Metadata Fields - SMAP L4 Global Daily 9 km Carbon Net Ecosystem Exchange

This page provides a description of all metadata fields within the SMAP L4 Global Daily 9 km Carbon Net Ecosystem Exchange (SPL4CMDL) data set. All metadata fields are described in Table 1.

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

Table 1. Description of File Level Metadata Fields
ISO Major Class SMAP HDF5 Metadata SubGroup Subgroup/Attribute in SMAP HDF5 Valid Values1
DQ_DataQuality DataQuality/L4_C Scope nee
CompletenessOmission/eva luationMethodType directInternal
CompletenessOmission/me asureDescription Percent of land grid cells (excluding inland water, barren areas and permanent ice) that lack NEE data relative to the total number of land grid cells that fall within the global domain (excluding inland water, barren areas and permanent ice).
CompletenessOmission/na meOfMeasure Percent of Missing Data
CompletenessOmission/val ue <A measure between 0 and 100>
CompletenessOmission/unit OfMeasure Percent
DomainConsistency/evaluati onMethodType directInternal
DomainConsistency/measur eDescription Percent of L4_C modeled data that fall within a predefined acceptable range of measure.
DomainConsistency/nameO fMeasure Percent of L4_C modeled data that are within the acceptable range.
DomainConsistency/value <A measure between 0 and 100>
DomainConsistency/unitOf Measure Percent
EX_Extent Extent description Global land excluding inland water and permanent ice.
westBoundLongitude -180 degrees
eastBoundLongitude 180 degrees
southBoundLatitude -85.04456 degrees
northBoundLatitude 85.04456 degrees
rangeBeginningDateTime <Time stamp that indicates the initial time element in the product.>
rangeEndingDateTime <Time stamp that indicates the final time of data in the product.>
LI_Lineage/LE_ProcessStep ProcessStep processor Soil Moisture Active Passive (SMAP) Mission Science Data System (SDS) Operations Facility
stepDateTime <A date time stamp that specifies when the processing of the data product took place.>
processDescription L4_C models FPAR 8-DAY composite, GEOS5-FP, and SMAP L4_SM and L3_SM_A data within a global carbon model to generate spatially complete and temporally continuous estimates of NEE (net ecosystem exchange), GPP, Rh, SOC and associated ecosystem variables at 9- km.
documentation <Software description document title, version, and date stamp.>
identifier L4_C_SPS
runTimeParameters <Specify any run time parameters if they were used.>
SWVersionID <A software version identifier that runs from 001 to 999>
softwareDate <A date stamp that specifies when software used to generate this product was released.>
softwareTitle Level 4 Surface and Root Zone Soil Moisture SPS
timeVariableEpoch J2000
epochJulianDate 2451545.00
epochUTCDate 2000-01-01T11:58:55.816Z
ATBDTitle Soil Moisture Active Passive (SMAP) Level 4 Carbon (L4_C) Algorithm Theoretical Basis Document (ATBD)
ATBDDate <Time stamp that specifies the release date of the ATBD>
ATBDVersion <Latest ATBD version number.>
algorithmDescription The SMAP L4_C global daily algorithm provides spatially and temporally complete net ecosystem exchange (NEE), gross primary productivity (GPP), heterotrophic respiration (Rh), Soil Organic Carbon (SOC), and related variables at 9-km for science and applications users.
algorithmVersionID <An algorithm version identifier that runs from 001 to 999>
version <The SMAP Composite Release ID(s) of the input data product(s).>
identifier SPL2SMDL
DOI <Digital object identifier(s) of the input data product(s), if available.>
Source/L4_SM description The surface meteorological data from L4_SM algorithm.
