如何将WMS添加到OpenLayers 5.3.0? [英] How do I add WMS to OpenLayers 5.3.0?
问题描述
我正在尝试将WMS叠加层集成到默认的OpenLayers映射中.仅使用ol.source.OSM({})图层，地图就可以很好地呈现，但是当我将WMS图层添加到layers: []数组时，它只给了我一个空白地图.我正在使用以下代码，但是它不起作用，我需要更改什么?
I am trying to integrate a WMS overlay onto my default OpenLayers map. Using just the ol.source.OSM({}) layer the map renders fine, but when I add the WMS layer to the layers: [] array it just gives me a blank map. I am using the following code but it isn't working, what do I need to change?
<!doctype html>
<html lang="en">
<head>
<link rel="stylesheet" href="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/v5.3.0/css/ol.css" type="text/css">
<style>
.map {
height: 100%;
width: 100%;
}
</style>
<script src="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/v5.3.0/build/ol.js"></script>
<title>OpenLayers example</title>
</head>
<body>
<h2>WMS Map</h2>
<div id="map" class="map"></div>
<script type="text/javascript">
var map = new ol.Map({
target: 'map',
layers: [
new ol.layer.Tile(
{
source: new ol.source.OSM({})
}),
new ol.layer.ImageWMS(
{
source: new ol.source.ImageWMS(
{
url: 'http://www.igeo.pt/WMS/Geologia/CGP1M'
})
})
],
view: new ol.View(
{
center: ol.proj.fromLonLat([37.41, 8.82]),
zoom: 4
})
});
</script>
</body>
</html>
推荐答案
You can look at the GetCapabilities for that url http://www.igeo.pt/WMS/Geologia/CGP1M?SERVICE=WMS&REQUEST=GetCapabilities
There are 17 layers named 1 to 20 (3, 13 and 18 are missing) with Portuguese descriptions. In the unlikely event of you wanting all the setup would be as below (note the layer constructor is simply ol.layer.Image, the Lon/Lat order, and I've made it semi-opaque so the background is still visible)
new ol.layer.Tile(
{
source: new ol.source.OSM({})
}),
new ol.layer.Image(
{
source: new ol.source.ImageWMS(
{
url: 'http://www.igeo.pt/WMS/Geologia/CGP1M',
params: { LAYERS: '1,2,4,5,6,7,8,9,10,11,12,14,15,16,17,19,20'}
}),
opacity: 0.5
})
],
view: new ol.View(
{
center: ol.proj.fromLonLat([-8.82, 37.41]),
zoom: 4
})
在全屏地图上，在平铺区域中请求WMS通常更为有效，以避免在平移时连续请求整个区域
On a full screen map it is usually more efficient to request the WMS in tiled areas to avoid continually requesting the whole area when panning
new ol.layer.Tile(
{
source: new ol.source.TileWMS(
{
url: 'http://www.igeo.pt/WMS/Geologia/CGP1M',
params: { LAYERS: '1,2,4,5,6,7,8,9,10,11,12,14,15,16,17,19,20'}
}),
opacity: 0.5
})
这篇关于如何将WMS添加到OpenLayers 5.3.0?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
