{ "claims": [ { "claim": { "claim_id": "claim-route-segment-brokeoff-trailhead-summit", "evidence_ids": [ "evidence-route-segment-brokeoff-trailhead-summit" ], "predicate": "official_dataset_route_segment", "spatial_scope_ids": [], "subject_id": "route-segment-brokeoff-trailhead-summit", "temporal_scope": null, "value": { "coordinate_reference_system": "EPSG:4269", "dataset_feature_id": "c128bf58-c8ed-4821-9955-5fba72c87998", "dataset_feature_name": "Brokeoff Mountain Trail", "dataset_field": "lengthmiles", "distance_miles": 3.60834485, "distance_status": "known", "end_coordinate": { "latitude": 40.4456411, "longitude": -121.5595943 }, "operational_status_requires_current_check": true, "route_role": "official_mainline", "source_data_description": "NPS Trails 11/2019", "source_load_date": "2022-01-14T10:16:12.000", "source_mode_attributes": { "bicycle": "No", "hiker_pedestrian": "Yes", "pack_saddle": "Yes" }, "source_originator": "National Park Service", "start_coordinate": { "latitude": 40.4309029, "longitude": -121.5361309 } } }, "evidence": [ { "claim_id": "claim-route-segment-brokeoff-trailhead-summit", "evidence_id": "evidence-route-segment-brokeoff-trailhead-summit", "notes": "", "observation_id": "observation-usgs-topo-vector-lassen-trails-20250729-20260923", "stance": "supports" } ], "observations": [ { "artifact_refs": [], "content": "The USGS Topo Map Vector Data product 25034 Lassen Peak CA, published 2025-07-29 in EPSG:4269, includes NPS-originated recreational-trail features. 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