{
  "answerability": "evidence_backed_claims_available",
  "claims": [
    {
      "claim": {
        "claim_id": "claim-ohlone-lichen-bark-start-area",
        "evidence_ids": [
          "evidence-ohlone-lichen-bark-start-area"
        ],
        "predicate": "official_route_start_area",
        "spatial_scope_ids": [
          "scope-ohlone-wilderness-trail"
        ],
        "subject_id": "trailhead-ohlone-lichen-bark",
        "temporal_scope": {
          "ends_on": null,
          "starts_on": "2025-08-01"
        },
        "value": {
          "first_numbered_post": "route-node-ohlone-ot40",
          "nearby_mapped_drinking_water": true,
          "nearby_mapped_restroom": true,
          "parking": true,
          "printed_distance_to_first_numbered_post_miles": 0.91
        }
      },
      "evidence": [
        {
          "claim_id": "claim-ohlone-lichen-bark-start-area",
          "evidence_id": "evidence-ohlone-lichen-bark-start-area",
          "notes": "Official map evidence for route start, parking, and mapped facilities.",
          "observation_id": "observation-ohlone-map-route-graph-pilot",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The official Ohlone Wilderness Permit Map marks the red hikers-and-horses-only Ohlone route, numbered posts OT26 through OT35, and the Lichen Bark start area. It prints 0.91 mile from Lichen Bark to OT40; mainline distances of 0.37, 0.16, 0.22+0.21+0.35, 0.28, 0.99, 0.91, 0.52, 0.35, and 0.83 mile between OT26 and OT35; a Maggie's Half Acre parallel route of 0.05+0.84 mile between OT27 and OT29; a Stewart's Camp parallel route of 0.60+0.46+0.61+0.28 mile between OT33 and OT35; and a 0.16-mile one-way spur from OT26 to Doe Canyon Horse Camp. The map places water and restrooms at Lichen Bark and shows camp/facility access on the alternate routes. Distances are transcribed from printed tick labels; sums are derived and do not replace the printed components. A second map-faithful pass preserves all 39 individual mileage labels printed on the red official mainline outside the detailed OT26-OT35 slice, ordered from Stanford Avenue toward Lichen Bark. Each printed value is now assigned to an atomic leg bounded by a numbered post or an explicit intermediate mileage-tick node; two mapped consecutive-post connectors have no printed distance.",
          "observation_id": "observation-ohlone-map-route-graph-pilot",
          "observed_at": null,
          "observer": "",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-ohlone-wilderness-map-2025-08"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/sites/default/files/Ohlone-Wilderness-Permit-Map-11x17.pdf",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-ohlone-wilderness-map-2025-08"
        }
      ],
      "subject": {
        "entity_id": "trailhead-ohlone-lichen-bark",
        "kind": "trailhead",
        "name": "Lichen Bark Ohlone Trailhead"
      }
    },
    {
      "claim": {
        "claim_id": "claim-google-maps-ohlone-lichen-bark-start-coordinate",
        "evidence_ids": [
          "evidence-google-maps-ohlone-lichen-bark-360"
        ],
        "predicate": "third_party_start_coordinate",
        "spatial_scope_ids": [
          "scope-ohlone-wilderness-trail"
        ],
        "subject_id": "trailhead-ohlone-lichen-bark",
        "temporal_scope": null,
        "value": {
          "imagery_month": "2015-03",
          "latitude": 37.5787566,
          "longitude": -121.6974062,
          "provenance_class": "user_supplied_google_maps_360"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-google-maps-ohlone-lichen-bark-start-coordinate",
          "evidence_id": "evidence-google-maps-ohlone-lichen-bark-360",
          "notes": "Third-party imagery coordinate; not a surveyed EBRPD coordinate.",
          "observation_id": "observation-google-maps-ohlone-lichen-bark-360",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The user-supplied Google Maps 360 link resolves to contributor imagery at 37.5787566, -121.6974062 near the Lichen Bark parking and path complex. Google labels the imagery March 2015. This is a practical third-party start coordinate, not an EBRPD survey point and not evidence of current facility operation.",
          "observation_id": "observation-google-maps-ohlone-lichen-bark-360",
          "observed_at": "2015-03-01T00:00:00+00:00",
          "observer": "Google Maps contributor imagery supplied by user",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-google-maps-ohlone-lichen-bark-360"
        }
      ],
      "sources": [
        {
          "locator": "https://maps.app.goo.gl/imRm3GCJrx8g9T6r6",
          "publisher": "Google Maps contributor imagery",
