided • Portability • Elementary data access • Moderate self-description • Geolocation information tightly coupled to the data • Fully standardized geographical subsetting Services Not Provided • ECS ingest, archiving, search, and distribution • Enhanced self-description 15
  • Services Provided • Portability • Elementary data access HDF-EOS • Moderate selfdescription • Geolocation information HDF tightly coupled to some of the data • Partially standardized geographical subsetting An HDF file with a mixed Services Not Provided set of HDF-EOS and HDF • ECS ingest, archiving, data objects search, and distribution • Enhanced self-description • Fully standardized geographical subsetting 16
  • HDF ECS Metadata An HDF file with a set of HDF data objects with ECS metadata Services Provided • Portability • Elementary data access • ECS ingest, archiving, search, and distribution • Enhanced self-description Services Not Provided • Geolocation information tightly coupled to the data • Fully standardized geographical subsetting 17
  • HDF-EOS ECS Metadata An HDF file with a set of HDF-EOS data objects with ECS metadata Services Provided • Portability • Elementary data access • Geolocation information tightly coupled to the data • Fully standardized geographical subsetting • ECS ingest, archiving, search, and distribution • Enhanced self-description Services Not Provided • None 18
  • HDF-EOS HDF ECS Metadata An HDF file with a mixed set of HDF and HDF-EOS data objects with ECS metadata Services Provided • Portability • Elementary data access • Geolocation information tightly coupled to some of the data • Partially standardized geographical subsetting • ECS ingest, archiving, search, and distribution • Enhanced self-description Services Not Provided • Fully standardized geographical subsetting 19