android中求区域内两个坐标之间的距离的实现
16lz
2021-12-04
求两个坐标之间距离
解决方案整理自CSDN问答：http://ask.csdn.net/questions/703
Location对象带和距离相关的方法，求两个坐标距离：public static void distanceBetween (double startLatitude, double startLongitude, double endLatitude, double endLongitude, float[] results)
ParametersstartLatitude the starting latitudestartLongitude the starting longitudeendLatitude the ending latitudeendLongitude the ending longituderesults an array of floats to hold the results
详细解释见这里：distanceBetween(double, double, double, double, float[])
在大量坐标之间找最近距离的坐标
如果你用Mongodb，获取最近的坐标很简单，Mongodb自带geoNearCommand,可以参照这里：GeospatialIndexing-geoNearCommand
> db.runCommand( { geoNear : "places" , near : [50,50], num : 10 } );> db.runCommand({geoNear:"asdf", near:[50,50]}){ "ns" : "test.places", "near" : "1100110000001111110000001111110000001111110000001111", "results" : [ { "dis" : 69.29646421910687, "obj" : { "_id" : ObjectId("4b8bd6b93b83c574d8760280"), "y" : [ 1, 1 ], "category" : "Coffee" } }, { "dis" : 69.29646421910687, "obj" : { "_id" : ObjectId("4b8bd6b03b83c574d876027f"), "y" : [ 1, 1 ] } } ], "stats" : { "time" : 0, "btreelocs" : 1, "btreelocs" : 1, "nscanned" : 2, "nscanned" : 2, "objectsLoaded" : 2, "objectsLoaded" : 2, "avgDistance" : 69.29646421910687 }, "ok" : 1} PS. 这里有很多计算GEO距离相关的公式：http://www.movable-type.co.uk/scripts/latlong.html
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