fileName <Complete file name(s) of the input data product.>
creationDate <Date stamp(s) of the input data product(s).>
version <Version ID(s) of the input data product(s).>
identifier <Short name(s) of the input data product(s).>
DOI <Digital object identifier(s) of the input data product(s), if available.>
Source/MODIS FPAR 8-DAY Description MODIS FPAR 8-day (MOD15A2)
filename <Complete file name(s) of the input data product.>
creationDate <Date stamp(s) of the input data product(s).>
Version <Version ID(s) of the input data product(s).>
Identifier <Short name(s) of the input data product(s).>
DOI <Digital object identifier(s) of the input data product(s), if available.>
Source/L4_C_MET Description L4_C MET Pre-processor output (L4CMET) to daily L4_C model
Filename <Complete file name(s) of the input data product.>
creationDate <Date stamp(s) of the input data product(s).>
Version <Version ID(s) of the input data product(s).>
Identifier <Short name(s) of the input data product(s).>
DOI <Digital object identifier(s) of the input data product(s), if available.>
Source/L4_C_MODIS Description L4_C MODIS Pre-processor output (L4CMOD) to daily L4_C model
Filename <Complete file name(s) of the input data product.>
creationDate <Date stamp(s) of the input data product(s).>
Version <Version ID(s) of the input data product(s).>
Identifier <Short name(s) of the input data product(s).>
DOI <Digital object identifier(s) of the input data product(s), if available.>
Source/L4_C_SOC Description L4_C Soil Organic Carbon (SOC) daily intermediate variables updated daily by L4_C model
Filename <Complete file name(s) of the input data product.>
creationDate <Date stamp(s) of the input data product(s).>
Version <Version ID(s) of the input data product(s).>
Identifier <Short name(s) of the input data product(s).>
DOI <Digital object identifier(s) of the input data product(s), if available.>
Source/L4_C_NDVI Description L4_C VIIRs NDVI backup source for calculating FPAR
Filename <Complete file name(s) of the input data product.>
creationDate <Date stamp(s) of the input data product(s).>
Version <Version ID(s) of the input data product(s).>
Identifier <Short name(s) of the input data product(s).>
DOI <Digital object identifier(s) of the input data product(s), if available.>
Source/L4_C FPAR Climatology Description L4_C FPAR 365-day climatology as backup FPAR source for daily L4_C model
Filename <Complete file name(s) of the input data product.>
creationDate <Date stamp(s) of the input data product(s).>
Version <Version ID(s) of the input data product(s).>
Identifier <Short name(s) of the input data product(s).>
DOI <Digital object identifier(s) of the input data product(s), if available.>
Source/GEOS5_FP description The observation-corrected surface meteorological data from the NASA GEOS-5 system. Precipitation corrected using the gauge-based NOAA Climate Prediction Center Unified precipitation product.
fileName <Complete file name(s) of the input data product.>
creationDate <Date stamp(s) of the input data product(s).>
version <Version ID(s) of the input data product(s).>
identifier <Short name(s) of the input data product(s).>
DOI <Digital object identifier(s) of the input data product(s), if available.>
DS_Dataset/MD_DataIdentification DatasetIdentification creationDate <Date when the L4_C data product file was created>
VersionID <SMAP Science Version ID associated with this data product – See section (4.3) of the L4_C Product Specification Document.>
CompositeReleaseID <SMAP Composite Release ID (CRID) associated with this data product. The CRID is the 4 digit Science Version ID shown in the filename with an additional four-digit unique appendix. – See Section 4.3 of this document and Section 4.3 of the L4_SM Product Specification Document.>
ECSVersionID <Three-character string that identifies the type of ECS data stream and reflects the major science version of the product, for example: "001" = first operational processing stream; "002" = second operational processing stream (supersedes first stream after major algorithm update and includes reprocessing); "003" = third operational processing stream (supersedes second stream…); "199" = candidate operational stream (a.k.a. OASIS or parallel processing stream) > 
UUID <Universally Unique identifier (36- character string)>
fileName <Name of the L4_C output data file.>
originatorOrganizationName NTSG group at the University of Montana, Missoula, Montana, USA
longName SMAP Level 4 Carbon <Collection ID> Collection
shortName <ECS Short Name>
SMAPShortName L4_C <Collection ID> Collection
abstract The SMAP L4_C data product provides global, daily net ecosystem exchange, GPP and related variables 9 km resolution. The L4_CM data product consists of one Collection of data granules (or files): the model (MDL) data Collection (shortName=SPL4SMDL).
characterSet utf8
credit The software that generates the L4_C data product and the data system that automates its production were designed and implemented at the NTSG group at the University of Montana, Missoula, Montana, USA.
language eng
purpose The SMAP L4_C data product provides spatially and temporally complete net ecosystem exchange, GPP, Rh, Soil Organic Carbon and related variables for science and applications users.
status "on-going" ("completed" after final reprocessing)
topicCategoryCode geoscientificInformation
QACreationDate <The generation date of the QA product that accompanies the L4_C data granule.>
QAFileName <The name of QA product.>
QAAbstract An HDF5 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.