          "source_id": "source-google-maps-ohlone-lichen-bark-360"
        }
      ],
      "subject": {
        "entity_id": "trailhead-ohlone-lichen-bark",
        "kind": "trailhead",
        "name": "Lichen Bark Ohlone Trailhead"
      }
    }
  ],
  "entity": {
    "entity_id": "trailhead-ohlone-lichen-bark",
    "kind": "trailhead",
    "name": "Lichen Bark Ohlone Trailhead"
  },
  "gap_details": [
    {
      "claims": [
        {
          "claim": {
            "claim_id": "claim-ohlone-lichen-bark-start-area",
            "evidence_ids": [
              "evidence-ohlone-lichen-bark-start-area"
            ],
            "predicate": "official_route_start_area",
            "spatial_scope_ids": [
              "scope-ohlone-wilderness-trail"
            ],
            "subject_id": "trailhead-ohlone-lichen-bark",
            "temporal_scope": {
              "ends_on": null,
              "starts_on": "2025-08-01"
            },
            "value": {
              "first_numbered_post": "route-node-ohlone-ot40",
              "nearby_mapped_drinking_water": true,
              "nearby_mapped_restroom": true,
              "parking": true,
              "printed_distance_to_first_numbered_post_miles": 0.91
            }
          },
          "evidence": [
            {
              "claim_id": "claim-ohlone-lichen-bark-start-area",
              "evidence_id": "evidence-ohlone-lichen-bark-start-area",
              "notes": "Official map evidence for route start, parking, and mapped facilities.",
              "observation_id": "observation-ohlone-map-route-graph-pilot",
              "stance": "supports"
            }
          ],
          "observations": [
            {
              "artifact_refs": [],
              "content": "The official Ohlone Wilderness Permit Map marks the red hikers-and-horses-only Ohlone route, numbered posts OT26 through OT35, and the Lichen Bark start area. It prints 0.91 mile from Lichen Bark to OT40; mainline distances of 0.37, 0.16, 0.22+0.21+0.35, 0.28, 0.99, 0.91, 0.52, 0.35, and 0.83 mile between OT26 and OT35; a Maggie's Half Acre parallel route of 0.05+0.84 mile between OT27 and OT29; a Stewart's Camp parallel route of 0.60+0.46+0.61+0.28 mile between OT33 and OT35; and a 0.16-mile one-way spur from OT26 to Doe Canyon Horse Camp. The map places water and restrooms at Lichen Bark and shows camp/facility access on the alternate routes. Distances are transcribed from printed tick labels; sums are derived and do not replace the printed components. A second map-faithful pass preserves all 39 individual mileage labels printed on the red official mainline outside the detailed OT26-OT35 slice, ordered from Stanford Avenue toward Lichen Bark. Each printed value is now assigned to an atomic leg bounded by a numbered post or an explicit intermediate mileage-tick node; two mapped consecutive-post connectors have no printed distance.",
              "observation_id": "observation-ohlone-map-route-graph-pilot",
              "observed_at": null,
              "observer": "",
              "retrieved_at": "2026-09-20T00:00:00+00:00",
              "source_id": "source-ebrpd-ohlone-wilderness-map-2025-08"
            }
          ],
          "sources": [
            {
              "locator": "https://www.ebparks.org/sites/default/files/Ohlone-Wilderness-Permit-Map-11x17.pdf",
              "publisher": "East Bay Regional Park District",
              "source_id": "source-ebrpd-ohlone-wilderness-map-2025-08"
            }
          ]
        }
      ],
      "entities": [
        {
          "entity_id": "trailhead-ohlone-lichen-bark",
          "kind": "trailhead",
          "name": "Lichen Bark Ohlone Trailhead"
        },
        {
          "entity_id": "water-del-valle-lichen-bark",
          "kind": "water_source",
          "name": "Lichen Bark drinking water"
        }
      ],
      "history": [
        {
          "action": "ADD",
          "change_set_id": "wp-20260920-ohlone-route-graph-pilot",
          "evidence_refs": [],
          "knowledge_gap_refs": [],
          "path": "canonical/v0/gaps/gap-ohlone-lichen-bark-water-current-status.json",
          "reason": "Publish a source-grounded route-graph pilot with official mainline, alternate routes, facility access, printed mileage, derived detours, and explicit gaps.",
          "record_id": "gap-ohlone-lichen-bark-water-current-status",
          "record_type": "gap",
          "summary": "Add an Ohlone route-graph pilot for Lichen Bark and OT26-OT35, including official and alternate segments, facilities, printed mileage, derived detours, and explicit completeness/current-status gaps."
