Stack multiple WMTS layers into a single Giro3D layer.
The AggregateImageSource can combine multiple ImageSources into one. One the many benefits of this approach is that is reduces the number of layers in a map, which helps improve performance. In this example, we display seveveral WMTS layers in a single Map layer.
import { MapControls } from "three/examples/jsm/controls/MapControls.js";
import Coordinates from "@giro3d/giro3d/core/geographic/Coordinates.js";
import CoordinateSystem from "@giro3d/giro3d/core/geographic/CoordinateSystem.js";
import Extent from "@giro3d/giro3d/core/geographic/Extent.js";
import Instance from "@giro3d/giro3d/core/Instance.js";
import ColorLayer from "@giro3d/giro3d/core/layer/ColorLayer.js";
import Map from "@giro3d/giro3d/entities/Map.js";
import Inspector from "@giro3d/giro3d/gui/Inspector.js";
import AggregateImageSource from "@giro3d/giro3d/sources/AggregateImageSource.js";
import WmtsSource from "@giro3d/giro3d/sources/WmtsSource.js";
function bindToggle(id, onChange) {
const element = document.getElementById(id);
if (!(element instanceof HTMLInputElement)) {
throw new Error(
"invalid binding element: expected HTMLButtonElement, got: " +
element.constructor.name,
);
}
element.oninput = function oninput() {
onChange(element.checked);
};
const callback = (v) => {
element.checked = v;
onChange(element.checked);
};
return [callback, element.checked, element];
}
const crs = CoordinateSystem.epsg3857;
const lowerLeft = new Coordinates(crs, -571790, 5144751);
const upperRight = new Coordinates(crs, 961225, 6577787);
const extent = new Extent(
crs,
lowerLeft.x,
upperRight.x,
lowerLeft.y,
upperRight.y,
);
const center = extent.centerAsVector3();
const instance = new Instance({
target: "view",
crs: extent.crs,
});
instance.view.camera.position.set(center.x, center.y - 1, 5_000_000);
const controls = new MapControls(instance.view.camera, instance.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.2;
controls.target.copy(extent.centerAsVector3());
instance.view.setControls(controls);
const map = new Map({ extent, backgroundColor: "gray" });
instance.add(map);
// Define WMTS layers
const wmtsLayers = [
{ layer: "TRANSPORTNETWORKS.ROADS", imageFormat: "image/png", zIndex: 2 },
{ layer: "ADMINEXPRESS-COG.LATEST", imageFormat: "image/png", zIndex: 1 },
{
layer: "ORTHOIMAGERY.ORTHOPHOTOS.BDORTHO",
imageFormat: "image/jpeg",
zIndex: 0,
},
];
let sources = [];
let aggregateSource;
async function loadLayers() {
const capabilities =
"https://data.geopf.fr/wmts?SERVICE=WMTS&VERSION=1.0.0&REQUEST=GetCapabilities";
const promises = wmtsLayers
// Sort by z-index so that they appear in the correct order in the stack
.sort((a, b) => a.zIndex - b.zIndex)
.map(({ layer, imageFormat }) =>
// Create a WMTS source from the layer name
WmtsSource.fromCapabilities(capabilities, { layer, imageFormat }),
);
sources = await Promise.all(promises);
// Let's build the aggregate source that combines all WMTS sources
aggregateSource = new AggregateImageSource({ sources });
await map.addLayer(new ColorLayer({ source: aggregateSource }));
for (let i = 0; i < wmtsLayers.length; i++) {
const name = wmtsLayers[i].layer;
// Bind the example GUI to each source
bindToggle(name, (show) =>
aggregateSource.setSourceVisibility(sources[i], show),
);
}
}
loadLayers();
// Attach the inspector
Inspector.attach("inspector", instance);
<!doctype html>
<html lang="en">
<head>
<title>Stacked WMTS layers</title>
<meta charset="UTF-8" />
<meta name="name" content="multiple-wmts-layers" />
<meta
name="description"
content="Stack multiple WMTS layers into a single Giro3D layer."
/>
<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/latest/examples/css/example.css"
/>
</head>
<body>
<div id="view" class="m-0 p-0 w-100 h-100"></div>
<div
id="inspector"
class="position-absolute top-0 start-0 mh-100 overflow-auto"
></div>
<div class="side-pane-with-status-bar">
<div class="card">
<div class="card-header">Sources</div>
<div class="card-body">
<fieldset id="options">
<!-- TRANSPORTNETWORKS.ROADS -->
<div class="form-check form-switch">
<input
class="form-check-input"
type="checkbox"
checked="true"
role="switch"
id="TRANSPORTNETWORKS.ROADS"
autocomplete="off"
/>
<label class="form-check-label" for="show-top-source"
>TRANSPORTNETWORKS.ROADS</label
>
</div>
<!-- ADMINEXPRESS-COG.LATEST -->
<div class="form-check form-switch">
<input
class="form-check-input"
type="checkbox"
checked="true"
role="switch"
id="ADMINEXPRESS-COG.LATEST"
autocomplete="off"
/>
<label class="form-check-label" for="show-top-source"
>ADMINEXPRESS-COG.LATEST</label
>
</div>
<!-- ORTHOIMAGERY.ORTHOPHOTOS.BDORTHO -->
<div class="form-check form-switch">
<input
class="form-check-input"
type="checkbox"
checked="true"
role="switch"
id="ORTHOIMAGERY.ORTHOPHOTOS.BDORTHO"
autocomplete="off"
/>
<label class="form-check-label" for="show-top-source"
>ORTHOIMAGERY.ORTHOPHOTOS.BDORTHO</label
>
</div>
</fieldset>
</div>
</div>
</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": "multiple-wmts-layers",
"dependencies": {
"@giro3d/giro3d": "1.0.0"
},
"devDependencies": {
"vite": "^3.2.3"
},
"scripts": {
"start": "vite",
"build": "vite build"
}
}import { defineConfig } from "vite";
export default defineConfig({
build: {
target: 'esnext',
},
optimizeDeps: {
esbuildOptions: {
target: 'esnext',
},
},
})