如何从 GeoJSON 返回的坐标创建多边形形状

Question

我有 GeoJSON，以存储的建筑数据作为坐标。

如果我将它拖放到 google 地图上，就会渲染形状。我想学习如何根据 GeoJSON 中编码的数据在 babylon.js 中创建多边形形状。 JSON 我说的是：

{
   "type":"FeatureCollection",
   "features":[
      {
         "id":"w26358613",
         "properties":{
            "levels":8
         },
         "geometry":{
            "type":"Polygon",
            "coordinates":[
               [
                  [ 13.426791, 52.518344 ],
                  [ 13.426866, 52.518303 ],
                  [ 13.426951, 52.51826  ],
                  [ 13.427045, 52.518216 ],
                  [ 13.427139, 52.518175 ],
                  [ 13.427233, 52.518136 ],
                  [ 13.427341, 52.518095 ],
                  [ 13.427484, 52.518046 ],
                  [ 13.427489, 52.51805  ],
                  [ 13.42749,  52.51805  ],
                  [ 13.427493, 52.518052 ],
                  [ 13.427677, 52.518013 ],
                  [ 13.427653, 52.517971 ],
                  [ 13.427668, 52.517968 ],
                  [ 13.42762,  52.517885 ],
                  [ 13.427605, 52.517887 ],
                  [ 13.42758,  52.517846 ],
                  [ 13.427396, 52.517885 ],
                  [ 13.427435, 52.517952 ],
                  [ 13.427253, 52.518014 ],
                  [ 13.427237, 52.517997 ],
                  [ 13.427073, 52.51806  ],
                  [ 13.427092, 52.518077 ],
                  [ 13.426946, 52.51814  ],
                  [ 13.426927, 52.518124 ],
                  [ 13.426775, 52.518198 ],
                  [ 13.426796, 52.518213 ],
                  [ 13.426662, 52.518285 ],
                  [ 13.426639, 52.518271 ],
                  [ 13.426558, 52.518318 ],
                  [ 13.426502, 52.518353 ],
                  [ 13.426503, 52.518354 ],
                  [ 13.426483, 52.518366 ],
                  [ 13.426559, 52.518474 ],
                  [ 13.426651, 52.51845  ],
                  [ 13.426643, 52.518438 ],
                  [ 13.426647, 52.518436 ],
                  [ 13.426641, 52.518433 ],
                  [ 13.426727, 52.51838  ],
                  [ 13.426791, 52.518344 ]
               ]
            ]
         },
         "type":"Feature"
      }
   ]
}

Google 地图呈现这种形式 JSON：

谢谢。

Answer 1

您在 GeoJSON 中得到的是多边形点的地理坐标。 Google 地图 API 所做的是选择从这些坐标到二维坐标系的投影，可以在地图上绘制。 IIRC，Google 地图 API 使用 spherical Mercator projection. So, if you use formulas from the projection you choose (strongly suggest Mercator for that) you'll get set of 2D coordinated you could use to create polygon in Babylon.js use, e.g. PolygonMeshBuilder.

如何从 GeoJSON 返回的坐标创建多边形形状

How to create polygon shape from coordinates returned by GeoJSON

javascript

geojson

babylonjs