android中求区域内两个坐标之间的距离的实现

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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