{
  "revision": "ground22-flowerground-patch01",
  "feature": {
    "type": "Feature",
    "id": "library-front-50E-low-planting-source",
    "properties": {
      "id": "library-front-50E-low-planting-source",
      "name": "图书馆南侧文化广场草花地（源图地块，材质示意）",
      "sourceHandle": "50E",
      "sourceLabel": "文化广场",
      "displayClassRecommendation": "source-bounded low herbaceous/seasonal flower planting with bare-soil variation; no hardcoded flowerbed pattern",
      "sourceAreaM2": 9928.502373774323,
      "siteBounds": [
        -21.997920416790294,
        -9.20978197671866,
        55.5475757110471,
        121.19933710825717
      ],
      "siteCentroid": [
        16.771979096022996,
        55.53292275391916
      ],
      "sourceBasis": "Exact native50E ring retaining its northern stepped open recess, under unchanged ground22global CAD transform; no buffering, tracing or new internal cuts.",
      "existsAsPredominantlyPlantedArea": true,
      "landcoverEvidence": "Official homepage aerial0s: flower-covered central tract south of library; official lotus ground photograph: intervening herbaceous/flower/bare-soil zone;2025-05-26Esri: green-brown striped tract distinct from paved sides.",
      "wholePolygonUniformVegetationVerified": false,
      "pavingNote": "No separately mapped large internal paved field. Small sculpture base and possible paths are visible/possible but exact coordinates/areas unverified. Do not claim every square metre is planted.",
      "sourceNorthRecessAreaM2": 77.71686605366325,
      "nativeRingIncludesRecess": true,
      "sourceNorthRecessIsSculptureVerified": false,
      "currentExactBoundaryVerified": false,
      "materialVerified": false,
      "sourceURLs": [
        "https://ggzy.xinjiang.gov.cn/xinjiangggzy/jyxx/001004/001004003/20260710/1101000035537406.html",
        "https://www.xjit.edu.cn/attachment/core/label/2026_04/28_11/5140ca7d251d9b90.mp4",
        "https://www.xjit.edu.cn/attachment/cms/item/2025_06/24_12/b4fa8f3535bd47c8.JPG"
      ],
      "positionUncertainty": "Planning-base boundary with approximate fixed registration;5.248m OSM fit is not absolute accuracy; no2026as-built measurement."
    },
    "geometry": {
      "type": "Polygon",
      "coordinates": [
        [
          [
            55.5475757110471,
            120.8508619561926
          ],
          [
            19.370010091981385,
            121.01473075674039
          ],
          [
            19.35686437545519,
            118.11264995507918
          ],
          [
            21.20509352155932,
            118.10427792801966
          ],
          [
            21.168752762307122,
            110.08160204686283
          ],
          [
            13.05861775867379,
            110.11833897570978
          ],
          [
            13.095242911214882,
            118.20379808314283
          ],
          [
            15.04018455199548,
            118.19498797354754
          ],
          [
            15.053045872264192,
            121.03428474554858
          ],
          [
            -21.385816158654052,
            121.19933710825717
          ],
          [
            -21.997920416790294,
            -8.861292529323691
          ],
          [
            54.935471387296275,
            -9.20978197671866
          ],
          [
            55.5475757110471,
            120.8508619561926
          ]
        ]
      ]
    }
  },
  "sourceRingUnchanged": true,
  "sourceAreaM2": 9928.502373774323,
  "triangleAreaM2": 9928.502373774323,
  "nativeRecessPreserved": true,
  "illustrativePositions": true,
  "plantSpeciesVerified": false,
  "hardPavingOrSculptureAdded": false,
  "layer": "illustrative-flowerground",
  "defaultVisible": true,
  "notes": [
    "Source-bounded predominant herbaceous/flower landcover supported by official aerial and ground photo.",
    "Individual plants, material color and bare-soil distribution are illustrative, not surveyed or current seasonal state.",
    "Northern original recess remains open; no guessed sculpture, base, path or flower-bed pattern."
  ],
  "GLBSHA256": "d7464fc82f06954b6644596f40bc996b3c1770223eceddc2f7abf2c3a9179001",
  "GLBBytes": 976508,
  "frame": "Exact same world transform and glTF origin as ground22; do NOT recenter the overlay",
  "worldXZ": [
    [
      83.13404492671724,
      -103.82290006088152
    ],
    [
      48.07075107032651,
      -112.73404651046876
    ],
    [
      47.35591894904102,
      -109.9213501479703
    ],
    [
      49.14722241402834,
      -109.46609970736611
    ],
    [
      47.17110017368512,
      -101.69052321194793
    ],
    [
      39.31075830760349,
      -103.68818813065283
    ],
    [
      41.30234513065212,
      -111.5246141212451
    ],
    [
      43.18738233414403,
      -111.04554174098838
    ],
    [
      43.886749675487536,
      -113.79738782951091
    ],
    [
      8.57020735698655,
      -122.77289600767331
    ],
    [
      -23.48822885352827,
      3.2762956640036514
    ],
    [
      51.075605194183424,
      22.226305465619838
    ],
    [
      83.13404492671724,
      -103.82290006088152
    ]
  ]
}