What is HDF-EOS?
Information compiled
from HDF-EOS Workshop II

HDF-EOS Workshop III, 1999

ESDIS Project, Code 423
NASA/G...
HDF-EOS
• HDF-EOS defines standard “profiles” for the
use of HDF in the domain of Earth Observing
Data.
• HDF-EOS is a hig...
HDF-EOS Point
• Intended use
– Discrete points in time
and/or location.
– Table of data linked to
table of geographic
info...
HDF-EOS Point
Latitude
25.2645
22.3549
23.2564

Longitude
091.2564
-93.4657
-89.2546

Buoy_ID
0126
3564
1256

Hierarchical...
HDF-EOS Point
• No presently defined data sets from Landsat
or Terra instruments.
• Likely use in validation campaigns.

H...
HDF-EOS Swath
• Intended use
– Across track scanning
instruments.
– Sounding instruments
– Level 1: Geolocated
Sensor Unit...
HDF-EOS Swath
Data fields
“Brightness
Temperature”

Dimension
Dimension
Name: Scan
Name: Scan
Size: 16
Size: 16
Dimension
...
HDF-EOS Swath
• 74 HDF-EOS Swath Products are defined for
distribution from EOSDIS after Terra launch.
• ASTER, CERES, Lan...
HDF-EOS Grid
• Intended use
– Variables mapped on
uniform space-time grid
scales
– Level 3 - Gridded single
measurement
pa...
HDF-EOS Grid
Altitude
Size 30

Xdim
Size: 2000

Projinfo

Ydim
Size: 800

HDF-EOS,

HDF-EOS, Ullman

Silde 10
HDF-EOS Grid
Projections Supported
•
•
•
•
•
•
•

Geographic
Transverse Mercator
Universal Transverse Mercator
Hotine Obli...
HDF-EOS Grid
• 128 HDF-EOS Grid Products are defined for
distribution from EOSDIS after Terra launch.
• ASTER, CERES, ECS ...
Product Levels
•

•

Level 0 - Reconstructed, unprocessed
instrument/pay-load data at full
resolution; any and all communi...
Key

An HDF File

One or more HDF data objects:
– Portability

– Elementary data access
– Basic self-description
One or mo...
An HDF file with a set of
HDF data objects
Services Provided

Services Not Provided

• Portability
• Elementary data acces...
An HDF file with a set of
HDF-EOS data objects
Services Provided

Services Not Provided

•
•
•
•

•

Portability
Elementar...
An HDF file with a mixed set
of HDF-EOS and HDF data
objects
Services Provided

Services Not Provided

• Portability

•

E...
An HDF file with a set of
HDF data objects with
EOSDIS metadata
Services Provided

Services Not Provided

• Portability

•...
An HDF file with a set of
HDF-EOS data objects with
EOSDIS metadata
Services Provided
• Portability
• Elementary data acce...
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What is HDF-EOS?

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What is HDF-EOS?