DS_Series/MD_Data Identification SeriesIdentification revisionDate <Date and time of the software release that was used to generate this data product.>
VersionID <SMAP Science Version ID associated with this data product – See section 4.3 of the L4_C Product Specification Document.>
CompositeReleaseID < SMAP Composite Release ID (CRID) associated with this data product. The CRID is the 4 digit Science Version ID shown in the filename with an additional four-digit unique appendix. – See Section 4.3 of this document and Section 4.3 of the L4_SM Product Specification Document.>
ECSVersionID <Three-character string that identifies the type of ECS data stream and reflects the major science version of the product, for example: "001" = first operational processing stream; "002" = second operational processing stream (supersedes first stream after major algorithm update and includes reprocessing); "003" = third operational processing stream (supersedes second stream…); "199" = candidate operational stream (a.k.a. OASIS or parallel processing stream) > 
longName SMAP Level 4 Carbon <Collection ID> Collection
shortName < ECS Short Name>
identifier_product_DOI <digital object identifier>
resourceProviderOrganizati onName National Aeronautics and Space Administration
abstract The SMAP L4_C data product provides global, daily net ecosystem exchange, GPP and related variables 9 km resolution. The L4_CM data product consists of one Collection of data granules (or files): the model (MDL) data Collection (shortName=SPL4SMDL).
characterSet utf8
credit The software that generates the L4_C data product and the data system that automates its production were designed and implemented at the NTSG group at the University of Montana,  Maryland, USA.
language Eng
purpose The SMAP L4_C data product provides spatially and temporally complete net ecosystem exchange, GPP, Rh, Soil Organic Carbon and related variables for science and applications users.
status "on-going" ("completed" after final reprocessing)
topicCategoryCode geoscientificInformation
pointOfContact NTSG group at the University of Montana, Missoula, Montana, and the National Snow and Ice Data Center, Boulder, Colorado, USA.
PSDPublicationDate <Date of publication of the Product Specification Document>
PSDEdition <Edition identifier for the Product Specification Document>
PSDTtitle Soil Moisture Active Passive Mission Level 4 Carbon (L4_C) Product Specification Document
SMAPShortName L4_C
mission Soil Moisture Active Passive (SMAP)
maintenanceAndUpdateFre quency asNeeded
maintenanceDate <Specifies a date when the next update to this product might be anticipated.>
format HDF5
formatVersion <HDF5 version number>
MD_GridSpatialRepres entation GridSpatialRepresent ation Latitude/dimensionSize 1624
Latitude/resolution 9 km on average
Longitude/dimensionSize 3856
Longitude/resolution 9 km on average
MD_AcquisitionInformation AcquisitionInformation platform/antennaRotationRa te <Antenna rotation rate in rpm>
platformDocument/publicati onDate <The date of publication of the document that describes the SMAP platform, if available to the general public.>
platformDocument/edition <The edition of publication of the document that describes the SMAP platform, if available to the general public.>
platformDocument/title <The title of the publication of the document that describes the SMAP platform, if available to the general public.>
platform/description The SMAP observatory houses an L-band radiometer that operates at 1.4 GHz and an L-band radar that operates at 1.26-1.29 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.
platform/identifier SMAP
radarDocument/publication Date <The date of publication of the document that describes the SMAP radar instrument, if available to the general public.>
radarDocument/edition <The edition of publication of the document that describes the SMAP radar instrument, if available to the general public.>
radarDocument/title <The title of the publication of the document that describes the SMAP radar instrument, if available to the general public.>
radar/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.
radar/identifier SMAP SAR
radar/type L-band Synthetic Aperture Radar
radiometerDocument/public ationDate <The date of publication of the document that describes the SMAP radiometer instrument, if available to the general public.>
radiometerDocument/edition <The edition of publication of the document that describes the SMAP radiometer instrument, if available to the general public.>
radiometerDocument/title <The title of the publication of the document that describes the SMAP radiometer instrument, if available to the general public.>
radiometer/description The SMAP L-band Radiometer records V- pol, H-pol, 3rd and 4th Stokes brightness temperatures at 40 km resolution at 4.3 Megatbits per second with accuracies of 1.3 Kelvin or better.
radiometer/identifier SMAP RAD
radiometer/type L-band Radiometer
1Brackets 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>