Question

我尝试将OL5矢量图块与全局图块网格一起使用。

import 'ol/ol.css'
import { Map, View } from 'ol'
import MVT from 'ol/format/MVT'
import TileGrid from 'ol/tilegrid/TileGrid'
import VectorTileLayer from 'ol/layer/VectorTile'
import VectorTileSource from 'ol/source/VectorTile'

let zoom = 0
let center = [8531000, 5342500]
let resolutions = [
    9.554628535647032,
    4.777314267823516,
    2.388657133911758,
    1.19432856695588,
]
let extent = [0, 0, 20037508.342789244, 20037508.342789244]

const map = new Map({
    target: 'map',
    view: new View({
        zoom: zoom,    
        center: center,
        resolutions: resolutions,
   })     
})

const vectorTiles = new VectorTileLayer({
    source: new VectorTileSource({
        tileSize: 256,
        projection: 'EPSG:3857',
        format: new MVT(),    
        tileGrid: new TileGrid({      
            extent: extent,          
            resolutions: resolutions,
        }),    
        url: 'http://localhost:8000/get-vector-tiles/{z}/{x}/{y}'
    })   
 })

 map.addLayer(vectorTiles)

请求看起来像http://localhost:8000/get-vector-tiles/0/3487/6007，据我了解，{x}/{y}是来自原点的图块的坐标（数字）（在我的情况下，0,0）。

起始分辨率为9.554628535647032，因此，磁贴大小为9.554628535647032 × 256 = 2445.984905126米

估算所需区域坐标：

X：2445.984905126 × 3487 = 8529149.3642

Y：2445.984905126 × 6007 = 14693031.2943

考虑到地图的中心为[8531000, 5342500]：

X坐标是正确的8529149.3642 ~ 8531000，而Y坐标与5342500 vs 14693031.2943

不匹配

怎么了？

Answer 1

解决了，问题是渲染从左上角开始，因此20037508.342789244 - 2445.984905126 × 6007 ~ 5342500，好吧！

OL5 VectorTileLayer：图块的Y坐标

1 个答案: