Display a map with TMS TIFF tiles in Float32 format.
You can implement your own ImageFormat
to load images in a non-standard MIME type (by default, only PNG/JPG/WEBP tiles are loaded by Giro3D).
import * as turf from '@turf/turf';
import { MapControls } from 'three/examples/jsm/controls/MapControls.js';
import XYZ from 'ol/source/XYZ.js';
import Extent from '@giro3d/giro3d/core/geographic/Extent.js';
import Instance from '@giro3d/giro3d/core/Instance.js';
import ElevationLayer from '@giro3d/giro3d/core/layer/ElevationLayer.js';
import Map from '@giro3d/giro3d/entities/Map.js';
import Inspector from '@giro3d/giro3d/gui/Inspector.js';
import GeoTIFFFormat from '@giro3d/giro3d/formats/GeoTIFFFormat.js';
import TiledImageSource from '@giro3d/giro3d/sources/TiledImageSource.js';
import Fetcher from '@giro3d/giro3d/utils/Fetcher.js';
const x = -13602618.385789588;
const y = 5811042.273912458;
// Defines geographic extent: CRS, min/max X, min/max Y
const extent = new Extent('EPSG:3857', x - 12000, x + 13000, y - 4000, y + 26000);
// `viewerDiv` will contain Giro3D' rendering area (the canvas element)
const viewerDiv = document.getElementById('viewerDiv');
// Creates a Giro3D instance
const instance = new Instance(viewerDiv, {
crs: extent.crs(),
renderer: {
clearColor: 0x0a3b59,
},
});
// Creates a map that will contain the layer
const map = new Map('planar', {
extent,
hillshading: true,
doubleSided: true,
discardNoData: true,
backgroundColor: 'white',
});
instance.add(map);
let footprint;
/**
* A function that will override the default intersection test for image sources (by default
* performing intersection on extents, i.e rectangles). Here we want to exclude tiles that do not
* intersect with the GeoJSON footprint of the dataset.
*
* @param {Extent} tileExtent The extent to test.
*/
function customIntersectionTest(tileExtent) {
if (!footprint) {
return true;
}
const corners = [
[tileExtent.topLeft().x, tileExtent.topLeft().y],
[tileExtent.topRight().x, tileExtent.topRight().y],
[tileExtent.bottomRight().x, tileExtent.bottomRight().y],
[tileExtent.bottomLeft().x, tileExtent.bottomLeft().y],
];
const extentAsPolygon = turf.helpers.polygon([
[corners[0], corners[1], corners[2], corners[3], corners[0]],
]);
const intersects = turf.booleanIntersects(turf.toWgs84(extentAsPolygon), footprint);
return intersects;
}
Fetcher.json('data/MtStHelens-footprint.geojson')
.then(geojson => {
footprint = turf.toWgs84(geojson);
const source = new TiledImageSource({
containsFn: customIntersectionTest, // Here we specify our custom intersection test
source: new XYZ({
minZoom: 10,
maxZoom: 16,
url: 'https://3d.oslandia.com/dem/MtStHelens-tiles/{z}/{x}/{y}.tif',
}),
format: new GeoTIFFFormat(),
});
map.addLayer(
new ElevationLayer({
name: 'osm',
extent,
source,
noDataOptions: {
replaceNoData: true,
},
}),
).catch(e => console.error(e));
})
.catch(e => console.error(e));
const center = extent.centerAsVector3();
instance.camera.camera3D.position.set(center.x, center.y - 1, 50000);
// Instanciates controls
const controls = new MapControls(instance.camera.camera3D, instance.domElement);
controls.target.copy(center);
instance.useTHREEControls(controls);
Inspector.attach(document.getElementById('panelDiv'), instance);
// Bind events
<!doctype html>
<html lang="en">
<head>
<title>32-bit TIFF elevation tiles</title>
<meta charset="UTF-8" />
<meta name="name" content="tifftiles" />
<meta name="description" content="Display a map with TMS TIFF tiles in Float32 format." />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="icon" href="https://giro3d.org/images/favicon.svg" />
<link href="https://giro3d.org/assets/bootstrap-custom.css" rel="stylesheet" />
<script src="https://giro3d.org/assets/bootstrap.bundle.min.js"></script>
<link
rel="stylesheet"
type="text/css"
href="https://giro3d.org/next/css/example.css"
/>
</head>
<body>
<div id="viewerDiv" class="m-0 p-0 w-100 h-100"></div>
<div id="panelDiv" class="position-absolute top-0 start-0 mh-100 overflow-auto"></div>
<script type="module" src="index.js"></script>
<script>
/* activate popovers */
const popoverTriggerList = [].slice.call(
document.querySelectorAll('[data-bs-toggle="popover"]'),
);
popoverTriggerList.map(
// bootstrap is used as script in the template, disable warning about undef
// eslint-disable-next-line no-undef
popoverTriggerEl =>
new bootstrap.Popover(popoverTriggerEl, {
trigger: 'hover',
placement: 'left',
content: document.getElementById(
popoverTriggerEl.getAttribute('data-bs-content'),
).innerHTML,
html: true,
}),
);
</script>
</body>
</html>
{
"name": "tifftiles",
"dependencies": {
"@turf/turf": "^6.5.0",
"@giro3d/giro3d": "git+https://gitlab.com/giro3d/giro3d.git"
},
"devDependencies": {
"vite": "^3.2.3"
},
"scripts": {
"start": "vite",
"build": "vite build"
}
}