如何根据GeoJSON返回的坐标创建多边形形状

Question

我有GeoJSON，存储的建筑数据为坐标。

如果我将它拖放到谷歌地图上，形状将被渲染。我想了解如何从GeoJSON中编码的数据中创建babylon.js中的多边形形状。 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" 
     } 
    ] 
} 

呈现这种形式这个JSON谷歌地图：

感谢。

Answer 1

你在GeoJSON中得到的是你的多边形点的地理坐标。 Google Maps API所做的是选择从这些坐标到二维坐标系统的投影，这可以在地图上绘制。 IIRC，Google Maps API使用​​。因此，如果您使用您选择的投影公式（强烈建议使用Mercator），您将得到一组二维坐标，您可以使用它来在Babylon.js中创建多边形。 PolygonMeshBuilder。