Javascript根据经度，纬度计算分数
有人可以帮我检查从地理位置计算分数的方法吗？
帮助将不胜感激
我正在计算纬度、经度的分数，但没有得到预期的结果。
请在下面查看我的代码。我不知道我做的是对还是错
这是代码片段。请运行代码并检查输出
const suggestions = `{
suggestions: [
{
name: "London, ON, Canada",
latitude: 42.98339,
longitude: -81.23304
},
{
name: "Londontowne, MD, USA",
latitude: 38.93345,
longitude: -76.54941
},
{
name: "London, OH, USA",
latitude: 39.88645,
longitude: -83.44825
},
{
name: "Londonderry, NH, USA",
latitude: 42.86509,
longitude: -71.37395
},
{
name: "New London, CT, USA",
latitude: 41.35565,
longitude: -72.09952
},
{
name: "New London, WI, USA",
latitude: 44.39276,
longitude: -88.73983
},
{
name: "London, KY, USA",
latitude: 37.12898,
longitude: -84.08326
}
]
}`;
console.log(calculateScore(suggestions, 43.70011, -79.4163))
function calculateScore(suggestions, latitude, longitude) {
const suggestionsResult = suggestions;
for (let i = 0; i < suggestionsResult.length; i += 1) {
let score = 0;
const lat = Math.abs(suggestionsResult[i].latitude - latitude);
const long = Math.abs(suggestionsResult[i].longitude - longitude);
score = 10 - (lat + long) / 2;
score = score > 0 ? Math.round(score) / 10 : 0;
suggestionsResult[i].score = score;
}
return suggestionsResult;
}
预期输出：
suggestions: [{
name: "London, ON, Canada",
latitude: 42.98339,
longitude: -81.23304,
score: 0.9
},
{
name: "Londontowne, MD, USA",
latitude: 38.93345,
longitude: -76.54941,
score: 0.5
},
{
name: "London, OH, USA",
latitude: 39.88645,
longitude: -83.44825,
score: 0.5
},
{
name: "Londonderry, NH, USA",
latitude: 42.86509,
longitude: -71.37395,
score: 0.5
},
{
name: "New London, CT, USA",
latitude: 41.35565,
longitude: -72.09952,
score: 0.5
},
Please help me to check the above code. I am writing correctly.
RISEBY1回答
-
繁星淼淼
我认为您将字符串而不是对象传递给您的计算方法。对于某些位置，分数与您要求的值不太匹配，它们显示的分数为 0.6 而不是 0.5，尽管我相信逻辑是正确的。例如，Londontowne, MD 与原点的距离为 3.82°（平均纬度/经度偏移），因此得分将为 round(10 - 3.82) = 6 / 10 = 0.6。我添加了另一种计算分数的方法，(scoreII) 只是为了好玩，它将计算与原点的距离为 0 公里的 1.00 到 1000 公里或更大的 0.00 的值。（我使用了这个出色答案中的距离公式：calculate-distance-between-two-latitude-longitude-points-havesine-formula）const suggestions = [ { name: "London, ON, Canada", latitude: 42.98339, longitude: -81.23304 }, { name: "Londontowne, MD, USA", latitude: 38.93345, longitude: -76.54941 }, { name: "London, OH, USA", latitude: 39.88645, longitude: -83.44825 }, { name: "Londonderry, NH, USA", latitude: 42.86509, longitude: -71.37395 }, { name: "New London, CT, USA", latitude: 41.35565, longitude: -72.09952 }, { name: "New London, WI, USA", latitude: 44.39276, longitude: -88.73983 }, { name: "London, KY, USA", latitude: 37.12898, longitude: -84.08326 } ]; console.log(calculateScore(suggestions, 43.70011, -79.4163))function getDistanceFromLatLonInKm(lat1,lon1,lat2,lon2) { var R = 6371; // Radius of the earth in km var dLat = deg2rad(lat2-lat1); // deg2rad below var dLon = deg2rad(lon2-lon1); var a = Math.sin(dLat/2) * Math.sin(dLat/2) + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * Math.sin(dLon/2) * Math.sin(dLon/2) ; var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); var d = R * c; // Distance in km return d;}function deg2rad(deg) { return deg * (Math.PI/180)}function calculateLocationScoreII(location, latitude, longitude) { const distanceKm = getDistanceFromLatLonInKm(location.latitude, location.longitude, latitude, longitude); let score = 1000 - distanceKm; score = score > 0 ? Math.round(score/10) / 100 : 0; return score;}function calculateLocationScore(location, latitude, longitude) { const lat = Math.abs(location.latitude - latitude); const long = Math.abs(location.longitude - longitude); let score = 10 - (lat + long) / 2; score = score > 0 ? Math.round(score) / 10 : 0; return score;} function calculateScore(suggestions, latitude, longitude) { // Clone the suggestions. const suggestionsResult = suggestions.map(s => { return {...s}}); return suggestionsResult.map(suggestion => { suggestion.score = calculateLocationScore(suggestion, latitude, longitude); suggestion.scoreII = calculateLocationScoreII(suggestion, latitude, longitude); return suggestion; });}
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