itowns
Version:
A JS/WebGL framework for 3D geospatial data visualization
103 lines (74 loc) • 4.22 kB
HTML
<html>
<head>
<title>Itowns - GeoidLayer</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" type="text/css" href="css/example.css">
<link rel="stylesheet" type="text/css" href="css/LoadingScreen.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.7.6/dat.gui.min.js"></script>
</head>
<body>
<div id="viewerDiv"></div>
<!-- Import iTowns source code -->
<script src="../dist/itowns.js"></script>
<script src="../dist/debug.js"></script>
<!-- Import iTowns LoadingScreen and GuiTools pluggins -->
<script src="js/GUI/LoadingScreen.js"></script>
<script src="js/GUI/GuiTools.js"></script>
<script type="text/javascript">
// ---------- CREATE A GlobeView FOR SUPPORTING DATA VISUALIZATION : ----------
// Define camera initial position
const placement = {
coord: new itowns.Coordinates('EPSG:4326', 2.351323, 48.856712),
range: 25000000,
}
// `viewerDiv` contains iTowns' rendering area (`<canvas>`)
const viewerDiv = document.getElementById('viewerDiv');
// Create a GlobeView
const view = new itowns.GlobeView(viewerDiv, placement);
// Setup loading screen and debug menu
setupLoadingScreen(viewerDiv, view);
const debugMenu = new GuiTools('menuDiv', view);
// ---------- DISPLAY CONTEXTUAL DATA : ----------
// Add one imagery layer to the scene. This layer's properties are defined in a json file, but it could be
// defined as a plain js object. See `Layer` documentation for more info.
itowns.Fetcher.json('layers/JSONLayers/Ortho.json').then((config) => {
config.source = new itowns.WMTSSource(config.source);
view.addLayer(
new itowns.ColorLayer(config.id, config),
).then(debugMenu.addLayerGUI.bind(debugMenu));
});
// Add two elevaion layers, each with a different level of detail. Here again, each layer's properties are
// defined in a json file.
function addElevationLayerFromConfig(config) {
config.source = new itowns.WMTSSource(config.source);
view.addLayer(
new itowns.ElevationLayer(config.id, config),
).then(debugMenu.addLayerGUI.bind(debugMenu));
}
itowns.Fetcher.json('layers/JSONLayers/IGN_MNT_HIGHRES.json').then(addElevationLayerFromConfig);
itowns.Fetcher.json('layers/JSONLayers/WORLD_DTM.json').then(addElevationLayerFromConfig);
// ---------- DISPLAY GEOID HEIGHT DATA : ----------
// As both ElevationLayers data consist in altitudes, and as iTowns GlobeView displays elevation data as
// ellipsoid heights, we must add a GeoidLayer to display the altitudes correctly.
// Define the source of a geoid height grid, which serves as a conversion grid between altitudes and
// ellipsoid heights.
const geoidSource = new itowns.FileSource({
url: 'https://raw.githubusercontent.com/iTowns/iTowns2-sample-data/master/altitude-conversion-grids/' +
'RAF20_float.gtx',
crs: 'EPSG:4326',
format: 'application/gtx',
});
// Specify the type geoid height data are encoded with. See GTXParser documentation at
// http://www.itowns-project.org/itowns/docs/#api/Parser/GTXParser for more.
geoidSource.dataType = 'float';
// Create a Layer to support geoid height data and add it to the view.
const geoidLayer = new itowns.GeoidLayer('geoid', {
source: geoidSource,
});
view.addLayer(geoidLayer).then(debugMenu.addLayerGUI.bind(debugMenu));
// ---------- DEBUG TOOLS : ----------
debug.createTileDebugUI(debugMenu.gui, view);
</script>
</body>
</html>