Metadata Fields - SMAP Enhanced L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures, Version 1

This page provides a description of all metadata fields within the SMAP Enhanced L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures (SPL1CTB_E). All metadata fields are described in Table 1.

For a description of data fields for this product, refer to the Data Fields document.

Table 1. Description of File-Level Metadata Fields
Representative ISO Class HDF5 Metadata Subgroup HDF5 Subpath HDF5 Subgroup/Attribute Description/Valid Values1
MD_AcquisitionInformation AcquisitionInformation platform antennaRotationRate <The antenna rotation rate in revolution per minute (rpm)>
description The SMAP observatory houses an L-band radiometer that operates at 1.40 GHz and an L-band radar that operates at 1.26 GHz. The instruments share a rotating reflector antenna with a 6 meter aperture that scans over a 1000 km swath. The bus is a 3 axis stabilized spacecraft that provides momentum compensation for the rotating antenna.
identifier SMAP
radar,
radiometer
description The SMAP radar instrument employs an L-band conically scanned system and SAR processing techniques to achieve moderate resolution (1 km) backscatter measurements over a very wide 1000 km swath.
identifier SMAP SAR
type L-band Synthetic Aperture Radar
platformDocument,
radarDocument,
radiometerDocument
edition <The edition of publication of the reference document, if available to the general public>
publicationDate <The date of publication of the reference document, if available to the general public>
title <The title of the publication of the reference document, if available to the general public>
DQ_DataQuality DataQuality DomainConsistency evaluationMethodType <The type of data quality evaluation method; "directInternal" means the method of evaluating the quality of a data set based on inspection of items within the data set, where all data required is internal to the data set being evaluated>
measureDescription <The description of the Domain Consistency measurement>
nameOfMeasure <The name of the measurements>
unitOfMeasure Percent
value <A measure between 0 and 100>
CompletenessOmission evaluationMethodType <The type of data quality evaluation method; "directInternal" means the method of evaluating the quality of a data set based on inspection of items within the data set, where all data required is internal to the data set being evaluated>
measureDescription <The description of the Completeness Omission measurement>
nameOfMeasure Percent of Missing Data
unitOfMeasure Percent
value <A measure between 0 and 100>
scope <A list of data elements of the product, that are used for DataQuality measurement>
DS_dataset/
MD_DataIdentification
datasetIdentification CompositeReleaseID <SMAP Composite Release ID associated with this data product>
ECSVersionID <Identifier that specifies major version delivered to ECS (EOSDIS Core System).  Value runs from 001 to 999>
SMAPShortName <The SMAP Mission product short name of this data product>
UUID <A universally unique identifier for each data granule>
abstract <A short description of this data product>
characterSet utf8
creationDate <Date when this data product file was created>
credit <Identify the institutional authorship of the product generation software and the data system that automates its production>
fileName <The name of this data product file>
language eng
originatorOrganizationName Jet Propulsion Laboratory
otherCitationDetails <The description of the state of the product generation software for this data product file>
purpose <The description of the purpose of this data product file>
shortName <The ECS short name of this data product in 8 characters>
spatialRepresentationType grid
status onGoing
topicCategory geoscientificInformation
EX_Extent Extent description <The description of the spatial and temporal extents of the data product>
eastBoundLongitude <The most eastern boundary of the spatial extent the data product covers (Longitude measure between -180 degrees and 180 degrees)>
northBoundLatitude <The most northern boundary of the spatial extent the data product covers (Latitude measure between -90 degrees and 90 degrees)>
rangeBeginningDateTime <Character string that indicates the date and time of the initial data element in the product>
rangeEndingDateTime <Character string that indicates the date and time of the final data element in the product>
southBoundLatitude <The most southern boundary of the spatial extent the data product covers (Latitude measure between -90 degrees and 90 degrees)>
westBoundLongitude <The most western boundary of the spatial extent the data product covers (Longitude measure between -180 degrees and 180 degrees)>
MD_GridSpatialRepresentation GridSpatialRepresentation GlobalProjection,
NorthPolarProjection,
SouthPolarProjection
