# 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/uscg-gps-almanacs> a tf:DataProductCollection ;
    dct:identifier "uscg-gps-almanacs" ;
    dct:title "GPS Almanacs and Operational Advisories" ;
    dct:description "Published GPS almanacs and satellite health information for PNT context. Almanacs are approximate orbit parameters, not precision ephemerides." ;
    tf:providedBy <https://terrafabric.world/id/provider/uscg> ;
    tf:dataTier tf:tier-product ;
    tf:processingLevel tf:level-L4 ;
    tf:accessClass "free" ;
    tf:hasModality tf:modality-gnss ;
    tf:hasModality tf:modality-orbital ;
    tf:dataCategory tf:category-places ;
    tf:hasPlatform <https://terrafabric.world/id/platform/gps-constellation> ;
    tf:hasInstrument <https://terrafabric.world/id/instrument/published-navigation-almanacs> ;
    tf:allWeather false ;
    tf:nightCapable false ;
    tf:taskable false ;
    tf:license <https://terrafabric.world/id/license/us-public-domain> ;
    tf:releasability tf:marking-public ;
    dcat:keyword "space" ;
    dcat:keyword "electromagnetic" ;
    dcat:keyword "navigation" ;
    tf:spatialExtent <https://terrafabric.world/id/collection/uscg-gps-almanacs/extent/spatial> ;
    tf:temporalExtent <https://terrafabric.world/id/collection/uscg-gps-almanacs/extent/temporal> ;
    tf:format <https://terrafabric.world/id/format/sem> ;
    tf:format <https://terrafabric.world/id/format/yuma> ;
    tf:accessibleVia <https://terrafabric.world/id/collection/uscg-gps-almanacs/access/0> .

<https://terrafabric.world/id/collection/uscg-gps-almanacs/extent/spatial> a tf:SpatialExtent ;
    tf:bbox "-180,-90,180,90" ;
    tf:asWKT "POLYGON((-180 -90,180 -90,180 90,-180 90,-180 -90))"^^geo:wktLiteral .

<https://terrafabric.world/id/collection/uscg-gps-almanacs/extent/temporal> a tf:TemporalExtent ;
    tf:startDate "2026-09-29"^^xsd:date .

<https://terrafabric.world/id/collection/uscg-gps-almanacs/access/0> a tf:AccessMethod ;
    tf:accessKind "https" ;
    tf:endpointURL "https://www.navcen.uscg.gov/gps-nanus-almanacs-opsadvisories-sof"^^xsd:anyURI .