# TerraFabric Ontology — generated by terrafabric-server
# version 1.0.0

@prefix tf: <https://terrafabric.world/ont#> .
@prefix tfr: <https://terrafabric.world/id/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix prov: <http://www.w3.org/ns/prov#> .
@prefix sosa: <http://www.w3.org/ns/sosa/> .
@prefix ssn: <http://www.w3.org/ns/ssn/> .
@prefix geo: <http://www.opengis.net/ont/geosparql#> .
@prefix schema: <https://schema.org/> .
@prefix odrl: <http://www.w3.org/ns/odrl/2/> .

<https://terrafabric.world/id/collection/nasa-smap-enhanced-brightness-temperature> a tf:PreprocessedCollection ;
    dct:identifier "nasa-smap-enhanced-brightness-temperature" ;
    dct:title "SMAP Enhanced L1C Radiometer Half-Orbit 9 km EASE-Grid Brightness Temperatures V004" ;
    dct:description "Calibrated and geolocated half-orbit SMAP passive L-band brightness temperatures enhanced with Backus-Gilbert interpolation and posted to 9 km EASE-Grid 2.0 global and polar grids. Grid posting is not the radiometer instrument resolution. Brightness temperature is a radiometric quantity rather than physical land temperature or a retrieved soil-moisture measurement. Apply calibration, interference and surface screening; native file geometry is artifact scope rather than every valid sample. NSIDC advisory checked 2026-10-03: SMAP Standard and Near-Real-Time products experienced a geolocation issue from 2026-05-14 through 2026-07-28. Standard products in that interval are being reprocessed; Near-Real-Time products will not be replaced. Consult current publisher guidance and replacement metadata before spatial use." ;
    tf:providedBy <https://terrafabric.world/id/provider/nasa> ;
    tf:dataTier tf:tier-preprocessed ;
    tf:processingLevel tf:level-L1C ;
    tf:accessClass "free" ;
    tf:hasModality tf:modality-microwave ;
    tf:dataCategory tf:category-imagery ;
    tf:hasPlatform <https://terrafabric.world/id/platform/smap> ;
    tf:hasInstrument <https://terrafabric.world/id/instrument/smap-l-band-radiometer> ;
    tf:allWeather false ;
    tf:nightCapable false ;
    tf:taskable false ;
    tf:license <https://terrafabric.world/id/license/provider-terms> ;
    tf:releasability tf:marking-public ;
    dcat:keyword "earth-observation" ;
    dcat:keyword "primary-source" ;
    dcat:keyword "stac" ;
    dcat:keyword "SPL1CTB_E_004" ;
    dcat:keyword "SMAP" ;
    dcat:keyword "passive microwave" ;
    dcat:keyword "9 km grid" ;
    dcat:keyword "half-orbit" ;
    dcat:keyword "geolocation advisory" ;
    dcat:keyword "brightness temperature" ;
    dcat:keyword "calibration" ;
    tf:spatialExtent <https://terrafabric.world/id/collection/nasa-smap-enhanced-brightness-temperature/extent/spatial> ;
    tf:temporalExtent <https://terrafabric.world/id/collection/nasa-smap-enhanced-brightness-temperature/extent/temporal> ;
    tf:format <https://terrafabric.world/id/format/stac> ;
    tf:format <https://terrafabric.world/id/format/hdf5> ;
    tf:accessibleVia <https://terrafabric.world/id/collection/nasa-smap-enhanced-brightness-temperature/access/0> ;
    tf:accessibleVia <https://terrafabric.world/id/collection/nasa-smap-enhanced-brightness-temperature/access/1> ;
    tf:accessibleVia <https://terrafabric.world/id/collection/nasa-smap-enhanced-brightness-temperature/access/2> .

<https://terrafabric.world/id/collection/nasa-smap-enhanced-brightness-temperature/extent/spatial> a tf:SpatialExtent ;
    tf:bbox "-180,-85.044,180,85.044" ;
    tf:asWKT "POLYGON((-180 -85.044,180 -85.044,180 85.044,-180 85.044,-180 -85.044))"^^geo:wktLiteral .

<https://terrafabric.world/id/collection/nasa-smap-enhanced-brightness-temperature/extent/temporal> a tf:TemporalExtent ;
    tf:startDate "2015-03-31"^^xsd:date .

<https://terrafabric.world/id/collection/nasa-smap-enhanced-brightness-temperature/access/0> a tf:AccessMethod ;
    tf:accessKind "https" ;
    tf:endpointURL "https://search.earthdata.nasa.gov/"^^xsd:anyURI .

<https://terrafabric.world/id/collection/nasa-smap-enhanced-brightness-temperature/access/1> a tf:AccessMethod ;
    tf:accessKind "stac-api" ;
    tf:endpointURL "https://cmr.earthdata.nasa.gov/stac/NSIDC_CPRD"^^xsd:anyURI .

<https://terrafabric.world/id/collection/nasa-smap-enhanced-brightness-temperature/access/2> a tf:AccessMethod ;
    tf:accessKind "https" ;
    tf:endpointURL "https://nsidc.org/data/spl1ctb_e/versions/4"^^xsd:anyURI .