106 lines
2.0 KiB
JavaScript
106 lines
2.0 KiB
JavaScript
import GeoTIFF from '../src/ol/source/GeoTIFF.js';
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import Map from '../src/ol/Map.js';
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import TileLayer from '../src/ol/layer/WebGLTile.js';
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import View from '../src/ol/View.js';
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const max = 3000;
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function normalize(value) {
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return ['/', value, max];
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}
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const red = normalize(['band', 1]);
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const green = normalize(['band', 2]);
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const blue = normalize(['band', 3]);
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const nir = normalize(['band', 4]);
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const trueColor = {
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color: ['array', red, green, blue, 1],
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gamma: 1.1,
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};
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const falseColor = {
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color: ['array', nir, red, green, 1],
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gamma: 1.1,
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};
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const ndvi = {
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color: [
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'interpolate',
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['linear'],
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['/', ['-', nir, red], ['+', nir, red]],
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// color ramp for NDVI values, ranging from -1 to 1
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-0.2,
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[191, 191, 191],
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-0.1,
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[219, 219, 219],
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0,
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[255, 255, 224],
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0.025,
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[255, 250, 204],
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0.05,
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[237, 232, 181],
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0.075,
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[222, 217, 156],
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0.1,
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[204, 199, 130],
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0.125,
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[189, 184, 107],
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0.15,
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[176, 194, 97],
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0.175,
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[163, 204, 89],
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0.2,
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[145, 191, 82],
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0.25,
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[128, 179, 71],
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0.3,
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[112, 163, 64],
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0.35,
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[97, 150, 54],
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0.4,
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[79, 138, 46],
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0.45,
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[64, 125, 36],
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0.5,
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[48, 110, 28],
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0.55,
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[33, 97, 18],
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0.6,
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[15, 84, 10],
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0.65,
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[0, 69, 0],
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],
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};
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const layer = new TileLayer({
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style: trueColor,
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source: new GeoTIFF({
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normalize: false,
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sources: [
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{
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url: 'https://s2downloads.eox.at/demo/EOxCloudless/2020/rgbnir/s2cloudless2020-16bits_sinlge-file_z0-4.tif',
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},
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],
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}),
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});
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const map = new Map({
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target: 'map',
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layers: [layer],
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view: new View({
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projection: 'EPSG:4326',
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center: [0, 0],
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zoom: 2,
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maxZoom: 6,
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}),
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});
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const styles = {trueColor, falseColor, ndvi};
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const styleSelector = document.getElementById('style');
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function update() {
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const style = styles[styleSelector.value];
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layer.setStyle(style);
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}
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styleSelector.addEventListener('change', update);
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