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
• 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. 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
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. 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
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. 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
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. 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. 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. 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. 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. 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. 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. 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