cellGeometry <Indication of grid data as point or area>
controlPointAvailability <Indication of whether or not control points are available (0 implies not available and 1 implies available)>
dimensionSize <The size of the dimension of the arrays in this specific projection are organized in this data product file>
georeferencedParameters <The parameters used for the conversion of the geographic location information to the map projection of interest>
numberOfDimensions <The number of dimensions of the arrays in this specific projection are organized in this data product file>
orientationParameterAvailability <Indication of whether or not orientation parameters are available (0 implies not available and 1 implies available)>
resolution <The spatial resolution each data point represents, in kilometer>
transformationParameterAvailability <The indication of whether the parameters for transformation exists or not (0 implies not available and 1 implies available)>
GridDefinitionDocument edition <The version of the grid definition document>
publicationDate <The publication date of the grid definition document>
title <The title of the grid definition document>
GridDefinition description <The description of the grid definition applied for the data product generation>
identifier <The short name identifying the grid definition of this data product>
LI_Lineage/LE_Source Lineage L1B_TB DOI <A digital object identifier associated with the input product.  This field appears only for the Lineage class that describes the SMAP science data product>
creationDate <Date when the corresponding input product file was created>
description <Description of each of the input files used to generate this data product>
fileName <The name of the corresponding input product file>
identifier <The short name associated with the input SMAP science data product>
resolution <The spatial resolution each data point represents, in kilometer>
version <The SMAP Composite Version ID associated with the input data product>
EASEGRID_LAT_M,
InputConfiguration,
MetadataConfiguration,
OutputConfiguration,
RunConfiguration
creationDate <Date when the corresponding ancillary input file was created>
description <Description of each ancillary input file used to generate this data product>
fileName <The name of the ancillary input file>
version <The version number of the ancillary input file>
SD_OrbitMeasuredLocation OrbitMeasuredLocation argumentOfPerigee <The angle in the orbit plane of SMAP satellite between the point of perigee and ascending node. The angle is measured in the direction of spacecraft motion>
cycleNumber <The SMAP satellite flies in a cycle that repeats after 117 orbits. This element specifies the cycle of orbits when the data were taken. First cycle is assigned the number 1>
eccentricity <The eccentricity of the satellite orbit>
epoch <The effective time of the data in the OrbitMeasuredLocation class. This may be identical to the equatorCrossingDateTime>
equatorCrossingDateTime <A time stamp that specifies the date and time of ascending node crossing for the current orbit>
equatorCrossingLongitude <The longitude of the ascending node crossing for the current orbit>
halfOrbitStartDateTime <A time stamp that specifies the date and time of the instant the spacecraft crosses either the southernmost point or the northernmost point in its path, marking the beginning of the half orbit>
halfOrbitStopDateTime <A time stamp that specifies the date and time of the instant the spacecraft crosses either the southernmost point or the northernmost point in its path, marking the end of the half orbit>
inclination <The angle between the orbital plane of the spacecraft and the equatorial plane of the Earth. An angle greater than 90 degrees indicates a orbit retrograde path>
meanMotion <The constant angular speed that would be required for a body travelling in an undisturbed elliptical orbit with the specified semimajor axis to complete one revolution in the actual orbital period, expressed as a number of revolutions per day>
orbitDirection <SMAP Level 1 and Level 2 products appear in half orbit granules. This element provides direction of orbital path relative to equatorial plane. Values are "ascending" or "descending".>
orbitPathNumber <The SMAP satellite flies in a cycle the repeats after 117 orbits. This element specifies which of the 117 possible paths the spacecraft flew when the data in the file were acquired. The orbitPathNumber varies from 1 to 117.>
orbitPeriod <Time required to complete a the spacecraft orbit>
referenceCRS <A description of the coordinate reference system used to describe spacecraft orbital data>
revNumber <The count of orbits from beginning of mission to the orbit that the spacecraft flew when the data in the file were acquired. Orbit zero begins at launch and extends until the spacecraft crosses the southernmost point in its path for the first time. Orbit one commences at that instant.>