        }
      ],
      "navigation": {
        "next_id": "gap-reinhardt-redwood-group-camp-capacities",
        "position": 238,
        "previous_id": "gap-ohlone-doe-water-exact-coordinate",
        "total": 299
      },
      "observations": [
        {
          "artifact_refs": [],
          "content": "The official Ohlone Wilderness Permit Map marks the red hikers-and-horses-only Ohlone route, numbered posts OT26 through OT35, and the Lichen Bark start area. It prints 0.91 mile from Lichen Bark to OT40; mainline distances of 0.37, 0.16, 0.22+0.21+0.35, 0.28, 0.99, 0.91, 0.52, 0.35, and 0.83 mile between OT26 and OT35; a Maggie's Half Acre parallel route of 0.05+0.84 mile between OT27 and OT29; a Stewart's Camp parallel route of 0.60+0.46+0.61+0.28 mile between OT33 and OT35; and a 0.16-mile one-way spur from OT26 to Doe Canyon Horse Camp. The map places water and restrooms at Lichen Bark and shows camp/facility access on the alternate routes. Distances are transcribed from printed tick labels; sums are derived and do not replace the printed components. A second map-faithful pass preserves all 39 individual mileage labels printed on the red official mainline outside the detailed OT26-OT35 slice, ordered from Stanford Avenue toward Lichen Bark. Each printed value is now assigned to an atomic leg bounded by a numbered post or an explicit intermediate mileage-tick node; two mapped consecutive-post connectors have no printed distance.",
          "observation_id": "observation-ohlone-map-route-graph-pilot",
          "observed_at": null,
          "observer": "",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-ohlone-wilderness-map-2025-08"
        }
      ],
      "record": {
        "gap_id": "gap-ohlone-lichen-bark-water-current-status",
        "question": "Is the mapped Lichen Bark drinking-water facility currently operating?",
        "reason": "The official map establishes facility presence, while the 2015 imagery does not establish current operation; recheck before travel.",
        "related_ids": [
          "trailhead-ohlone-lichen-bark",
          "water-del-valle-lichen-bark",
          "claim-ohlone-lichen-bark-start-area"
        ]
      },
      "record_type": "gap",
      "related_records": [
        {
          "record": {
            "entity_id": "trailhead-ohlone-lichen-bark",
            "kind": "trailhead",
            "name": "Lichen Bark Ohlone Trailhead"
          },
          "record_id": "trailhead-ohlone-lichen-bark",
          "record_type": "entity"
        },
        {
          "record": {
            "entity_id": "water-del-valle-lichen-bark",
            "kind": "water_source",
            "name": "Lichen Bark drinking water"
          },
          "record_id": "water-del-valle-lichen-bark",
          "record_type": "entity"
        },
        {
          "record": {
            "claim_id": "claim-ohlone-lichen-bark-start-area",
            "evidence_ids": [
              "evidence-ohlone-lichen-bark-start-area"
            ],
            "predicate": "official_route_start_area",
            "spatial_scope_ids": [
              "scope-ohlone-wilderness-trail"
            ],
            "subject_id": "trailhead-ohlone-lichen-bark",
            "temporal_scope": {
              "ends_on": null,
              "starts_on": "2025-08-01"
            },
            "value": {
              "first_numbered_post": "route-node-ohlone-ot40",
              "nearby_mapped_drinking_water": true,
              "nearby_mapped_restroom": true,
              "parking": true,
              "printed_distance_to_first_numbered_post_miles": 0.91
            }
          },
          "record_id": "claim-ohlone-lichen-bark-start-area",
          "record_type": "claim"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/sites/default/files/Ohlone-Wilderness-Permit-Map-11x17.pdf",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-ohlone-wilderness-map-2025-08"
        }
      ]
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ohlone-route-graph-pilot",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/entities/trailhead-ohlone-lichen-bark.json",
