javascript中的地理空间查询

本文介绍了javascript中的地理空间查询的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

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

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))

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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