mirror of https://gitee.com/antv-l7/antv-l7
60 lines
1.5 KiB
JavaScript
60 lines
1.5 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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pitch: 0,
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style: 'dark',
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center: [ 115.5268, 34.3628 ],
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zoom: 3
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})
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});
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addLayer();
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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/2019_clip/ndvi_201905.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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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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extent: [ 73.4766000000000048, 18.1054999999999993, 135.1066187, 57.6300460 ]
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}
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})
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.style({
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opacity: 0.8,
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clampLow: false,
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clampHigh: false,
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domain: [ -3000, 9000 ],
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rampColors: {
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colors: [ 'rgb(166,97,26)', 'rgb(223,194,125)', 'rgb(245,245,245)', 'rgb(128,205,193)', 'rgb(1,133,113)' ],
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positions: [ 0, 0.25, 0.5, 0.75, 1.0 ]
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}
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});
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scene.addLayer(layer);
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}
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