Adding map markers to Open Layers 6

问题

My question is simple: How do you add a marker at a specific longitude and latitude?

Working through the open layers example page I have created a new map with a marker.

I added the marker using the new ol.Feature but it seems no matter what I set the coordinates to the marker position will not change.

Please can anyone offer advice on why the map marker is not showing in the correct position?

const iconFeature = new ol.Feature({
  geometry: new ol.geom.Point([53, -2]), //This marker will not move.
  name: 'Somewhere',
});

const map = new ol.Map({
  target: 'map',
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM(),
    }),
    new ol.layer.Vector({
      source: new ol.source.Vector({
        features: [iconFeature]
      }),
      style: new ol.style.Style({
        image: new ol.style.Icon({
          anchor: [0.5, 46],
          anchorXUnits: 'fraction',
          anchorYUnits: 'pixels',
          src: 'https://openlayers.org/en/latest/examples/data/icon.png'
        })
      })
    })
  ],
  view: new ol.View({
    center: ol.proj.fromLonLat([53,-2]),
    zoom: 6
  })
});

.map {
  width: 100%;
  height: 400px;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.1.1/build/ol.js"></script>

<div id="map" class="map">
  <div id="popup"></div>
</div>

回答1:

You can use ol.proj.fromLonLat to transform EPSG:4326 to EPSG:3857, for both features and centering the map. In general you have to do that as the default projection is EPSG:3857.

for icons:

const iconFeature = new ol.Feature({
  geometry: new ol.geom.Point(ol.proj.fromLonLat([-2, 53])),
  name: 'Somewhere near Nottingham',
});

to center the view/map at the same place:

view: new ol.View({
  center: ol.proj.fromLonLat([-2, 53]),
  zoom: 6
})

working code snippet:

const iconFeature = new ol.Feature({
  geometry: new ol.geom.Point(ol.proj.fromLonLat([-2, 53])),
  name: 'Somewhere near Nottingham',
});

const map = new ol.Map({
  target: 'map',
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM(),
    }),
    new ol.layer.Vector({
      source: new ol.source.Vector({
        features: [iconFeature]
      }),
      style: new ol.style.Style({
        image: new ol.style.Icon({
          anchor: [0.5, 46],
          anchorXUnits: 'fraction',
          anchorYUnits: 'pixels',
          src: 'https://openlayers.org/en/latest/examples/data/icon.png'
        })
      })
    })
  ],
  view: new ol.View({
    center: ol.proj.fromLonLat([-2, 53]),
    zoom: 6
  })
});

html, body {
  width: 100%;
  height: 100%;
  padding: 0px;
  margin: 0px;
}
.map {
  width: 100%;
  height: 100%;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.1.1/build/ol.js"></script>

<div id="map" class="map">
  <div id="popup"></div>
</div>

回答2:

By default, a view as the 3857 projection, whose unit is meters.

The coordinates you have entered are therefore 53 meters away from [0;0], in the sea not too far from Nigeria.

You can either enter a coordinate in 3857,like

geometry: new ol.geom.Point([-8185391,5695875]),

or you would have to project the coordinates to 3857, as indicated in the comments, using ol.proj.fromLonLat([53,-2])

Remember that coordinates are expressed as longitude first, then latitude, as explained in the doc.

来源：https://stackoverflow.com/questions/59720237/adding-map-markers-to-open-layers-6

标签

javascript

OpenLayers

openlayers-6