mirror of https://gitee.com/antv-l7/antv-l7
62 lines
1.5 KiB
JavaScript
62 lines
1.5 KiB
JavaScript
import { Scene } from '@l7/scene';
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import { RasterLayer } from '@l7/layers'
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import * as GeoTIFF from 'geotiff';
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const scene = new Scene({
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id: 'map',
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pitch: 0,
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type: 'mapbox',
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style: 'light',
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center: [121.2680, 30.3628],
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zoom: 3,
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});
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async function getTiffData() {
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const response = await fetch(
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'https://gw.alipayobjects.com/os/rmsportal/XKgkjjGaAzRyKupCBiYW.dat',
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);
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const arrayBuffer = await response.arrayBuffer();
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const tiff = await GeoTIFF.fromArrayBuffer(arrayBuffer);
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const image = await tiff.getImage();
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const width = image.getWidth();
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const height = image.getHeight();
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const values = await image.readRasters();
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return {
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data: values[0],
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width,
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height,
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min: 0,
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max: 8000,
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};
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}
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async function addLayer() {
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const tiffdata = await getTiffData();
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const layer = new RasterLayer({});
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layer
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.source(tiffdata.data, {
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parser: {
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type: 'raster',
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width: tiffdata.width,
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height: tiffdata.height,
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min: 0,
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max: 8000,
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extent: [73.482190241, 3.82501784112, 135.106618732, 57.6300459963],
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},
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})
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.style({
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heightRatio:100,
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opacity: 0.8,
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rampColors: {
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colors: [ '#FF4818', '#F7B74A', '#FFF598', '#91EABC', '#2EA9A1', '#206C7C' ].reverse(),
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positions: [0, 0.2, 0.4, 0.6, 0.8, 1.0]
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},
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});
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return layer;
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}
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scene.on('loaded', async () =>{
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const layer = await addLayer();
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scene.addLayer(layer);
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scene.render();
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})
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