有两种方法可以获取某个纬度/经度与其他纬度/经度之间的距离:
- 使用谷歌API
function getDistanceOneToOne(lat1, lng1, lat2, lng2)
{
const Location1Str = lat1 + "," + lng1;
const Location2Str = lat2 + "," + lng2;
let ApiURL = "https://maps.googleapis.com/maps/api/distancematrix/json?";
let params = `origins=${Location1Str}&destinations=${Location2Str}&key=${GOOGLE_API_KEY}`; // you need to get a key
let finalApiURL = `${ApiURL}${encodeURI(params)}`;
let fetchResult = await fetch(finalApiURL); // call API
let Result = await fetchResult.json(); // extract json
return Result.rows[0].elements[0].distance;
}
这需要手机有网络连接,但它提供了行车距离(与行车导航器完全相同)PLUS更多信息(例如,到达的持续时间),与提供直线距离的第二种方法不同。
对于上述内容,您需要获取 Google Api 密钥 https://developers.google.com/maps/documentation/distance-matrix/get-api-key。更多信息请点击这里:谷歌地图 API https://developers.google.com/maps/documentation/distance-matrix/intro
- 使用纯数学
这发生在设备本地,它提供两个纬度/经度之间的直线距离。
function distance(lat1, lon1, lat2, lon2, unit) {
var radlat1 = Math.PI * lat1/180
var radlat2 = Math.PI * lat2/180
var theta = lon1-lon2
var radtheta = Math.PI * theta/180
var dist = Math.sin(radlat1) * Math.sin(radlat2) + Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(radtheta);
dist = Math.acos(dist)
dist = dist * 180/Math.PI
dist = dist * 60 * 1.1515
if (unit=="K") { dist = dist * 1.609344 }
if (unit=="M") { dist = dist * 0.8684 }
return dist
}
对每个项目运行上述操作之一,您将获得每个项目的距离。希望有帮助。