Limit the display of a color layer or a map within an elevation range.
By passing the elevationRange
option to the ColorLayer
and/or Map
constructor, you can limit the visibility of this layer/map within this range. A possible use case is to limit the display of a satellite layer above the sea level, then limit the display of a bathymetry dataset below the sea level.
import colormap from "colormap";
import XYZ from "ol/source/XYZ.js";
import { Color, 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 TiledImageSource from "@giro3d/giro3d/sources/TiledImageSource.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 ColorMap from "@giro3d/giro3d/core/layer/ColorMap.js";
import MapboxTerrainFormat from "@giro3d/giro3d/formats/MapboxTerrainFormat.js";
function bindSlider(id, onChange) {
const element = document.getElementById(id);
if (!(element instanceof HTMLInputElement)) {
throw new Error(
"invalid binding element: expected HTMLInputElement, got: " +
element.constructor.name,
);
}
element.oninput = function oninput() {
onChange(element.valueAsNumber);
};
const setValue = (v) => {
element.valueAsNumber = v;
onChange(element.valueAsNumber);
};
const initialValue = element.valueAsNumber;
return [setValue, initialValue, element];
}
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];
}
function makeColorRamp(
preset,
discrete = false,
invert = false,
mirror = false,
) {
let nshades = discrete ? 10 : 256;
// eslint-disable-next-line no-undef
const values = colormap({ colormap: preset, nshades });
// eslint-disable-next-line no-undef
const colors = values.map((v) => new Color(v));
if (invert) {
colors.reverse();
}
if (mirror) {
const mirrored = [...colors, ...colors.reverse()];
return mirrored;
}
return colors;
}
const center = { x: -13601505, y: 5812315 };
const extent = Extent.fromCenterAndSize("EPSG:3857", center, 20000, 20000);
const instance = new Instance({
target: "view",
crs: extent.crs,
backgroundColor: null,
});
const map = new Map({
extent,
elevationRange: { min: 500, max: 3000 },
});
instance.add(map);
const colorRamp = makeColorRamp("viridis");
const key =
"pk.eyJ1IjoidG11Z3VldCIsImEiOiJjbGJ4dTNkOW0wYWx4M25ybWZ5YnpicHV6In0.KhDJ7W5N3d1z3ArrsDjX_A";
// Adds a XYZ elevation layer with MapBox terrain RGB tileset
const elevationLayer = new ElevationLayer({
name: "xyz_elevation",
extent,
source: new TiledImageSource({
format: new MapboxTerrainFormat(),
source: new XYZ({
url: `https://api.mapbox.com/v4/mapbox.terrain-rgb/{z}/{x}/{y}.pngraw?access_token=${key}`,
projection: extent.crs,
crossOrigin: "anonymous",
}),
}),
colorMap: new ColorMap(colorRamp, 700, 2500),
});
map.addLayer(elevationLayer);
// Adds a XYZ color layer with MapBox satellite tileset
const colorLayer = new ColorLayer({
name: "xyz_color",
extent,
source: new TiledImageSource({
source: new XYZ({
url: `https://api.mapbox.com/v4/mapbox.satellite/{z}/{x}/{y}.webp?access_token=${key}`,
projection: extent.crs,
crossOrigin: "anonymous",
}),
}),
elevationRange: { min: 500, max: 3000 },
});
map.addLayer(colorLayer);
// Sets the camera position
instance.view.camera.position.set(-13615016, 5835706, 14797);
const controls = new MapControls(instance.view.camera, instance.domElement);
controls.target = new Vector3(-13603869, 5814829, 0);
controls.saveState();
controls.enableDamping = true;
controls.dampingFactor = 0.2;
controls.maxPolarAngle = Math.PI / 2.3;
instance.view.setControls(controls);
Inspector.attach("inspector", instance);
let colorLayerRange = colorLayer.elevationRange;
bindToggle("toggle-colorlayer-range", (enabled) => {
if (enabled) {
colorLayer.elevationRange = colorLayerRange;
} else {
colorLayer.elevationRange = null;
}
document.getElementById("layerMin").disabled = !enabled;
document.getElementById("layerMax").disabled = !enabled;
instance.notifyChange(map);
});
bindSlider("mapMin", (v) => {
map.elevationRange.min = v;
instance.notifyChange(map);
});
bindSlider("mapMax", (v) => {
map.elevationRange.max = v;
instance.notifyChange(map);
});
bindSlider("layerMin", (v) => {
colorLayer.elevationRange = { min: v, max: colorLayer.elevationRange.max };
colorLayerRange = colorLayer.elevationRange;
instance.notifyChange(map);
});
bindSlider("layerMax", (v) => {
colorLayer.elevationRange = { min: colorLayer.elevationRange.min, max: v };
colorLayerRange = colorLayer.elevationRange;
instance.notifyChange(map);
});
<!doctype html>
<html lang="en">
<head>
<title>Elevation ranges</title>
<meta charset="UTF-8" />
<meta name="name" content="elevation_ranges" />
<meta
name="description"
content="Limit the display of a color layer or a map within an elevation range."
/>
<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"
/>
<style>
#view canvas {
background-image: linear-gradient(45deg, #aaaaaa 25%, transparent 25%),
linear-gradient(-45deg, #aaaaaa 25%, transparent 25%),
linear-gradient(45deg, transparent 75%, #aaaaaa 75%),
linear-gradient(-45deg, transparent 75%, #aaaaaa 75%);
background-size: 20px 20px;
background-position:
0 0,
0 10px,
10px -10px,
-10px 0px;
}
</style>
</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="mh-100 overflow-y-auto">
<div class="card mb-1">
<div class="card-header">Per-map range</div>
<fieldset class="container card-body" id="options">
<label for="mapMin" class="form-label">Lower bound</label>
<div class="input-group">
<input
type="range"
min="500"
max="3000"
value="500"
class="form-range"
id="mapMin"
autocomplete="off"
/>
</div>
<div class="my-2"></div>
<label for="mapMax" class="form-label">Upper bound</label>
<div class="input-group">
<input
type="range"
min="500"
max="3000"
value="3000"
class="form-range"
id="mapMax"
autocomplete="off"
/>
</div>
</fieldset>
</div>
<div class="card mb-1">
<div class="card-header">Per-layer range (color layer only)</div>
<fieldset class="container card-body" id="options">
<!-- Toggle elevation range feature -->
<div class="form-check form-switch">
<input
class="form-check-input"
type="checkbox"
checked="true"
role="switch"
id="toggle-colorlayer-range"
autocomplete="off"
/>
<label class="form-check-label" for="toggle-colorlayer-range"
>Enable elevation range</label
>
</div>
<label for="layerMin" class="form-label">Lower bound</label>
<div class="input-group">
<input
type="range"
min="500"
max="3000"
value="500"
class="form-range"
id="layerMin"
autocomplete="off"
/>
</div>
<div class="my-2"></div>
<label for="layerMax" class="form-label">Upper bound</label>
<div class="input-group">
<input
type="range"
min="500"
max="3000"
value="3000"
class="form-range"
id="layerMax"
autocomplete="off"
/>
</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": "elevation_ranges",
"dependencies": {
"colormap": "^2.3.2",
"@giro3d/giro3d": "git+https://gitlab.com/giro3d/giro3d.git"
},
"devDependencies": {
"vite": "^3.2.3"
},
"scripts": {
"start": "vite",
"build": "vite build"
}
}