比例尺級別	地面分辨率 （米/像素）	比例尺
0	156543.03	1：591658700.82
1	78271.515	1：295829350.4
2	39135.7575	1：147914675.2
3	19567.87875	1：73957337.6
4	9783.939375	1：36978668.8
5	4891.969688	1：18489334.4
6	2445.984844	1：9244667.2
7	1222.992422	1：4622333.6
8	611.4962109	1：2311166.8
9	305.7481055	1：1155583.4
10	152.8740527	1：577791.7
11	76.43702637	1：288895.85
12	38.21851318	1：144447.925
13	19.10925659	1：72223.9625
14	9.554628296	1：36111.98125
15	4.777314148	1：18055.99063
16	2.388657074	0.105185127
17	1.194328537	0.052939792
18	0.597164268	0.026817118
19	0.298582134	0.013755775
20	0.149291067	0.007225116

?根據比例尺級別和地面分辨率 （米/像素）之間的關系：

當地圖縮放級別zoom===15的時候，1像素大約是5米

當地圖縮放級別zoom===14的時候，1像素大約是10米

當地圖縮放級別zoom===13的時候，1像素大約是19米

當地圖縮放級別zoom===12的時候，1像素大約是38米

當地圖縮放級別zoom===11的時候，1像素大約是76米

當地圖縮放級別zoom===10的時候，1像素大約是153米

---

根據我們地圖上面的marker圖標icon寬度和高度（一般情況是40像素的寬高），為了不讓地圖縮放級別較小的時候，和之間重疊，這樣看起來會像這樣

有密集恐懼癥的人看上去會頭皮發麻，為了解決這個問題

我們就要大概計算下marker之間的距離實際是多少km

?根據剛才的zoom放大級別和米/像素之間的關系：

當地圖縮放級別zoom===15的時候，距離40像素的marker不會重疊，實際經緯度距離大約是200米

當地圖縮放級別zoom===14的時候，距離40像素的marker不會重疊，實際經緯度距離大約是400米

當地圖縮放級別zoom===13的時候，距離40像素的marker不會重疊，實際經緯度距離大約是760米

當地圖縮放級別zoom===12的時候，距離40像素的marker不會重疊，實際經緯度距離大約是1520米

當地圖縮放級別zoom===11的時候，距離40像素的marker不會重疊，實際經緯度距離大約是3040米

當地圖縮放級別zoom===10的時候，距離40像素的marker不會重疊，實際經緯度距離大約是6120米

---

依次類推我們只要根據不同的zoom級別，從marks經緯度坐標數組中計算篩選大于等于指定距離的經緯度坐標出來顯示即可，這樣就不會出現一大堆重疊的錨點了，算法如下

function getCoordinatesWithinDistance(coordinates, threshold) {const R = 6371; // 地球平均半徑，單位為kmlet filteredCoordinates = [];for (let i = 0; i < coordinates.length - 1; i++) {for (let j = i + 1; j < coordinates.length; j++) {const lat1 = coordinates[i][0] * (Math.PI / 180);const lon1 = coordinates[i][1] * (Math.PI / 180);const lat2 = coordinates[j][0] * (Math.PI / 180);const lon2 = coordinates[j][1] * (Math.PI / 180);const dLat = lat2 - lat1;const dLon = lon2 - lon1;const a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +Math.cos(lat1) * Math.cos(lat2) *Math.sin(dLon / 2) * Math.sin(dLon / 2);const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));const distance = R * c;if (distance >= threshold) {filteredCoordinates.push(coordinates[i], coordinates[j]);}}}return [...new Set(filteredCoordinates)];
}// 示例使用
const coordinates = [[ "115.467110000000", "35.243117000000" ],[ "115.464244000000", "35.245750000000" ],[ "115.465704000000", "35.244345000000" ],[ "115.466345000000", "35.248416000000" ],[ "115.465013000000", "35.247524000000" ],[ "115.462093000000", "35.245915000000" ],[ "115.455760000000", "35.244595000000" ],[ "115.465165000000", "35.249693000000" ],[ "115.455576000000", "35.247933000000" ],[ "115.455679000000", "35.247791000000" ],[ "115.454584000000", "35.257640000000" ],[ "115.450297000000", "35.259151000000" ],[ "115.491538000000", "35.221940000000" ],[ "115.419223000000", "35.240104000000" ],[ "115.473707000000", "35.144371000000" ],[ "115.473707000000", "35.144371000000" ],[ "115.428679000000", "35.236554000000" ],[ "115.444323000000", "35.225330000000" ],[ "115.445079000000", "35.225690000000" ],[ "115.451545000000", "35.236176000000" ],[ "115.451267000000", "35.234782000000" ],[ "115.452094000000", "35.244713000000" ],[ "115.467585000000", "35.244163000000" ],[ "115.462068000000", "35.243704000000" ],[ "115.465203000000", "35.244530000000" ],[ "115.462323000000", "35.245681000000" ],[ "115.471151000000", "35.262163000000" ],[ "115.478472000000", "35.255419000000" ],[ "115.479916000000", "35.253316000000" ],[ "115.468012000000", "35.244962000000" ],[ "115.470219000000", "35.248809000000" ],[ "115.473124000000", "35.255361000000" ],[ "115.472185000000", "35.234466000000" ],[ "115.474531000000", "35.235291000000" ],[ "115.385856000000", "35.325307000000" ],[ "115.391057000000", "35.303206000000" ],[ "115.390317000000", "35.324235000000" ],[ "115.368813000000", "35.305667000000" ],[ "115.386246000000", "35.325210000000" ],[ "115.395388000000", "35.322654000000" ],[ "115.395413000000", "35.322335000000" ],[ "115.404367000000", "35.330275000000" ],[ "115.356020000000", "35.316644000000" ],[ "115.360492000000", "35.317244000000" ],[ "115.340425000000", "35.323442000000" ],[ "115.390281000000", "35.347751000000" ],[ "115.376570000000", "35.277569000000" ],[ "115.407491000000", "35.271052000000" ],[ "115.409180000000", "35.270858000000" ],[ "115.383049000000", "35.283143000000" ],[ "115.394518000000", "35.275512000000" ],[ "115.412552000000", "35.282239000000" ],[ "115.412294000000", "35.280501000000" ],[ "115.412943000000", "35.281405000000" ],[ "115.414286000000", "35.282532000000" ],[ "115.372445000000", "35.278126000000" ],[ "115.411029000000", "35.294639000000" ],[ "115.411228000000", "35.294372000000" ],[ "115.354823000000", "35.277249000000" ],[ "115.351049000000", "35.283865000000" ],[ "115.347226000000", "35.285854000000" ],[ "115.364996000000", "35.295540000000" ],[ "115.339617000000", "35.289147000000" ],[ "115.339886000000", "35.289394000000" ],[ "115.353355000000", "35.287276000000" ],[ "115.360219000000", "35.286173000000" ],[ "115.354138000000", "35.294477000000" ],[ "115.371264000000", "35.290273000000" ],[ "115.371300000000", "35.290266000000" ],[ "115.371486000000", "35.283174000000" ],[ "115.404012000000", "35.293897000000" ],[ "115.367200000000", "35.290455000000" ],[ "115.352698000000", "35.272023000000" ],[ "115.386620000000", "35.263631000000" ],[ "115.388953000000", "35.231218000000" ],[ "115.386132000000", "35.232681000000" ],[ "115.435882000000", "35.353432000000" ],[ "115.339308000000", "35.251538000000" ],[ "115.339175000000", "35.251426000000" ],[ "115.301593000000", "35.263379000000" ],[ "115.339755000000", "35.251734000000" ],[ "115.342580000000", "35.252439000000" ],[ "115.339765000000", "35.251743000000" ],[ "115.384734000000", "35.241246000000" ],[ "115.369837000000", "35.263812000000" ],[ "115.365957000000", "35.254146000000" ],[ "115.361105000000", "35.254655000000" ],[ "115.363260000000", "35.254741000000" ],[ "115.404880000000", "35.235044000000" ],[ "115.395811000000", "35.245298000000" ],[ "115.393554000000", "35.245817000000" ],[ "115.405384000000", "35.247373000000" ],[ "115.450660000000", "35.379927000000" ],[ "115.450633000000", "35.379905000000" ],[ "115.460214000000", "35.367124000000" ],[ "115.436672000000", "35.408003000000" ],[ "115.436659000000", "35.407997000000" ],[ "115.428856000000", "35.413945000000" ],[ "115.428964000000", "35.413850000000" ],[ "115.436457000000", "35.407923000000" ]
];
const zoom = 10
const threshold = 6.120; // 指定的距離閾值，單位km
const result = getCoordinatesWithinDistance(coordinates, threshold);
console.log(`當縮放級別是${zoom}的時候，返回在數組coordinates中距離大于等于${threshold}km的經緯度坐標數組：`, result);