Add and remove layers in a Map.

Add / Remove
?

Toggling a layer removes / adds it to the map.

100% Map style by Stamen Design, © OpenStreetMap contributors

Use the addLayer() and removeLayer() methods to add and remove layers in a Map.

index.js
import { Vector3 } from 'three';
import { MapControls } from 'three/examples/jsm/controls/MapControls.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 WmtsSource from '@giro3d/giro3d/sources/WmtsSource.js';
import ElevationLayer from '@giro3d/giro3d/core/layer/ElevationLayer.js';
import BilFormat from '@giro3d/giro3d/formats/BilFormat.js';

Instance.registerCRS(
    'EPSG:2154',
    '+proj=lcc +lat_0=46.5 +lon_0=3 +lat_1=49 +lat_2=44 +x_0=700000 +y_0=6600000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs',
);
Instance.registerCRS(
    'IGNF:WGS84G',
    'GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]',
);
const extent = new Extent('EPSG:2154', -111629.52, 1275028.84, 5976033.79, 7230161.64);

// `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: 0x000000,
    },
});

// Instanciates camera
const camPos = new Vector3(220295, 6810219, 409065);
instance.camera.camera3D.position.set(camPos.x, camPos.y, camPos.z);

// Instanciates controls
const controls = new MapControls(instance.camera.camera3D, instance.domElement);

controls.target.set(camPos.x, camPos.y + 1, 0);
instance.useTHREEControls(controls);

const map = new Map('map', {
    extent,
    backgroundColor: 'gray',
    maxSubdivisionLevel: 13,
    hillshading: {
        enabled: true,
        zFactor: 8,
    },
    terrain: false,
});
instance.add(map);

const capabilitiesUrl =
    'https://data.geopf.fr/wmts?SERVICE=WMTS&VERSION=1.0.0&REQUEST=GetCapabilities';

let layers = {};

WmtsSource.fromCapabilities(capabilitiesUrl, {
    layer: 'HR.ORTHOIMAGERY.ORTHOPHOTOS',
})
    .then(orthophotoWmts => {
        const layer = new ColorLayer({
            name: 'orthophotos',
            extent: map.extent,
            source: orthophotoWmts,
        });
        layers['orthophotos'] = layer;
        layer.userData.zOrder = 0;
        map.addLayer(layer);
    })
    .catch(console.error);

WmtsSource.fromCapabilities(capabilitiesUrl, {
    layer: 'GEOGRAPHICALGRIDSYSTEMS.PLANIGNV2',
})
    .then(planIgn => {
        const layer = new ColorLayer({
            name: 'plan',
            extent: map.extent,
            source: planIgn,
            opacity: 0.2,
        });
        layers['plan'] = layer;
        layer.userData.zOrder = 1;
        map.addLayer(layer);
    })
    .catch(console.error);

WmtsSource.fromCapabilities(capabilitiesUrl, {
    layer: 'ELEVATION.ELEVATIONGRIDCOVERAGE.HIGHRES',
    format: new BilFormat(),
    noDataValue: -1000,
})
    .then(elevationWmts => {
        const layer = new ElevationLayer({
            name: 'terrain',
            extent: map.extent,
            // We don't need the full resolution of terrain because we are not using any shading
            resolutionFactor: 0.5,
            minmax: { min: 0, max: 5000 },
            noDataOptions: {
                replaceNoData: false,
            },
            source: elevationWmts,
        });
        layers['terrain'] = layer;
        map.addLayer(layer);
    })
    .catch(console.error);

function bindToggle(layerName) {
    const toggle = document.getElementById(layerName);
    toggle.oninput = () => {
        const state = toggle.checked;
        if (state) {
            map.addLayer(layers[layerName]);
        } else {
            map.removeLayer(layers[layerName]);
        }
        map.sortColorLayers((a, b) => a.userData.zOrder - b.userData.zOrder);
        instance.notifyChange(map);
    };
}

bindToggle('terrain');
bindToggle('plan');
bindToggle('orthophotos');

Inspector.attach(document.getElementById('panelDiv'), instance);
index.html
<!doctype html>
<html lang="en">
    <head>
        <title>Add / Remove layers</title>
        <meta charset="UTF-8" />
        <meta name="name" content="add_remove_layers" />
        <meta name="description" content="Add and remove layers in a Map." />
        <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/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>

        <div class="side-pane-with-status-bar">
            <div class="card">
                <h5 class="card-header">Add / Remove</h5>

                <!-- tooltip -->
                <span
                    class="badge bg-secondary position-absolute top-0 end-0 m-2"
                    data-bs-toggle="popover"
                    data-bs-content="tooltip"
                    >?</span
                >

                <p class="card-text d-none" id="tooltip">Toggling a layer removes / adds it to the map.</p>

                <div class="card-body">
                    <fieldset class="container m-1">
                        <div class="form-check form-switch">
                            <input
                                class="form-check-input"
                                type="checkbox"
                                checked="true"
                                role="switch"
                                id="plan"
                                autocomplete="off"
                            />
                            <label class="form-check-label" for="plan">Plan</label>
                        </div>
                        <div class="form-check form-switch">
                            <input
                                class="form-check-input"
                                type="checkbox"
                                checked="true"
                                role="switch"
                                id="orthophotos"
                                autocomplete="off"
                            />
                            <label class="form-check-label" for="orthophotos">Orthophoto</label>
                        </div>
                        <div class="form-check form-switch">
                            <input
                                class="form-check-input"
                                type="checkbox"
                                checked="true"
                                role="switch"
                                id="terrain"
                                autocomplete="off"
                            />
                            <label class="form-check-label" for="terrain">Terrain</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>
package.json
{
    "name": "add_remove_layers",
    "dependencies": {
        "@giro3d/giro3d": "0.37.2"
    },
    "devDependencies": {
        "vite": "^3.2.3"
    },
    "scripts": {
        "start": "vite",
        "build": "vite build"
    }
}