{
  "claims": [
    {
      "claim": {
        "claim_id": "claim-emigrant-western-powell-spur-geometry",
        "evidence_ids": [
          "evidence-emigrant-western-powell-spur-geometry"
        ],
        "predicate": "reviewed_route_display_geometry",
        "spatial_scope_ids": [
          "scope-route-emigrant-gianelli-powell-lake"
        ],
        "subject_id": "route-segment-emigrant-western-powell-spur",
        "temporal_scope": null,
        "value": {
          "coordinate_reference_system": "EPSG:4326",
          "current_route_status": "unknown; pre-trip check required",
          "end_coordinate": {
            "latitude": 38.20300733525263,
            "longitude": -119.85834828897434
          },
          "geometry_snapshot": {
            "feature_id": "usfs-emigrant-western-powell-spur",
            "path": "geometry/v0/snapshots/usfs-emigrant-western-routes-20261006.geojson",
            "sha256": "5cca60fe36da261b084bbd7b258964fee57c6b6a4f02edb166dad0acd7bb71ee"
          },
          "navigation_grade": false,
          "route_role": "official_mainline",
          "source_coordinate_accuracy": "unknown",
          "source_feature_id": 9430968,
          "source_globalid": "{C539E29C-748A-4018-821E-D53108F78B61}",
          "source_vertex_range_inclusive": [
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            22
          ],
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            "latitude": 38.201889705060864,
            "longitude": -119.85956900904041
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        }
      },
      "evidence": [
        {
          "claim_id": "claim-emigrant-western-powell-spur-geometry",
          "evidence_id": "evidence-emigrant-western-powell-spur-geometry",
          "notes": "",
          "observation_id": "observation-emigrant-western-powell-spur-geometry",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "USFS National Forest System Trails feature 9430968, globalid {C539E29C-748A-4018-821E-D53108F78B61}, 20E14A POWELL LAKE SPUR: reviewed inclusive normalized source vertices 0 through 22. Matched against official trail maps; source lengths describe the entire original feature. No coordinate is snapped and no mileage is computed.",
          "observation_id": "observation-emigrant-western-powell-spur-geometry",
          "observed_at": null,
          "observer": "Wayproof primary-source text, georeferenced map and named-feature review",
          "retrieved_at": "2026-10-06T00:09:34+00:00",
          "source_id": "source-usfs-emigrant-nfs-trail-geometry"
        }
      ],
      "sources": [
        {
          "locator": "https://apps.fs.usda.gov/arcx/rest/services/EDW/EDW_TrailNFSPublish_01/MapServer/0",
          "publisher": "USDA Forest Service",
          "source_id": "source-usfs-emigrant-nfs-trail-geometry"
        }
      ]
    }
  ],
  "entities": [
    {
      "entity_id": "route-segment-emigrant-western-powell-spur",
      "kind": "route_segment",
      "name": "Powell Spur"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20261006-emigrant-western-coverage",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/observations/observation-emigrant-western-powell-spur-geometry.json",
      "reason": "Add bounded western approach, geometry and facility evidence; retain unresolved planning limits.",
      "record_id": "observation-emigrant-western-powell-spur-geometry",
      "record_type": "observation",
      "summary": "Add six drawable western Emigrant approaches with shared physical segments, lake camping evidence and historical trailhead facilities."
    }
  ],
  "navigation": {
    "next_id": "observation-emigrant-western-powell-spur-topology",
    "position": 810,
    "previous_id": "observation-emigrant-western-powell-mileage-diagram",
    "total": 1318
  },
  "observations": [
    {
      "artifact_refs": [],
      "content": "USFS National Forest System Trails feature 9430968, globalid {C539E29C-748A-4018-821E-D53108F78B61}, 20E14A POWELL LAKE SPUR: reviewed inclusive normalized source vertices 0 through 22. Matched against official trail maps; source lengths describe the entire original feature. No coordinate is snapped and no mileage is computed.",
      "observation_id": "observation-emigrant-western-powell-spur-geometry",
      "observed_at": null,
      "observer": "Wayproof primary-source text, georeferenced map and named-feature review",
      "retrieved_at": "2026-10-06T00:09:34+00:00",
      "source_id": "source-usfs-emigrant-nfs-trail-geometry"
    }
  ],
  "record": {
    "artifact_refs": [],
    "content": "USFS National Forest System Trails feature 9430968, globalid {C539E29C-748A-4018-821E-D53108F78B61}, 20E14A POWELL LAKE SPUR: reviewed inclusive normalized source vertices 0 through 22. Matched against official trail maps; source lengths describe the entire original feature. No coordinate is snapped and no mileage is computed.",
    "observation_id": "observation-emigrant-western-powell-spur-geometry",
    "observed_at": null,
    "observer": "Wayproof primary-source text, georeferenced map and named-feature review",
    "retrieved_at": "2026-10-06T00:09:34+00:00",
    "source_id": "source-usfs-emigrant-nfs-trail-geometry"
  },
  "record_type": "observation",
  "related_records": [],
  "sources": [
    {
      "locator": "https://apps.fs.usda.gov/arcx/rest/services/EDW/EDW_TrailNFSPublish_01/MapServer/0",
      "publisher": "USDA Forest Service",
      "source_id": "source-usfs-emigrant-nfs-trail-geometry"
    }
  ]
}