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// 天地图影像服务
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import { WebMapTileServiceImageryProvider } from 'cesium'
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//地图服务枚举类型：_c为墨卡托投影，_w为经纬度投影
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enum TDTLayerType {
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Vec = 'vec', //矢量底图
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Cva = 'cva', //矢量注记
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Img = 'img', //影像底图
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Cia = 'cia', //影像注记
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Ter = 'ter', //地形晕渲
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Cta = 'cta', //地形注记
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Ibo = 'ibo', //全球境界
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}
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enum TDTProjectionType {
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WebMercator = 'w',
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WGS84 = 'c',
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}
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//天地图token
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const TDT_tk = '1c5b7cbf9da7d33b221f68c32b6a1791'
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// 服务域名
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const tdtUrl = 'https://t{s}.tianditu.gov.cn'
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// 服务负载子域
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const subdomains = ['0', '1', '2', '3', '4', '5', '6', '7']
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/**
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* 获取天地图影像服务
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* @param layerType :影像类型
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* @param projectionType :投影类型，注WGS84下有问题
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* @param minimumLevel :最小缩放级别
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* @param maximumLevel :最大缩放级别
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* @returns :ImageryProvider
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*/
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export function getTDTProvider(
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layerType: string,
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projectionType: string,
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minimumLevel: number = 0,
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maximumLevel: number = 18,
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) {
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// 切片方式
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const tilingScheme =
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projectionType == TDTProjectionType.WGS84
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? new Cesium.GeographicTilingScheme()
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: new Cesium.WebMercatorTilingScheme()
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const tileMatrixLabels =
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projectionType == TDTProjectionType.WGS84
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? new Array(19).fill(1).map((v, i) => `${i}`)
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: undefined
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const imageryProvider = new WebMapTileServiceImageryProvider({
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//影像底图
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url:
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`${tdtUrl}/DataServer?T=${layerType}_${projectionType}&x={TileCol}&y={TileRow}&l={TileMatrix}&tk=` +
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TDT_tk,
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subdomains: subdomains, //天地图8个服务器
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minimumLevel: minimumLevel, //定义最小缩放级别
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maximumLevel: maximumLevel, //定义最大缩放级别
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layer: layerType,
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style: 'default',
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format: 'tiles',
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tileMatrixSetID: projectionType, //'GoogleMapsCompatible', //使用谷歌的瓦片切片方式
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tilingScheme: tilingScheme,
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tileMatrixLabels: tileMatrixLabels,
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})
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return imageryProvider
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}
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/**
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* 获取天地图三维地形服务
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* @returns ImageryProvider
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*/
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export function getTDTTerrainProvider() {
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const terrainUrls: string[] = []
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for (let i = 0; i < subdomains.length; i++) {
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const url =
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tdtUrl.replace('{s}', subdomains[i]) +
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'/mapservice/swdx?T=elv_c&tk=' +
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TDT_tk
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terrainUrls.push(url)
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}
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const provider = new Cesium.GeoTerrainProvider({
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urls: terrainUrls,
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})
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return provider
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}
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export { TDTLayerType, TDTProjectionType }
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