  1. 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. 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. HDF-EOS, HDF-EOS, Ullman Silde 2
  3. 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 Longitude Temperature oC Dew Point o C 61.12 -149.48 15.00 5.00 45.31 -122.41 17.00 5.00 38.50 -77.00 24.00 7.00 38.39 -90.15 27.00 11.00 M HDF-EOS, Latitude M M M HDF-EOS, Ullman Silde 3
  4. 4. HDF-EOS Point Latitude 25.2645 22.3549 23.2564 Longitude 091.2564 -93.4657 -89.2546 Buoy_ID 0126 3564 1256 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, Buoy _ID 0126 0126 3564 1256 1256 0126 3564 HDF-EOS, Ullman Time 01:26 05:56 06:28 08:12 09:58 09:59 10:16 Wave Height(ft) 2.54 3.58 12.64 7.58 7.76 4.23 10.23 Silde 4 Temp (C) 18.4 18.2 16.4 17.1 17.2 20.1 17.5
  5. 5. HDF-EOS Point • No presently defined data sets from Landsat or Terra instruments. • Likely use in validation campaigns. HDF-EOS, HDF-EOS, Ullman Silde 5
  6. 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. Scan Lines Instrument Path Along Track Instrument Path Along Track HDF-EOS, HDF-EOS, Ullman Silde 6
  7. 7. HDF-EOS Swath Data fields “Brightness Temperature” Dimension Dimension Name: Scan Name: Scan Size: 16 Size: 16 Dimension Dimension Name: Track Name: Track Size: 42 Size: 42 Dimension Dimension Name: Geotrack Name: Geotrack Size: 21 Size: 21 Geolocation fields “Time” “Latitude” “Longitude” Map1 Map1 DataDimension: “Track” DataDimension: “Track” Geodimension: “Geotrack” Geodimension: “Geotrack” Offset: 1 Offset: 1 Increment: 2 Increment: 2 HDF-EOS, HDF-EOS, Ullman Silde 7
  8. 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 HDF-EOS, HDF-EOS, Ullman Silde 8
  9. 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 HDF-EOS, HDF-EOS, Ullman Silde 9
  10. 10. HDF-EOS Grid Altitude Size 30 Xdim Size: 2000 Projinfo Ydim Size: 800 HDF-EOS, HDF-EOS, Ullman Silde 10
  11. 11. HDF-EOS Grid Projections Supported • • • • • • • Geographic Transverse Mercator Universal Transverse Mercator Hotine Oblique Mercator Space Oblique Mercator Polar Stereographic Lambert Azimuthal Equal Area HDF-EOS, • • • Lambert Conformal Conic Polyconic Interrupted Goode’s Homolosine • Integerized Sinusoidal Compression Methods • • • Run-Length Encoding Adaptive Huffman Gzip HDF-EOS, Ullman Silde 11
  12. 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 HDF-EOS, HDF-EOS, Ullman Silde 12
  13. 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, timereferenced, 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. HDF-EOS, • • • • 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. HDF-EOS, Ullman Silde 13
  14. 14. Key An HDF File 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 HDF-EOS, HDF-EOS, Ullman Silde 14
  15. 15. An HDF file with a set of HDF data objects Services Provided Services Not Provided • Portability • Elementary data access • Basic self-description • • • • HDF-EOS, Geolocation information tightly coupled to the data Fully standardized geographical subsetting ECS ingest, archiving, search, and distribution Enhanced self-description HDF-EOS, Ullman Silde 15
  16. 16. An HDF file with a set of HDF-EOS data objects Services Provided Services Not Provided • • • • • Portability Elementary data access Moderate self-description Geolocation information tightly coupled to the data • Fully standardized geographical subsetting HDF-EOS, • ECS ingest, archiving, search, and distribution Enhanced self-description HDF-EOS, Ullman Silde 16
  17. 17. An HDF file with a mixed set of HDF-EOS and HDF data objects Services Provided Services Not Provided • Portability • ECS ingest, archiving, search, and distribution • Enhanced self-description • Fully standardized geographical subsetting • Elementary data access • Moderate self-description • Geolocation information tightly coupled to some of the data • Partially standardized geographical subsetting HDF-EOS, HDF-EOS, Ullman Silde 17
  18. 18. An HDF file with a set of HDF data objects with EOSDIS metadata Services Provided Services Not Provided • Portability • Geolocation information tightly coupled to the data • Fully standardized geographical subsetting • Elementary data access • ECS ingest, archiving, search, and distribution • Enhanced self-description HDF-EOS, HDF-EOS, Ullman Silde 18
  19. 19. An HDF file with a set of HDF-EOS data objects with EOSDIS metadata Services Provided • Portability • Elementary data access • Geolocation information tightly coupled to the data • Fully standardized geographical subsetting HDF-EOS, • ECS ingest, archiving, search, and distribution • Enhanced self-description Services Not Provided • None of the above listed services. HDF-EOS, Ullman Silde 19

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