82 lines
1.9 KiB
JavaScript
82 lines
1.9 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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const source = new GeoTIFF({
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sources: [
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{
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// visible red, band 1 in the style expression above
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url: 'https://sentinel-cogs.s3.us-west-2.amazonaws.com/sentinel-s2-l2a-cogs/2020/S2A_36QWD_20200701_0_L2A/B04.tif',
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max: 10000,
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},
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{
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// near infrared, band 2 in the style expression above
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url: 'https://sentinel-cogs.s3.us-west-2.amazonaws.com/sentinel-s2-l2a-cogs/2020/S2A_36QWD_20200701_0_L2A/B08.tif',
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max: 10000,
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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: [
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new TileLayer({
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style: {
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color: [
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'interpolate',
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['linear'],
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// calculate NDVI, bands come from the sources below
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[
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'/',
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['-', ['band', 2], ['band', 1]],
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['+', ['band', 2], ['band', 1]],
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],
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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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source: source,
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}),
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],
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view: source.getView(),
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});
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