what is hdf-eos? information compiled from hdf-eos workshop ii hdf-eos workshop iii, 1999
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What is HDF-EOS?Information compiled
from HDF-EOS Workshop II
HDF-EOS Workshop III, 1999
ESDIS Project, Code 423NASA/Goddard Space Flight Center
Greenbelt MD 20771 USA
HDF-EOS, 1999 HDF-EOS, Ullman Silde 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 Geolocation information is coupled to data for common data collection profiles data for common data collection profiles of Point, Swath and Grid.of Point, Swath and Grid.
HDF-EOS, 1999 HDF-EOS, Ullman Silde 3
Latitude Longitude Tempera-ture oC
Dew PointoC
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 M M M
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
HDF-EOS, 1999 HDF-EOS, Ullman Silde 4
Latitude Longitude Buoy_ID25.2645 091.2564 012622.3549 -93.4657 356423.2564 -89.2546 1256
Buoy_ID
Time WaveHeight(ft)
Temp(C)
0126 01:26 2.54 18.40126 05:56 3.58 18.23564 06:28 12.64 16.41256 08:12 7.58 17.11256 09:58 7.76 17.20126 09:59 4.23 20.13564 10:16 10.23 17.5
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
HDF-EOS, 1999 HDF-EOS, Ullman Silde 5
HDF-EOS Point
• No presently defined data sets from Landsat or Terra instruments.
• Likely use in validation campaigns.
HDF-EOS, 1999 HDF-EOS, Ullman Silde 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.
InstrumentPath
Scan Lines
Along Track
InstrumentPath
Along Track
HDF-EOS, 1999 HDF-EOS, Ullman Silde 7
“Longitude”
“Latitude”DimensionName: GeotrackSize: 21
DimensionName: GeotrackSize: 21
DimensionName: ScanSize: 16
DimensionName: ScanSize: 16
DimensionName: TrackSize: 42
DimensionName: TrackSize: 42
Map1DataDimension: “Track”
Geodimension: “Geotrack”Offset: 1
Increment: 2
Map1DataDimension: “Track”
Geodimension: “Geotrack”Offset: 1
Increment: 2
“Brightness Temperature”
“Time”
HDF-EOS Swath
Data fields
Geolocation fields
HDF-EOS, 1999 HDF-EOS, Ullman Silde 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, 1999 HDF-EOS, Ullman Silde 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, 1999 HDF-EOS, Ullman Silde 10
HDF-EOS GridXdimSize: 2000
YdimSize: 800
Projinfo
AltitudeSize 30
HDF-EOS, 1999 HDF-EOS, Ullman Silde 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
HDF-EOS, 1999 HDF-EOS, Ullman Silde 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, 1999 HDF-EOS, Ullman Silde 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.
HDF-EOS, 1999 HDF-EOS, Ullman Silde 14
One or more HDF data objects:– PortabilityPortability
– Elementary data accessElementary data access– Basic self-descriptionBasic self-descriptionOne or more HDF-EOS data objects:– Geolocation information tightly coupled to dataGeolocation information tightly coupled to data– Fully standardized geographical subsettingFully standardized geographical subsetting– Moderate self-descriptionModerate self-descriptionEOSDIS Metadata ODL in a “text annotation” – ECS ingest, archiving, search, and distributionECS ingest, archiving, search, and distribution– Enhanced self-descriptionEnhanced self-description
An HDF FileKeyKey
HDF-EOS, 1999 HDF-EOS, Ullman Silde 15
An HDF file with a set of An HDF file with a set of HDF data objectsHDF data objects
Services ProvidedServices Provided• PortabilityPortability• Elementary data accessElementary data access• Basic self-descriptionBasic self-description
Services Services NotNot Provided Provided• Geolocation information Geolocation information
tightly coupled to the tightly coupled to the datadata
• Fully standardized Fully standardized geographical subsettinggeographical subsetting
• ECS ingest, archiving, ECS ingest, archiving, search, and distributionsearch, and distribution
• Enhanced self-Enhanced self-descriptiondescription
HDF-EOS, 1999 HDF-EOS, Ullman Silde 16
Services ProvidedServices Provided• PortabilityPortability• Elementary data accessElementary data access• Moderate self-descriptionModerate self-description• Geolocation information Geolocation information
tightly coupled to the tightly coupled to the datadata
• Fully standardized Fully standardized geographical subsettinggeographical subsetting
Services Services NotNot Provided Provided• ECS ingest, archiving, ECS ingest, archiving,
search, and distributionsearch, and distribution• Enhanced self-Enhanced self-
descriptiondescription
An HDF file with a set of An HDF file with a set of HDF-EOS data objectsHDF-EOS data objects
HDF-EOS, 1999 HDF-EOS, Ullman Silde 17
Services ProvidedServices Provided• PortabilityPortability• Elementary data accessElementary data access• Moderate self-descriptionModerate self-description• Geolocation information Geolocation information
tightly coupled to tightly coupled to somesome of the dataof the data
• PartiallyPartially standardized standardized geographical subsettinggeographical subsetting
Services Services NotNot Provided Provided• ECS ingest, archiving, ECS ingest, archiving,
search, and distributionsearch, and distribution• Enhanced self-Enhanced self-
descriptiondescription• FullyFully standardized standardized
geographical subsettinggeographical subsetting
An HDF file with a mixed An HDF file with a mixed set of HDF-EOS and HDF set of HDF-EOS and HDF
data objectsdata objects
HDF-EOS, 1999 HDF-EOS, Ullman Silde 18
Services ProvidedServices Provided• PortabilityPortability• Elementary data accessElementary data access• ECS ingest, archiving, ECS ingest, archiving,
search, and distributionsearch, and distribution• Enhanced self-Enhanced self-
descriptiondescription
Services Services NotNot Provided Provided• Geolocation information Geolocation information
tightly coupled to the tightly coupled to the data data
• Fully standardized Fully standardized geographical subsettinggeographical subsetting
An HDF file with a set ofAn HDF file with a set ofHDF data objects with HDF data objects with
EOSDIS metadataEOSDIS metadata
HDF-EOS, 1999 HDF-EOS, Ullman Silde 19
Services ProvidedServices Provided• PortabilityPortability• Elementary data accessElementary data access• Geolocation information Geolocation information
tightly coupled to the tightly coupled to the data data
• Fully standardized Fully standardized geographical subsettinggeographical subsetting
•ECS ingest, archiving, ECS ingest, archiving, search, and distributionsearch, and distribution
•Enhanced self-descriptionEnhanced self-description
Services Services NotNot Provided Provided•None of the above listed None of the above listed
services.services.
An HDF file with a set of An HDF file with a set of HDF-EOS data objects HDF-EOS data objects with EOSDIS metadatawith EOSDIS metadata
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