leaflet - 如何使用单点 + 多边形在 GeoJSON 中创建 GeometryCollection？

Question

如何将点作为单个要素添加到多边形？根据 GeoJson 规范，这被称为“GeometryCollection”。

Example of a 'GeometryCollection':

{ "type": "GeometryCollection",
"geometries": [
  { "type": "Point",
    "coordinates": [100.0, 0.0]
    },
  { "type": "LineString",
    "coordinates": [ [101.0, 0.0], [102.0, 1.0] ]
    }
 ]
}

我尝试向多边形要素添加一个点，但无法将其显示在我的 map 框 map 上，因为我猜它是无效的 GeoJson。

有谁知道这样做的正确方法是什么？网络上没有很多例子可供引用。

My take: [jsfilddle]

var myRegions = {
 "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {},
      "geometries": [
        {
            "type": "Point",
            "coordinates": [
            61.34765625,
            48.63290858589535
            ]
      },
        {
        "type": "Polygon",
        "coordinates": [
          [
            [
              59.94140624999999,
              50.65294336725709
            ],
            [
              54.931640625,
              50.90303283111257
            ],
            [
              51.943359375,
              51.04139389812637
            ],
            [
              50.9765625,
              48.19538740833338
            ],
            [
              52.55859375,
              46.46813299215554
            ],
            [
              52.998046875,
              43.8028187190472
            ],
            [
              54.4921875,
              42.391008609205045
            ],
            [
              57.041015625,
              43.29320031385282
            ],
            [
              59.8974609375,
              45.398449976304086
            ],
            [
              62.5341796875,
              44.08758502824516
            ],
            [
              65.6982421875,
              45.73685954736049
            ],
            [
              68.37890625,
              48.3416461723746
            ],
            [
              65.8740234375,
              49.18170338770663
            ],
            [
              63.720703125,
              49.97948776108648
            ],
            [
              63.80859374999999,
              52.348763181988076
            ],
            [
              61.4794921875,
              52.32191088594773
            ],
            [
              59.9853515625,
              51.86292391360244
            ],
            [
              61.9189453125,
              51.09662294502995
            ],
            [
              60.5126953125,
              50.51342652633956
            ],
            [
              59.94140624999999,
              50.65294336725709
            ]
          ]
        ]
      }
   ]
  }
 ]
};

Answer 1

正如 GeoJSON 规范中所说， Feature object正好一 geometry成员，这是一个 Geometry object (或 null)。

A feature object must have a member with the name "geometry". The value of the geometry member is a geometry object as defined above or a JSON null value.

其中可能 geometry你确实可以使用 GeometryCollection ，必须有成员 geometries .后者是其他几何图形的数组，即您的点、多边形等，甚至是另一个 GeometryCollection。

A geometry collection must have a member with the name "geometries". The value corresponding to "geometries" is an array. Each element in this array is a GeoJSON geometry object.

因此，在您的情况下，您可以简单地执行以下操作:

var myRegions = {
  "type": "FeatureCollection",
  "features": [{
    "type": "Feature", // single feature
    "properties": {},
    "geometry": { // unique geometry member
      "type": "GeometryCollection", // the geometry can be a GeometryCollection
      "geometries": [ // unique geometries member
        { // each array item is a geometry object
          "type": "Point",
          "coordinates": [
            61.34765625,
            48.63290858589535
          ]
        },
        {
          "type": "Polygon",
          "coordinates": [
            [
              [
                59.94140624999999,
                50.65294336725709
              ],
              // more points…
              [
                59.94140624999999,
                50.65294336725709
              ]
            ]
          ]
        }
      ]
    }
  }]
};

更新了 jsfiddle: http://jsfiddle.net/rh8ok5t8/18/