WMTS Capabilities

<!--
  示例：OpenLayers WMTS 能力文档
  要点：ol.format.WMTSCapabilities 解析 WMTS 能力文档，输出图层、矩阵集与资源模板
  依赖：OpenLayers 10.3.1 · jsDelivr CDN
-->
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<title>WMTS 能力文档</title>
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  <span>WMTS 1.0.0 能力文档</span>
  <span class="sep"></span>
  <span id="info">解析中…</span>
</div>
<pre id="log" class="log"></pre>
<script src="https://cdn.jsdelivr.net/npm/ol@10.3.1/dist/ol.js"></script>
<script>
(function () {
  'use strict';

  if (typeof ol === 'undefined') {
    document.getElementById('log').textContent = 'OpenLayers 加载失败，请检查能否访问 cdn.jsdelivr.net';
    return;
  }


  function capabilitiesXml() {
    var head = '<Capabilities xmlns="http://www.opengis.net/wmts/1.0" ' +
      'xmlns:ows="http://www.opengis.net/ows/1.1" version="1.0.0">' +
      '<ows:ServiceIdentification><ows:Title>演示 WMTS 服务</ows:Title>' +
      '<ows:ServiceType>OGC WMTS</ows:ServiceType>' +
      '<ows:ServiceTypeVersion>1.0.0</ows:ServiceTypeVersion>' +
      '</ows:ServiceIdentification>' +
      '<Contents>' +
      '<Layer><ows:Title>演示区县</ows:Title>' +
      '<ows:Identifier>demo:districts</ows:Identifier>' +
      '<Style isDefault="true"><ows:Identifier>default</ows:Identifier></Style>' +
      '<Format>image/png</Format>' +
      '<TileMatrixSetLink><TileMatrixSet>EPSG:3857</TileMatrixSet></TileMatrixSetLink>' +
      '<ResourceURL format="image/png" resourceType="tile" ' +
      'template="https://demo.invalid/wmts/demo:districts/default/EPSG:3857/' +
      '{TileMatrix}/{TileRow}/{TileCol}.png"/>' +
      '</Layer>' +
      '<TileMatrixSet><ows:Identifier>EPSG:3857</ows:Identifier>' +
      '<ows:SupportedCRS>urn:ogc:def:crs:EPSG::3857</ows:SupportedCRS>';

    var matrices = '';
    for (var z = 0; z <= 12; ++z) {
      matrices += '<TileMatrix><ows:Identifier>' + z + '</ows:Identifier>' +
        '<ScaleDenominator>' + (559082264.0287178 / Math.pow(2, z)) +
        '</ScaleDenominator>' +
        '<TopLeftCorner>-20037508.3427892 20037508.3427892</TopLeftCorner>' +
        '<TileWidth>256</TileWidth><TileHeight>256</TileHeight>' +
        '<MatrixWidth>' + Math.pow(2, z) + '</MatrixWidth>' +
        '<MatrixHeight>' + Math.pow(2, z) + '</MatrixHeight></TileMatrix>';
    }

    return head + matrices + '</TileMatrixSet></Contents></Capabilities>';
  }

  var result = new ol.format.WMTSCapabilities().read(capabilitiesXml());
  document.getElementById('log').textContent = JSON.stringify(result, null, 2);

  var layers = (result.Contents && result.Contents.Layer) || [];
  var matrixSets = (result.Contents && result.Contents.TileMatrixSet) || [];
  document.getElementById('info').textContent =
    '版本 ' + result.version + ' · 图层 ' + layers.length +
    ' · 矩阵集 ' + matrixSets.length;

})();
</script>
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