在OpenLayers上以较低分辨率渲染大于最大缩放比例的Bing地图切片,可以通过以下步骤实现:
ol.layer.Tile
类来创建图层对象,并设置图层的源为Bing地图的URL。例如:var bingLayer = new ol.layer.Tile({
source: new ol.source.BingMaps({
key: 'YourBingMapsAPIKey',
imagerySet: 'Aerial', // 设置地图类型,可选值包括Aerial、AerialWithLabels、Road等
}),
});
ol.View
类来创建地图视图,并设置视图的最大缩放级别。例如:var view = new ol.View({
maxZoom: 18, // 设置最大缩放级别
});
var resolutions = [
156543.03392804097,
78271.51696402048,
39135.75848201024,
19567.87924100512,
9783.93962050256,
4891.96981025128,
2445.98490512564,
1222.99245256282,
611.49622628141,
305.748113140705,
152.8740565703525,
76.43702828517625,
38.21851414258813,
19.109257071294063,
9.554628535647032,
4.777314267823516,
2.388657133911758,
1.194328566955879,
0.5971642834779395,
0.29858214173896974,
0.14929107086948487,
0.07464553543474244,
0.03732276771737122,
0.01866138385868561,
0.009330691929342804,
0.004665345964671402,
0.002332672982335701,
0.0011663364911678506,
0.0005831682455839253,
0.00029158412279196264,
0.00014579206139598132,
0.00007289603069799066,
0.00003644801534899533,
0.000018224007674497665,
0.000009112003837248832,
0.000004556001918624416,
0.000002278000959312208,
0.000001139000479656104,
0.000000569500239828052,
0.000000284750119914026,
0.000000142375059957013,
0.000000071187529978506,
0.000000035593764989253,
0.000000017796882494626,
0.000000008898441247313,
0.0000000044492206236565,
0.00000000222461031182825,
0.000000001112305155914125,
];
ol.tilegrid.TileGrid
类来创建瓦片网格对象。例如:var tileGrid = new ol.tilegrid.TileGrid({
resolutions: resolutions,
});
ol.source.TileImage
类来创建瓦片源对象,并设置源的瓦片网格和URL。例如:var tileSource = new ol.source.TileImage({
tileGrid: tileGrid,
url: 'https://dynamic.t0.tiles.ditu.live.com/comp/ch/{quadkey}?it=G,OS,L&mkt=zh-cn&cstl=w4c&ur=CN',
});
var customLayer = new ol.layer.Tile({
source: tileSource,
});
var map = new ol.Map({
target: 'map-container',
layers: [bingLayer, customLayer],
view: view,
});
通过以上步骤,就可以在OpenLayers上以较低分辨率渲染大于最大缩放比例的Bing地图切片。请注意,以上代码中的YourBingMapsAPIKey
需要替换为你自己的Bing地图API密钥。
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