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HDF-EOS5 Validator Tool

HDF-EOS5 Validator Tool. Bob Bane Jingli Yang Richard Ullman Data Usability Task NASA/GSFC. HDF-EOS5 Validator. Validates HDF-EOS5 files against guidelines Guidelines are encoded in XML Output is a report with specific non-conformance messages. Why HDF-EOS5 Validator?.

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HDF-EOS5 Validator Tool

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  1. HDF-EOS5 Validator Tool Bob Bane Jingli Yang Richard Ullman Data Usability Task NASA/GSFC HDF-EOS Workshop VII

  2. HDF-EOS5 Validator • Validates HDF-EOS5 files against guidelines • Guidelines are encoded in XML • Output is a report with specific non-conformance messages HDF-EOS Workshop VII

  3. Why HDF-EOS5 Validator? • Insures that product files: • Have all data and metadata items they are supposed to contain • Those items are of correct name, type, and size • Validator is a tool mainly for data producers to check format of files before delivering them to users. HDF-EOS Workshop VII

  4. HDF-EOS5 file Validator report Validator Guidelines (in XML) HDF-EOS5 Validator HDF-EOS Workshop VII

  5. Like a checklist List of features that must/should be in file And their characteristics Not all-inclusive Extra things in file will not be reported XML Description of File Format Guidelines HDF-EOS Workshop VII

  6. What can be validated? • Swaths • Every swath • Swaths with a specific name • Fields • Data • Every/specific name • Geolocation • Every/specific name • Dimensions • Name, size HDF-EOS Workshop VII

  7. What can be validated (cont)? • Attributes • Global/Swath/Field • Type • String • Value/Set/regular expression • Integer/Float • Value/Range HDF-EOS Workshop VII

  8. Examples: StringValue • <StringValue/> • Any string • <StringValue matches=“seconds *”/> • “seconds” followed by spaces • <StringValue><OneOf><s>foo</s><s>bar</s></OneOf></StringValue> • “foo” or “bar” HDF-EOS Workshop VII

  9. Examples: IntValue • <IntValue/> • Any integer value • <IntValue min=“17” max=“42”/> • Integer between 17 and 42 inclusive • <IntValue> min=“0”/> • Non-negative integer HDF-EOS Workshop VII

  10. Example: Dimension • <Dimension name=“Latitude”/> • name is required • <Dimension name=“Height” size=“100”/> • size is fixed • <Dimension name=“X” min=“5” max=“10”/> • Size can be in range 5-10 HDF-EOS Workshop VII

  11. Examples: Attributes <Attributes> <Mandatory> <Attribute name=“InstrumentName”> <StringValue/> </Attribute> </Mandatory> <Optional> <Attribute name=“FieldCount”> <IntValue min=“0” max=“10”/> </Attribute> </Optional> </Attributes> HDF-EOS Workshop VII

  12. Overall File Structure <HDF-EOS-Validation-Definition> <Attributes>… <Swaths> <Every-Swath> <Attributes>… <Swath-Dimensions> <Mandatory-Dimensions> <Dimension … /> <Optional-Dimensions> <Dimension … /> HDF-EOS Workshop VII

  13. Overall File Structure (cont.) <GeolocationFields> <Every-GeolocationField> <DataType … /> <Dimensions> <d>Lat</d><d>Lon</d> <Attributes>… <GeolocationField-Named name=“LatLon”> <DataType … /> <Dimensions> … <Attributes> … HDF-EOS Workshop VII

  14. Implementation • Command line • C • HDF-EOS5 library • Open source XML parsing libraries • expat • SCEW • Portable to any HDF-EOS5 platform HDF-EOS Workshop VII

  15. Sample Output Report $ validate_hdfeos5 -x HIRDLS-definition.xml -h test.h5 SWATH HIRDLS Missing mandatory dimension: nWavel SWATH HIRDLS GEOLOCATION_FIELD Time ATTRIBUTE Units string "TAI " doesn't match <StringValue value="seconds"/> SWATH HIRDLS Missing mandatory geolocation field: Altitude SWATH HIRDLS Missing mandatory data field: TemperatureNormChiSq Errors: 4 HDF-EOS Workshop VII

  16. Status • Supports needs of Aura (our test case) • Swaths (no Grids/Points yet) • Prototype descriptions • For HIRDLS, MLS, OMI, TES • Based on Aura Data Format Guidelines document • Tested against Aura data samples, and correctly reported variances from guidelines • Goal is for product producers to write/maintain their own description files HDF-EOS Workshop VII

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