使用OpenLayers 6.5.0和OpenStreetMap。如何计算路线距离?我基于坐标创建了LineString。在接下来的步骤，我使用ol.sphere.getLength()和lineString.getLength()，但我得到奇怪的结果。
我尝试将坐标转换为。gpx文件，并将其导入在线gpx距离计算器，结果约为4,39公里。
链接到jsfiddle: https://jsfiddle.net/re02Lnx7/2/
代码片段:
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];
var lineString = new ol.geom.LineString(locations)
var lineLayer = new ol.layer.Vector({
source: new ol.source.Vector({
features: [new ol.Feature({
geometry: lineString,
name: 'Line'
})]
}),
style: new ol.style.Style({
stroke: new ol.style.Stroke({
color: 'red',
opacity: 0.5,
width: 5
})
})
});
var view = new ol.View({
projection: 'EPSG:4326',
center: [15.94616, 51.57555],
zoom: 13
});
var map = new ol.Map({
target: 'map',
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
lineLayer
],
target: 'map',
controls: ol.control.defaults({
attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
collapsible: false
})
}),
view: view
});
console.log(ol.sphere.getLength(lineString));
console.log(lineString.getLength());body,
html,
.map {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
}<script src="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.5.0/build/ol.js "></script>
<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.5.0/css/ol.css">
<div id="map" class="map"></div>由于您的投影不是默认的EPSG:3857，您必须在ol.sphere.getLength()中指定投影
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[15.94606, 51.57557],
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var lineString = new ol.geom.LineString(locations)
var lineLayer = new ol.layer.Vector({
source: new ol.source.Vector({
features: [new ol.Feature({
geometry: lineString,
name: 'Line'
})]
}),
style: new ol.style.Style({
stroke: new ol.style.Stroke({
color: 'red',
opacity: 0.5,
width: 5
})
})
});
var view = new ol.View({
projection: 'EPSG:4326',
center: [15.94616, 51.57555],
zoom: 13
});
var map = new ol.Map({
target: 'map',
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
lineLayer
],
target: 'map',
controls: ol.control.defaults({
attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
collapsible: false
})
}),
view: view
});
console.log(ol.sphere.getLength(lineString, {projection: 'EPSG:4326'}));
console.log(lineString.getLength());body,
html,
.map {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
}<script src="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.5.0/build/ol.js "></script>
<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.5.0/css/ol.css">
<div id="map" class="map"></div>最好使用EPSG:3857视图来匹配OSM基图
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var lineString = new ol.geom.LineString(locations).transform('EPSG:4326', 'EPSG:3857')
var lineLayer = new ol.layer.Vector({
source: new ol.source.Vector({
features: [new ol.Feature({
geometry: lineString,
name: 'Line'
})]
}),
style: new ol.style.Style({
stroke: new ol.style.Stroke({
color: 'red',
opacity: 0.5,
width: 5
})
})
});
var view = new ol.View({
center: ol.proj.fromLonLat([15.94616, 51.57555]),
zoom: 13
});
var map = new ol.Map({
target: 'map',
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
lineLayer
],
target: 'map',
controls: ol.control.defaults({
attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
collapsible: false
})
}),
view: view
});
console.log(ol.sphere.getLength(lineString));
console.log(lineString.getLength());body,
html,
.map {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
}<script src="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.5.0/build/ol.js "></script>
<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.5.0/css/ol.css">
<div id="map" class="map"></div>