1. What is HDF-EOS? Information compiled from HDF-EOS Workshop II HDF-EOS Workshop III, 1999 ESDIS Project, Code 423 NASA/Goddard Space Flight Center Greenbelt MD 20771 USA

2. HDF-EOS, 1999HDF-EOS, UllmanSilde 2 HDF-EOS HDF-EOS defines standard “profiles” for the use of HDF in the domain of Earth Observing Data. HDF-EOS is a higher level library built on top of HDF structures and functions. Geolocation information is coupled to data for common data collection profiles of Point, Swath and Grid.Geolocation information is coupled to data for common data collection profiles of Point, Swath and Grid.

3. HDF-EOS, 1999HDF-EOS, UllmanSilde 3 HDF-EOS Point Intended use –Discrete points in time and/or location. –Table of data linked to table of geographic information. –8-level Hierarchical, each level may contain indices to the level below

4. HDF-EOS, 1999HDF-EOS, UllmanSilde 4 Hierarchical links: Every level in a Point data set must be linked into the hierarchy. Before two levels can be linked, a link field must exist HDF-EOS Point

5. HDF-EOS, 1999HDF-EOS, UllmanSilde 5 HDF-EOS Point No presently defined data sets from Landsat or Terra instruments. Likely use in validation campaigns.

6. HDF-EOS, 1999HDF-EOS, UllmanSilde 6 HDF-EOS Swath Intended use –Across track scanning instruments. –Sounding instruments –Level 1: Geolocated Sensor Units –Level 2: Geophysical Parameters derived from Level 1.

7. HDF-EOS, 1999HDF-EOS, UllmanSilde 7 “Longitude” “Latitude” Dimension Name: Geotrack Size: 21 Dimension Name: Geotrack Size: 21 Dimension Name: Scan Size: 16 Dimension Name: Scan Size: 16 Dimension Name: Track Size: 42 Dimension Name: Track Size: 42 Map1 DataDimension: “Track” Geodimension: “Geotrack” Offset: 1 Increment: 2 Map1 DataDimension: “Track” Geodimension: “Geotrack” Offset: 1 Increment: 2 “Brightness Temperature” “Time” HDF-EOS Swath Data fields Geolocation fields

8. HDF-EOS, 1999HDF-EOS, UllmanSilde 8 HDF-EOS Swath 74 HDF-EOS Swath Products are defined for distribution from EOSDIS after Terra launch. ASTER, CERES, Landsat 7, MISR, MODIS and MOPITT

9. HDF-EOS, 1999HDF-EOS, UllmanSilde 9 HDF-EOS Grid Intended use –Variables mapped on uniform space-time grid scales –Level 3 - Gridded single measurement parameters – Level 4 - Modeled or derived from multiple measurements

10. HDF-EOS, 1999HDF-EOS, UllmanSilde 10 HDF-EOS Grid Xdim Size: 2000 Ydim Size: 800 Projinfo Altitude Size 30

11. HDF-EOS, 1999HDF-EOS, UllmanSilde 11 HDF-EOS Grid Projections Supported Geographic Transverse Mercator Universal Transverse Mercator Hotine Oblique Mercator Space Oblique Mercator Polar Stereographic Lambert Azimuthal Equal Area Lambert Conformal Conic Polyconic Interrupted Goode’s Homolosine Integerized Sinusoidal Compression Methods Run-Length Encoding Adaptive Huffman Gzip

12. HDF-EOS, 1999HDF-EOS, UllmanSilde 12 HDF-EOS Grid 128 HDF-EOS Grid Products are defined for distribution from EOSDIS after Terra launch. ASTER, CERES, ECS Ancillary, MISR, MODIS, MOPITT

13. HDF-EOS, 1999HDF-EOS, UllmanSilde 13 Product Levels Level 0 - Reconstructed, unprocessed instrument/pay-load data at full resolution; any and all communications artifacts, e.g., synchronization frames, communications headers, duplicate data removed. Level 1A- Reconstructed, unprocessed instrument data at full resolution, time- referenced, and annotated with ancillary information, including radiometric and geometric calibration coefficients and georeferencing parameters, e.g., platform ephemeris, computed and appended but not applied to the Level 0 data. Level 1B - Level 1A data that have been processed to sensor units (not all instruments will have a Level 1B equivalent). Level 2 - Derived geophysical variables at the same resolution and location as the Level 1 source data. Level 3 - Variables mapped on uniform space-time grid scales, usually with some completeness and consistency. Level 4 - Model output or results from analyses of lower level data, e.g., variables derived from multiple measurements.

14. HDF-EOS, 1999HDF-EOS, UllmanSilde 14 One or more HDF data objects: –Portability –Elementary data access –Basic self-description One or more HDF-EOS data objects: –Geolocation information tightly coupled to data –Fully standardized geographical subsetting –Moderate self-description EOSDIS Metadata ODL in a “text annotation” –ECS ingest, archiving, search, and distribution –Enhanced self-description An HDF File Key

15. HDF-EOS, 1999HDF-EOS, UllmanSilde 15 An HDF file with a set of HDF data objects Services Provided PortabilityPortability Elementary data accessElementary data access Basic self-descriptionBasic self-description Services Not Provided Geolocation information tightly coupled to the dataGeolocation information tightly coupled to the data Fully standardized geographical subsettingFully standardized geographical subsetting ECS ingest, archiving, search, and distributionECS ingest, archiving, search, and distribution Enhanced self-descriptionEnhanced self-description

16. HDF-EOS, 1999HDF-EOS, UllmanSilde 16 Services Provided PortabilityPortability Elementary data accessElementary data access Moderate self-descriptionModerate self-description Geolocation information tightly coupled to the dataGeolocation information tightly coupled to the data Fully standardized geographical subsettingFully standardized geographical subsetting Services Not Provided ECS ingest, archiving, search, and distributionECS ingest, archiving, search, and distribution Enhanced self-descriptionEnhanced self-description An HDF file with a set of HDF-EOS data objects

17. HDF-EOS, 1999HDF-EOS, UllmanSilde 17 Services Provided PortabilityPortability Elementary data accessElementary data access Moderate self-descriptionModerate self-description Geolocation information tightly coupled to some of the dataGeolocation information tightly coupled to some of the data Partially standardized geographical subsettingPartially standardized geographical subsetting Services Not Provided ECS ingest, archiving, search, and distributionECS ingest, archiving, search, and distribution Enhanced self-descriptionEnhanced self-description Fully standardized geographical subsettingFully standardized geographical subsetting An HDF file with a mixed set of HDF-EOS and HDF data objects

18. HDF-EOS, 1999HDF-EOS, UllmanSilde 18 Services Provided PortabilityPortability Elementary data accessElementary data access ECS ingest, archiving, search, and distributionECS ingest, archiving, search, and distribution Enhanced self-descriptionEnhanced self-description Services Not Provided Geolocation information tightly coupled to the dataGeolocation information tightly coupled to the data Fully standardized geographical subsettingFully standardized geographical subsetting An HDF file with a set of HDF data objects with EOSDIS metadata

19. HDF-EOS, 1999HDF-EOS, UllmanSilde 19 Services Provided PortabilityPortability Elementary data accessElementary data access Geolocation information tightly coupled to the dataGeolocation information tightly coupled to the data Fully standardized geographical subsettingFully standardized geographical subsetting ECS ingest, archiving, search, and distributionECS ingest, archiving, search, and distribution Enhanced self-descriptionEnhanced self-description Services Not Provided None of the above listed services.None of the above listed services. An HDF file with a set of HDF-EOS data objects with EOSDIS metadata