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Zhangshi Yin, Jingli Yang, Bob Bane, Muhammad Rabi, Richard Ullman Data Usability Group, NASA/GSFC

HDF-EOS Data Extractor & Metadata Updater. Zhangshi Yin, Jingli Yang, Bob Bane, Muhammad Rabi, Richard Ullman Data Usability Group, NASA/GSFC NASA/GSFC, Code 423 For HDF-EOS Workshop VII September 23-25, 2003. HEEX.

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Zhangshi Yin, Jingli Yang, Bob Bane, Muhammad Rabi, Richard Ullman Data Usability Group, NASA/GSFC

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  1. HDF-EOS Data Extractor & Metadata Updater Zhangshi Yin, Jingli Yang, Bob Bane, Muhammad Rabi, Richard Ullman Data Usability Group, NASA/GSFC NASA/GSFC, Code 423 For HDF-EOS Workshop VII September 23-25, 2003

  2. HEEX • HDF-EOS Data Extractor (HEEX) is a tool for data users to extract HDF-EOS data to binary or ASCII data format in HTML or XML.

  3. Motivation • Flat binary and ASCII data are required by some users. • They can be imported to IDL, ARC/INFO and used in any programming. • Extracted flat binary and ASCII data can be another intermediate data format for storing EOS data.

  4. HEEX Flowchart HDF-EOS Data HTML XML Binary Data ASCII Data Binary Data ASCII Data

  5. Usage heex [-aehx] [-f] [FieldName] -o OutputDirectory HDF-EOS5FileName HDF-EOS5FileName: HDF-EOS5 file name. Required. -a Extract data to ASCII format. Default is binary. Optional. -e Extract every field. Optional. -f FieldName: extract a field data specified by objec/field. Optional. If no -e and -f options, only index file, no data. -h Help message. Optional. -o OutputDirectory: the directory to put data. Required. -x Extract IndexFile data to XML format. Default is html. Optional.

  6. Extracted Data • HEEX will extract all data into a directory indicated in -o optional by user.A file called Index.html or Index.xml in the directory will show all HDF-EOS data structure and where data are.

  7. Inex File  -HDFEOS-File Name=grid.he Type="HDFEOS" -HDFEOS -GRIDS -Grid +Parameters +Dimension -GridDataField +sst_mask_1 -HDFEOS_INFORMATION -COREMETADATA +CoreMetadata.0 +ARCHIVEMETADATA

  8. Inex File  -sst_mask_1 DataType=Integer Sign=false Size=1 +DimList +FieldStorage Data: ./Grid/sst_mask_1.dat

  9. HEMU • HDF-EOS Metadata Updater (HEMU) is a tool for data producers or usersto update metadata inside an HDF-EOS file (HDF-EOS2 and HDF-EOS5).

  10. Motivation • Users need to read metadata from HDF-EOS data. • Users need to write metadata files to HDF-EOS data replace all metadata in the HDF-EOS data. • Users need to update metadata in HDF-EOS data by merging metadata inside HDF-EOS data and metadata from .met files.

  11. Capabilities  1. Extract metadata from a dataset (-x option) to a text file which can then be modified with any text editor. This option does not modifythe HDF-EOS file. 2. Replace metadata with text from an external file (-f option). Thetext is syntax-checked for validity as ODL before updating.  3. Update metadata with text from an external file (-m option). Thisoption is designed to update metadata using a .met file.

  12. HEMU Read Flowchart HDF-EOS Data Read CoreMetadata InventoryMetadata ArchiveMetadata Metadata

  13. HEMU Write Flowchart .Met Data HDF-EOS Data Read Metadata Read Metadata Check Syntax Check Syntax Check Values: SHORTNAME PRODUCTIONDATETIME VERSIONID If equal, replace metadata in HDF-EOS using metadata in .met If not equal, exit

  14. HEMU Merge Flowchart .Met Data HDF-EOS Data Read Metadata Read Metadata Check Syntax Check Syntax Check Values: SHORTNAME PRODUCTIONDATETIME VERSIONID If equal, replace metadata in HDF-EOS using CollectionMetadata InventoryMetadata in .met and ArchiveMetadata in HDF-EOS If not equal, exit

  15. Usage  hemu [-h] HDF-EOSFileName -xmf [MetadataFileName] -h Print help message. -x Extract metadata from HDFEOS file. -m Update metadata with a .met file input. -f Forcibly replace metadata with metadata from input. HDF-EOSFileName: HDF-EOS file. Required. MetadataFileName: Metadata file. Optional (default is standard input/output).

  16. Syntax and Value Check • HEMU will check metadata syntax by ODL program. For -m and –f options (update metadata with a .met file), three parameters in INVENTORYMETADATA group (SHORTNAME, PRODUCTIONDATETIME, and VERSIONID) must match before the tool will modify the metadata.

  17. Get HEEX & HEMU   http://hdfeos.gsfc.nasa.gov/hdfeos/index.cfm

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