mirror of https://gitee.com/antv-l7/antv-l7
60 lines
1.6 KiB
JavaScript
60 lines
1.6 KiB
JavaScript
// https://gw.alipayobjects.com/zos/antvdemo/assets/2019_clip/ndvi_201905.tif
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import { RasterLayer, Scene } from '@antv/l7';
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import { GaodeMap } from '@antv/l7-maps';
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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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map: new GaodeMap({
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style: 'dark',
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center: [ 105, 37.5 ],
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zoom: 2.5
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})
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});
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scene.on('loaded', () => {
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addLayer();
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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/zos/antvdemo/assets/light_clip/lightF182013.tiff'
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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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};
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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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extent: [ 73.4821902409999979, 3.8150178409999995, 135.1066187319999869, 57.6300459959999998 ]
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}
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})
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.style({
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clampLow: false,
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clampHigh: false,
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domain: [ 0, 90 ],
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nodataValue: 0,
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rampColors: {
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type:'linear', // 2.13.0 及以后版本支持
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colors: ['rgba(92,58,16,0)','rgba(92,58,16,0)', '#fabd08', '#f1e93f', '#f1ff8f', '#fcfff7' ],
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positions: [0,3, 9, 22.5, 45, 90 ]
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}
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});
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scene.addLayer(layer);
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}
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