问题描述
是否可以仅使用JavaScript(通过d3，topojson或其他方式)确定给定纬度上的GeoJSON点是否位于给定的GeoJSON多边形内?
Is it possible to determine whether a GeoJSON point at a given lat,lon lies within a given GeoJSON polygon using only JavaScript (either through d3, topojson, or any other way)?
例如，我可以在此处.
然后我有一些点具有坐标，但是没有指示它们位于哪个国家/地区.
I then have a some points which have coordinates but no indication as to which country they lie within.
我想显示每个国家的总积分.
I would like to display a total point count for each country.
我可以算出哪个国家/地区包含浏览器中的每个点，还是需要使用PostGIS或类似工具在服务器上预处理我的点数据?
Can I work out which country contains each point in the browser, or do I need to preprocess my point data on the server using PostGIS or similar?
推荐答案
好像您已经了解了d3一样: https://github.com/d3/d3-geo#geo包含
Seems like d3 has you covered: https://github.com/d3/d3-geo#geoContains
当且仅当指定的GeoJSON对象包含指定的点时才返回true，否则返回false.该点必须指定为以度为单位的两元素数组[经度，纬度].对于点和多点几何，将使用精确测试.对于Sphere，始终返回true；否则，返回true.对于其他几何形状，将应用epsilon阈值.
Returns true if and only if the specified GeoJSON object contains the specified point, or false if the object does not contain the point. The point must be specified as a two-element array [longitude, latitude] in degrees. For Point and MultiPoint geometries, an exact test is used; for a Sphere, true is always returned; for other geometries, an epsilon threshold is applied.
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