cb6995d71a
* Replace Math.log2 with ol/math.log2 * TypedArray.from() browser compatibility fallback * listen for input and change events for range
72 lines
2.1 KiB
JavaScript
72 lines
2.1 KiB
JavaScript
import Map from '../src/ol/Map.js';
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import OSM from '../src/ol/source/OSM.js';
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import TileLayer from '../src/ol/layer/Tile.js';
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import View from '../src/ol/View.js';
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import WMTS from '../src/ol/source/WMTS.js';
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import WMTSTileGrid from '../src/ol/tilegrid/WMTS.js';
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import {get as getProjection} from '../src/ol/proj.js';
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import {getTopLeft, getWidth} from '../src/ol/extent.js';
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// create the WMTS tile grid in the google projection
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const projection = getProjection('EPSG:3857');
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const tileSizePixels = 256;
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const tileSizeMtrs = getWidth(projection.getExtent()) / tileSizePixels;
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const matrixIds = [];
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const resolutions = [];
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for (let i = 0; i <= 14; i++) {
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matrixIds[i] = i;
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resolutions[i] = tileSizeMtrs / Math.pow(2, i);
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}
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const tileGrid = new WMTSTileGrid({
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origin: getTopLeft(projection.getExtent()),
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resolutions: resolutions,
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matrixIds: matrixIds,
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});
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const scalgoToken = 'CC5BF28A7D96B320C7DFBFD1236B5BEB';
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const wmtsSource = new WMTS({
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url: 'https://ts2.scalgo.com/olpatch/wmts?token=' + scalgoToken,
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layer: 'SRTM_4_1:SRTM_4_1_flooded_sealevels',
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format: 'image/png',
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matrixSet: 'EPSG:3857',
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attributions: [
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'<a href="https://scalgo.com" target="_blank">SCALGO</a>',
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'<a href="https://cgiarcsi.community/data/' +
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'srtm-90m-digital-elevation-database-v4-1"' +
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' target="_blank">CGIAR-CSI SRTM</a>',
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],
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tileGrid: tileGrid,
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style: 'default',
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dimensions: {
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'threshold': 100,
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},
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});
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const map = new Map({
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target: 'map',
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view: new View({
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projection: projection,
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center: [-9871995, 3566245],
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zoom: 6,
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}),
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layers: [
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new TileLayer({
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source: new OSM(),
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}),
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new TileLayer({
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opacity: 0.5,
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source: wmtsSource,
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}),
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],
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});
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const slider = document.getElementById('slider');
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const updateSourceDimension = function () {
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wmtsSource.updateDimensions({'threshold': slider.value});
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document.getElementById('theinfo').innerHTML = slider.value + ' meters';
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};
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slider.addEventListener('input', updateSourceDimension);
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slider.addEventListener('change', updateSourceDimension);
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updateSourceDimension();
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