what is hdf-eos? information compiled from hdf-eos workshop ii hdf-eos workshop iii, 1999

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.


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


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 Point

• No presently defined data sets from Landsat or Terra instruments.

• Likely use in validation campaigns.


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


“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 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 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 GridXdimSize: 2000

YdimSize: 800

Projinfo

AltitudeSize 30


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 Grid

• 128 HDF-EOS Grid Products are defined for distribution from EOSDIS after Terra launch.

• ASTER, CERES, ECS Ancillary, MISR, MODIS, MOPITT


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.


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


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


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


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


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,


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


Services ProvidedServices Provided• PortabilityPortability• Elementary data accessElementary data access• ECS ingest, archiving, ECS ingest, archiving,


descriptiondescription

Services Services NotNot Provided Provided• Geolocation information Geolocation information

tightly coupled to the tightly coupled to the data data


An HDF file with a set ofAn HDF file with a set ofHDF data objects with HDF data objects with

EOSDIS metadataEOSDIS metadata


Services ProvidedServices Provided• PortabilityPortability• Elementary data accessElementary data access• Geolocation information Geolocation information

tightly coupled to the tightly coupled to the data data


•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

what is hdf-eos? information compiled from hdf-eos workshop ii hdf-eos workshop iii, 1999

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