---
title: "标准假彩色"
language: "en"
canonical: "https://l7.antv.antgroup.com/en/examples/raster/rgb/543/"
---

# 标准假彩色

[Live example](https://l7.antv.antgroup.com/en/examples/raster/rgb/543/)

[Resource index](/llms.txt)

Provide a DOM element with `id="container"`. The original example source follows.

## Source

```ts
// @ts-ignore
import { RasterLayer, Scene } from '@antv/l7';
// @ts-ignore
import { Map } from '@antv/l7-maps';
import * as GeoTIFF from 'geotiff';

async function getTiffData(url: string) {
  const response = await fetch(url);
  const arrayBuffer = await response.arrayBuffer();
  const tiff = await GeoTIFF.fromArrayBuffer(arrayBuffer);
  const image1 = await tiff.getImage();
  const bandsValues = await image1.readRasters();
  return bandsValues;
}

const scene = new Scene({
  id: 'map',
  map: new Map({
    center: [130.5, 47],
    zoom: 10.5,
  }),
});

scene.on('loaded', async () => {
  const url2 = 'https://t0.tianditu.gov.cn/img_w/wmts?tk=b72aa81ac2b3cae941d1eb213499e15e&';

  const layer2 = new RasterLayer({
    zIndex: 1,
  }).source(url2, {
    parser: {
      type: 'rasterTile',
      tileSize: 256,
      wmtsOptions: {
        layer: 'img',
        tileMatrixset: 'w',
        format: 'tiles',
      },
    },
  });
  scene.addLayer(layer2);
  const url1 = 'https://gw.alipayobjects.com/zos/raptor/1667832825992/LC08_3857_clip_2.tif';
  const bandsValues = await getTiffData(url1);

  const layer = new RasterLayer({ zIndex: 10 });
  layer
    .source(bandsValues, {
      parser: {
        type: 'rgb',
        width: bandsValues.width,
        height: bandsValues.height,
        bands: [4, 3, 2], // 从零开始
        extent: [130.39565357746957, 46.905730725742366, 130.73364094187343, 47.10217234153133],
      },
    })
    .style({
      opacity: 1,
    });
  scene.addLayer(layer);
});
```

## Runtime environment

Before evaluating the example, await this setup in a page containing #container. Supporting files follow below.

```js
await (await import("/src/demo/setup.ts")).default({ container: document.getElementById('container'), path: "/examples/raster/rgb/demo/543.ts" });
```


## src/demo/setup.ts

```ts
import type { DemoSetupContext } from '@antv/astro-theme-antv';
import * as District from 'district-data';
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js';

export default async function setup({ container, path }: DemoSetupContext) {
  // Tool pages provide their own React layout and SDK imports.
  if (!path.startsWith('/examples/')) return;
  // Retain only the original globals still used by gallery examples.
  Object.assign(window, { District, GLTFLoader });
  const map = document.createElement('div');
  map.id = 'map';
  container.append(map);
  await import('./map.css');
  // Match the original gallery's shared AMap environment, including raw AMap demos.
  await import('./amap');
}
```

## src/demo/map.css

```css
#map {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 320px;
}

.labelclass {
  position: absolute;
  display: inline;
  cursor: pointer;
  background: rgb(255, 228, 120);
  border: solid 2px #fff;
  padding: 4px;
  white-space: nowrap;
  font:
    bold 12px/18px arial,
    sans-serif;
  color: #fff;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  line-height: 30px;
  /* opacity: 0.7; */
  text-align: center;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
```

## src/demo/amap.ts

```ts
import AMapLoader from '@amap/amap-jsapi-loader';

// Preserve the site's development and production SDK registrations.
const credentials = import.meta.env.DEV
  ? { key: '6f025e700cbacbb0bb866712d20bb35c', securityJsCode: '290ddc4b0d33be7bc9b354bc6a4ca614' }
  : { key: 'f59bcf249433f8b05caaee19f349b3d7', securityJsCode: '2653011adeb04230b3a26cc9a780a800' };
window._AMapSecurityConfig = { securityJsCode: credentials.securityJsCode };
await AMapLoader.load({ key: credentials.key, version: '2.0', plugins: ['Map3D'] });
```