javascript中的地理空间查询 [英] geospatial queries in javascript

问题描述

我正在寻找一个允许我进行地理空间查询的javascript库。我知道OpenLayers和GoogleMaps，但这两个不支持联合交叉等等。

I'm looking for a library in javascript that would allow me to make geospatial queries. I know about OpenLayers and GoogleMaps, but this two do not support things like union intersection and so on.

+----+
|    |
|  +-+--+
+--+-+  |
   |    |
   +----+

到

    +----+
    |    |
    |    +--+
    +--+    |
       |    |
       +----+

推荐答案

更新2014-04-29：查看草坪，看起来很有希望

JSTS 可以做浏览器中几何对象的联合。 JSTS与openlayers库集成，它扩展了openlayers几何类（例如OpenLayers.Geometry.Polygon），因此它们能够进行几何操作。示例：

JSTS can do unions of geometric objects in the browser. JSTS integrates with the openlayers library and it extends openlayers geometric classes (e.g. OpenLayers.Geometry.Polygon) so they are capable of geometric operations. Example:

>> var poly1 = OpenLayers.Geometry.Polygon.createRegularPolygon(
                                   new OpenLayers.Geometry.Point(0.0,0.0), 2, 5);
>> var poly2 = OpenLayers.Geometry.Polygon.createRegularPolygon(
                                   new OpenLayers.Geometry.Point(1.0,1.0), 2, 4);
>> var poly_u = poly1.union(poly2);
>> var poly_d = poly1.difference(poly2);
>> print(poly_u);
POLYGON((1.5667154718422638 -0.4142135623730949,1.1755705045849463 -1.618033988749895,
  -1.1755705045849465 -1.6180339887498947,-1.902113032590307 0.618033988749895,
  -0.41421356237309503 1.6990562312593451,-0.4142135623730949 2.414213562373095,
   2.414213562373095 2.414213562373095,2.414213562373095 -0.4142135623730949,
   1.5667154718422638 -0.4142135623730949))

Geoscript JS 非常好，如果你想在JS中进行服务器端几何操作。

Geoscript JS is nice if you want to do serverside geometric operations in JS.

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