      "reason": "Publish a source-grounded route-graph pilot with official mainline, alternate routes, facility access, printed mileage, derived detours, and explicit gaps.",
      "record_id": "trailhead-ohlone-lichen-bark",
      "record_type": "entity",
      "summary": "Add an Ohlone route-graph pilot for Lichen Bark and OT26-OT35, including official and alternate segments, facilities, printed mileage, derived detours, and explicit completeness/current-status gaps."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ohlone-route-graph-pilot",
      "evidence_refs": [
        "evidence-ohlone-lichen-bark-start-area"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-ohlone-lichen-bark-start-area.json",
      "reason": "Publish a source-grounded route-graph pilot with official mainline, alternate routes, facility access, printed mileage, derived detours, and explicit gaps.",
      "record_id": "claim-ohlone-lichen-bark-start-area",
      "record_type": "claim",
      "summary": "Add an Ohlone route-graph pilot for Lichen Bark and OT26-OT35, including official and alternate segments, facilities, printed mileage, derived detours, and explicit completeness/current-status gaps."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ohlone-route-graph-pilot",
      "evidence_refs": [
        "evidence-google-maps-ohlone-lichen-bark-360"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-google-maps-ohlone-lichen-bark-start-coordinate.json",
      "reason": "Publish a source-grounded route-graph pilot with official mainline, alternate routes, facility access, printed mileage, derived detours, and explicit gaps.",
      "record_id": "claim-google-maps-ohlone-lichen-bark-start-coordinate",
      "record_type": "claim",
      "summary": "Add an Ohlone route-graph pilot for Lichen Bark and OT26-OT35, including official and alternate segments, facilities, printed mileage, derived detours, and explicit completeness/current-status gaps."
    }
  ],
  "journey": [],
  "knowledge_gaps": [
    {
      "gap_id": "gap-ohlone-lichen-bark-water-current-status",
      "question": "Is the mapped Lichen Bark drinking-water facility currently operating?",
      "reason": "The official map establishes facility presence, while the 2015 imagery does not establish current operation; recheck before travel.",
      "related_ids": [
        "trailhead-ohlone-lichen-bark",
        "water-del-valle-lichen-bark",
        "claim-ohlone-lichen-bark-start-area"
      ]
    }
  ],
  "reference_evidence": [],
  "relationships": [
    {
      "evidence_ids": [
        "evidence-ohlone-lichen-bark-start-area"
      ],
      "object_id": "picnic-del-valle-lichen-bark",
      "predicate": "co_located_with",
      "relationship_id": "relationship-ohlone-lichen-bark-co-located-picnic",
      "subject_id": "trailhead-ohlone-lichen-bark",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-ohlone-map-mainline-mileage-label-039"
      ],
      "object_id": "trailhead-ohlone-lichen-bark",
      "predicate": "ends_at",
      "relationship_id": "relationship-route-leg-ohlone-mainline-050-end",
      "subject_id": "route-leg-ohlone-mainline-050",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-ohlone-lichen-bark-start-area"
      ],
      "object_id": "restroom-del-valle-lichen-bark",
      "predicate": "has_nearby_facility",
      "relationship_id": "relationship-ohlone-lichen-bark-near-restroom",
      "subject_id": "trailhead-ohlone-lichen-bark",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-ohlone-lichen-bark-start-area"
      ],
      "object_id": "water-del-valle-lichen-bark",
      "predicate": "has_nearby_facility",
      "relationship_id": "relationship-ohlone-lichen-bark-near-water",
      "subject_id": "trailhead-ohlone-lichen-bark",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-ohlone-route-segment-lichen-bark-ot40"
      ],
      "object_id": "trailhead-ohlone-lichen-bark",
      "predicate": "starts_at",
      "relationship_id": "relationship-route-segment-ohlone-lichen-bark-ot40-start",
      "subject_id": "route-segment-ohlone-lichen-bark-ot40",
      "temporal_scope": null
    }
  ],
  "route_geometry": null,
  "route_geometry_url": null,
  "type": "canonical_entity"
}