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ol4加载任意坐标系下的瓦片离线图

ol4加载任意坐标系下的瓦片离线图

作者: 雨恋星辰 | 来源:发表于2017-08-04 14:58 被阅读51次
    <!DOCTYPE html>
    <html>
    <head>
        <title>XYZ</title>
        <link rel="stylesheet" href="https://openlayers.org/en/v4.2.0/css/ol.css" type="text/css">
        <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.4.3/proj4.js"></script>
        <script src="https://openlayers.org/en/v4.2.0/build/ol-debug.js"></script>
    </head>
    <body>
    <div id="map" class="map"></div>
    <script>
        var min=ol.proj.fromLonLat([73.62,18.11]);
        var max=ol.proj.fromLonLat([134.77,53.56]);
        var projection_4610 = new ol.proj.Projection({
            code: 'EPSG:4610',
            extent:[min[0],min[1],max[0],max[1]],
            units: 'degree',
            axisOrientation: 'neu'
        });
        ol.proj.addProjection(projection_4610);
        //var tileUrl ='http://code.xjzhcs.cn:8099/newmap/rest/services/zhundong/zd_t_xa80/MapServer/tile?z=6&x=14597&y=7315&format=png';
        var tileUrl = ' http://code.xjzhcs.cn:8099/newmap/rest/services/zhundong/zd_t_xa80/MapServer/tile?z={z}&x={x}&y={y}&format=png';
        var origin =[0,0];
        var resolutions =[
                0.00237679150184093,
                0.00118839575092046,
                0.000594197875460232,
                0.000237679150184093,
                0.000118839575092046,
                5.94197875460232E-05,
                2.37679150184093E-05,
                1.18839575092046E-05,
                4.75358300368186E-06
        ];
        var fullExtent = [88.52616,43.6405050848303,91.109587,45.3834159151697];
        var tileGrid = new ol.tilegrid.TileGrid({
            tileSize: [256,256],
            origin: origin,
            extent: fullExtent,
            resolutions: resolutions,
            minZoom:0,
            maxZoom:8
        });
        var tileXYZ = new ol.source.XYZ({
            tileGrid: tileGrid,
            projection:projection_4610,
           // url: tileUrl,
            tileUrlFunction: function (tileCoord, pixelRatio, projection) {
                if (!tileCoord) {
                    return "";
                }
                var z = tileCoord[0];
                var x = tileCoord[1];
                var y = tileCoord[2];
                return 'http://code.xjzhcs.cn:8099/newmap/rest/services/zhundong/zd_t_xa80/MapServer/tile?z='+z+'&x='+x+'&y='+y+'&format=png'; 
            }
        });
    
        var map = new ol.Map({
            target: 'map',
            layers: [
                new ol.layer.Tile({
                    source: tileXYZ
                }),
            ],
            view: new ol.View({
                center:  ol.extent.getCenter(fullExtent),
                resolutions: resolutions,
                projection: projection_4610,
                extent: fullExtent,
                zoom:1
            })
        });
    </script>
    </body>
    </html>
    

    1、坐标系,
    2、每个缩放级别的分辨率,
    3、tileGrid,
    4、tileUrlfunction

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