我正在尝试将WMS叠加层集成到默认的OpenLayers地图上。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: []
数组中时,它仅给我一个空白地图。我正在使用以下代码,但是它不起作用,我需要更改什么?
<!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>
答案 0 :(得分:3)
您可以查看该网址http://www.igeo.pt/WMS/Geologia/CGP1M?SERVICE=WMS&REQUEST=GetCapabilities的GetCapabilities
有17层名为1到20的图层(缺少3、13和18),并带有葡萄牙语描述。在极少数情况下,您希望所有设置都如下所示(请注意,层构造函数只是ol.layer.Image
(Lon / Lat顺序),并且我将其设置为半透明,因此背景仍然可见)< / p>
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,通常最好在平铺区域中请求WMS,以避免在平移时连续请求整个区域
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
})