javascript - 从多个 GeoJSON 字符串创建 FeatureCollection

Question

我有一个特征列表，我想创建一个 FeatureCollection 将它们分组到一个字符串中，这些特征来自不同的类型(多边形、线和点)。

它们是这样写的:

{
  "type": "Feature",
  "properties": {},
  "geometry": {
    "type": "LineString",
    "coordinates": [
      [
        -31.640625,
        15.623036831528264
      ],
      [
        -2.8125,
        -14.264383087562637
      ],
      [
        -22.5,
        -30.751277776257812
      ],
      [
        -30.937499999999996,
        -38.54816542304657
      ]
    ]
  }
}

{
  "type": "Feature",
  "properties": {},
  "geometry": {
    "type": "Polygon",
    "coordinates": [
      [
        [
          -24.960937499999996,
          29.84064389983441
        ],
        [
          -2.109375,
          21.616579336740603
        ],
        [
          2.4609375,
          43.068887774169625
        ],
        [
          -31.289062500000004,
          49.38237278700955
        ],
        [
          -24.960937499999996,
          29.84064389983441
        ]
      ]
    ]
  }
}

是否有处理此问题的 javascript 函数，我一直在研究它。

Answer 1

如果您有一个 GeoJSON 特征字符串数组，您可以像这样创建一个 GeoJSON 特征集合字符串:

var features = [
    '{ "type": "Feature", "properties": {}, ... }',
    '{ "type": "Feature", "properties": {}, ... }'
];
var collection = JSON.stringify({
    features: features.map(JSON.parse),
    type: 'FeatureCollection'
});