rightAscensionAscendingNode <The angle eastward on the equatorial plan from the vernal equinox to the orbit ascending node>
semiMajorAxis <The length of the semi-major axis of the spacecraft orbit>
LI_Lineage/LE_ProcessStep ProcessStep ATBDDate <Time stamp that specifies the release date of the ATBD>
ATBDTitle <The title of the ATBD>
ATBDVersion <Version identifier for the ATBD>
SWVersionID <A software version identifier that runs from 001 to 999>
algorithmDate <Date associated with current version of the algorithm>
algorithmDescription <Descriptive text about the algorithm(s) in the product generation software for this data product>
algorithmSelection <The algorithm(s) applied to generate this data product>
algorithmTitle <The representative name of the algorithm for this data product>
algorithmVersionID <Identifier that specifies the current algorithm version. Value runs from 001 to 999>
documentDate <Release date for the software description document>
documentVersion <Version identifier for the software description document>
documentation <A reference to software description document>
epochJulianDate <Julian Date of the Epoch J2000, 2451545>
epochUTCDateTime <UTC Date Time of the Epoch J2000, 2000-01-01T11:58:55.816Z>
identifier <Name of the product generation software for this data product>
parameterVersionID <Identifier that specifies the current version of processing parameters. Value runs from 001 to 999>
processDescription <Short description of the data processing concept by the product generation software>
processor <Name of the product generation facility>
softwareDate <A date stamp that specifies when software used to generate this product was released>
softwareTitle <The title of the product generation facility>
stepDateTime < A character string that specifies the date and the time when the product was generated>
timeVariableEpoch <The Epoch of the time variable for the SMAP mission>
DS_Series/MD_DataIdentification ProductSpecificationDocument SMAPShortName <The SMAP Mission product short name of this data product>
characterSet utf8
edition <Edition identifier for the Product Specification Document>
language eng
publicationDate <Date of publication of the Product Specification Document>
title <The title of the product specification document>
DQ_DataQuality QA MissingSamples <The number of samples missing in this data products>
OutOfBoundsSamples <The number of samples that are exceeding the predefined boundary>
QAPercentOutOfBoundsData <Percent of the samples that are exceeding the predefined boundary with respect tot the total samples in this data product>
TotalSamples <The number of all samples in this data product>
DS_dataset/MD_DataIdentification QAdatasetIdentification abstract An ASCII product that contains statistical information on data product results. These statistics enable data producers and users to assess the quality of the data in the data product granule.
creationDate <The date that the QA product was generated>
fileName <The name of QA product>
DS_Series/MD_DataIdentification SeriesIdentification CompositeReleaseID <SMAP Composite Release ID that identifies the release used to generate this data product>
ECSVersionID <Identifier that specifies major version delivered to ECS. Value runs from 001 to 999>
abstract <A short description of this data product series>
characterSet utf8
credit <Identify the institutional authorship of the product generation software and the data system that automates its production>
format HDF5
formatVersion <The version of the HDF5 library used for the product generation>
identifier_product_DOI <digital object identifier for the Level 1C S0 HiRes Product>
language eng
longName <The long name of this data product (up to 80 characters long)>
maintenanceAndUpdateFrequency As needed
maintenanceDate <Specifies a date when the next update to this product might be anticipated>
mission Soil Moisture Active Passive (SMAP)
otherCitationDetails <The description of the state of the product generation software for this data product file>
pointOfContact <The name of the DAAC this data product is distributed from>
purpose <The description of the purpose of this data product file>
resourceProviderOrganizationName National Aeronautics and Space Administration
revisionDate <Date and time of the software release that was used to generate this data product>
shortName <The ECS short name of this data product in 8 characters>
spatialRepresentationType grid
status Ongoing
topicCategory geoscientificInformation
1 Brackets indicate a description of potential valid values, not an absolute value. For example, valid values for the Subgroup algorithmVersionID range from 001 to 999, which is indicated by the following description: <An algorithm version identifier that runs from 001 to 999>