【发布时间】:2016-12-09 09:01:29
【问题描述】:
我正在尝试做与这里相同的地图:
Openlayers3: tile grid incorrect with pixelratio=3 using Geoserver/Geowebcache as backend
地图效果很好,但放大时有一点问题,只能从缩放级别 4 更改为缩放级别 5:地图似乎“向上跳跃”。所有像素比率都会出现问题。
这是我的源代码。任何帮助表示赞赏:
<!DOCTYPE html>
<html>
<head>
<title>WMS Tiles</title>
<link rel="stylesheet" href="https://openlayers.org/en/v3.19.1/css/ol.css" type="text/css">
<!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
<script src="https://openlayers.org/en/v3.19.1/build/ol.js"></script>
</head>
<style type="text/css">
body { font-family: sans-serif; font-weight: bold; font-size: .8em; }
body { border: 0px; margin: 0px; padding: 0px; }
</style>
<body>
<div id="map" class="map" style="width: 85%; height: 85%;border: 0px; padding: 0px"> </div>
<script>
console.log("DOMContentLoaded");
try {
var config = {
"bounds": {
"left" : 475279.2689196961,
"bottom" : 5473193.572300382,
"right" : 476655.1750108673,
"top" : 5474594.636365802
}
};
var bounds = [config.bounds.left, config.bounds.bottom, config.bounds.right, config.bounds.top];
var resolutions = [
1.4,
0.7,
0.35,
0.175,
0.0875,
0.04375,
];
var tilePixelRatio = 1;
if (ol.has.DEVICE_PIXEL_RATIO > 2.5) {
tilePixelRatio = 3;
} else if (ol.has.DEVICE_PIXEL_RATIO > 1.5) {
tilePixelRatio = 2;
}
var matrixSet = 'unihd15';
// available gridsets in backend: unihd15, unihd15_512 and unihd15_768
if (tilePixelRatio > 1){
matrixSet = matrixSet + '_' + (256 * tilePixelRatio).toString();
}
var res_length = resolutions.length;
var matrixIds = new Array(res_length );
for (var z = 0; z < res_length ; ++z) {
matrixIds[z] = matrixSet + ':'+ z;
}
console.log('matrixSet is: ' + matrixSet);
console.log(matrixIds);
console.log(matrixIds[0] + ' '+ resolutions[0]);
console.log('Center: ' + ol.extent.getCenter(bounds));
console.log('Pixel ratio: ' + window.devicePixelRatio);
console.log('Bounds: ' + bounds);
console.log('TopLeft: ' + ol.extent.getTopLeft(bounds));
var projection = new ol.proj.Projection({
code: 'EPSG:32632',
units: 'm',
extent: [166021.4431, 0.0000, 833978.5569, 9329005.1825]
});
var tileGrid = new ol.tilegrid.TileGrid({
extent: bounds,
resolutions: resolutions,
origin: ol.extent.getTopLeft(bounds),
tileSize: [256, 256]
});
var view = new ol.View({
extent: bounds,
zoom: 0,
center: ol.extent.getCenter(bounds),
projection: projection,
resolutions: resolutions
});
var layerName = 'unihd15:unihd15_0_basemap';
var tms_source = new ol.source.XYZ({
projection: projection,
tileGrid: tileGrid,
tilePixelRatio: tilePixelRatio,
url: 'http://ssp.deepmap.de/geo/gwc/service/tms/1.0.0/' + layerName + '@' + matrixSet + '@png/{z}/{x}/{-y}.png'
});
var layer = new ol.layer.Tile({
source: tms_source,
extent: bounds
});
var map = new ol.Map({
projection: projection,
controls: ol.control.defaults(
{
rotate: false,
attributionOptions: {
collapsible: false
}
}
),
view: view,
layers: [layer],
target: 'map'
});
console.log("no error");
} catch (error) {
console.log("error");
console.log(error);
}
</script>
</body>
</html>
【问题讨论】:
-
您的
tileGrid对我来说看起来不正确。尝试将origin设置为ol.extent.getBottomLeft(bounds),或者完全删除origin配置。 -
无效...问题一定与缩放级别有关,因为它仅在从缩放级别 4 切换到 5 时才会发生。
-
PS:我修复了源代码中的一个错误,现在你可以运行sn-p了。
-
这种问题通常来自不正确的extent。要获得正确的范围,请转到 ssp.deepmap.de/geo/gwc/service/tms/1.0.0/…(目前不在您的 GeoServer 上,但那是 URL),然后从那里使用
<BoundingBox>。 -
嘿,它有效!非常感谢你。如果您添加答案,我会接受。
标签: gis openlayers-3 geoserver