geolocation - 根据经纬度查找最近的机场

using System;  
namespace HaversineFormula  
{  
    /// <summary>  
    /// The distance type to return the results in.  
    /// </summary>  
    public enum DistanceType { Miles, Kilometers };  
    /// <summary>  
    /// Specifies a Latitude / Longitude point.  
    /// </summary>  
    public struct Position  
    {  
        public double Latitude;  
        public double Longitude;  
    }  
    class Haversine  
    {  
        /// <summary>  
        /// Returns the distance in miles or kilometers of any two  
        /// latitude / longitude points.  
        /// </summary>  
        /// <param name=”pos1″&gt;</param>  
        /// <param name=”pos2″&gt;</param>  
        /// <param name=”type”&gt;</param>  
        /// <returns></returns>  
        public double Distance(Position pos1, Position pos2, DistanceType type)  
        {  
            double R = (type == DistanceType.Miles) ? 3960 : 6371;  
            double dLat = this.toRadian(pos2.Latitude - pos1.Latitude);  
            double dLon = this.toRadian(pos2.Longitude - pos1.Longitude);  
            double a = Math.Sin(dLat / 2) * Math.Sin(dLat / 2) +  
                Math.Cos(this.toRadian(pos1.Latitude)) * Math.Cos(this.toRadian(pos2.Latitude)) *  
                Math.Sin(dLon / 2) * Math.Sin(dLon / 2);  
            double c = 2 * Math.Asin(Math.Min(1, Math.Sqrt(a)));  
            double d = R * c;  
            return d;  
        }  
        /// <summary>  
        /// Convert to Radians.  
        /// </summary>  
        /// <param name="val"></param>  
        /// <returns></returns>  
        private double toRadian(double val)  
        {  
            return (Math.PI / 180) * val;  
        }  
    }  
}

伪代码：

这个伪代码应该会给你你正在寻找的答案。我没有对此进行测试，C# 可能会有语法错误，但它的要点应该很清楚。

/* Set parameters */
Position currentPosition = new Position();
Position airportPosition = new Position();
Double minDistance = Double.MaxValue;
String closestAirportName = "UNKNOWN";
Haversine hv = new Haversine();

/* Set current position, remains fixed throughout */
currentPosition.Latitude = 0.000;
currentPosition.Longitude = 0.000; 

/* Compare distance to each airport with current location
* and save results if this is the closest airport so far*/
Foreach (airport in airports) {
    airportPosition = new Position(airport.Lat, airport.Lon);
    Double distanceToAirport = hv.Distance(currentPosition, airportPosition, DistanceType.Kilometers)

    if (distanceToAirport < minDistance) {
        minDistance = distanceToAirport
        closestAirportName = airport.Name
    }
}

score 0 · Accepted Answer

this.nearestAirport = this.airports.find((airport) => {
              return (Math.round(airport.latitude) === Math.round(currentLocation.latitude) &&
                      Math.round(airport.longitude) === Math.round(currentLocation.longitude));
            });

score -1 · Accepted Answer

查找最近的机场并获取从指定点 (Lat,Lan) 到达那里的路线

这是一个谷歌方法，没有任何数据库来实现这一点：

onclick="getNeighbourhood('<%= propLat %>','<%= propLan %>');"

有关完整代码，请访问此处FULL NEAREST AIRPORT SCRIPT AND STYLE

查找最近的机场

function getNeighbourhood(propLatQ,propLanQ) {
propLat=propLatQ;
propLan=propLanQ;
var myLatlng = new google.maps.LatLng(propLat,propLan);
var myOptions = {
  zoom: 8,
  center: myLatlng,
  mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("map"), myOptions);
places = new google.maps.places.PlacesService(map);
google.maps.event.addListener(map, 'tilesloaded', tilesLoaded);
autocomplete = new google.maps.places.Autocomplete(document.getElementById('autocomplete'));
google.maps.event.addListener(autocomplete, 'place_changed', function() {
  showSelectedPlace();
});

geolocation - 根据经纬度查找最近的机场

5 回答 5

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