如何使用墨卡托投影计算OpenLayers中2点之间的距离?
由于
答案 0 :(得分:16)
使用point1.distanceTo(point2)
var Geographic = new OpenLayers.Projection("EPSG:4326");
var Mercator = new OpenLayers.Projection("EPSG:900913");
function distanceBetweenPoints(latlng1, latlng2){
var point1 = new OpenLayers.Geometry.Point(latlng1.lon, latlng1.lat).transform(Geographic, Mercator);
var point2 = new OpenLayers.Geometry.Point(latlng2.lon, latlng2.lat).transform(Geographic, Mercator);
return point1.distanceTo(point2);
}
答案 1 :(得分:4)
如果使用 openlayers3
,您可以使用该方法在两点之间设置ol.geom.LineString对象并计算线的长度:
this.distanceBetweenPoints = function(latlng1, latlng2){
var line = new ol.geom.LineString([latlng1, latlng2]);
return Math.round(line.getLength() * 100) / 100;
};
然后,您可以使用某种形式获得可读值:
this.formatDistance = function(length) {
if (length >= 1000) {
length = (Math.round(length / 1000 * 100) / 100) +
' ' + 'km';
} else {
length = Math.round(length) +
' ' + 'm';
}
return length;
}
答案 2 :(得分:0)
尝试 getLength
获得几何的球面长度:
import LineString from 'ol/geom/LineString';
import {getLength} from 'ol/sphere';
const line = new LineString([coordStart, coordEnd]);
const distance = getLength(line);
API:https://openlayers.org/en/latest/apidoc/module-ol_sphere.html#.getLength