概述

本文是一片”水文”，记录一下如何在ubuntu中用tippecanoe制作矢量切片。

实现操作

本示例中ubuntu是在VMware虚拟机中，安装的是18.04.6的版本，你可通过我兰的镜像下载，速度杠杠的。

1.安装git

sudo apt install git

2.clone代码

git clone https://gitee.com/lzugis15/tippecanoe.git

3. make

sudo apt install make      
sudo apt install make-guile

4. g++

sudo apt install g++

5. 其他

// 解决fatal error:sqlite3.h错误
sudo apt-get install libsqlite3-dev

// 解决fatal error:zlib.h错误
sudo apt-get install zlib1g-dev

6. make & install

make
sudo make install

make

install

7. 切片

经过上面的步骤，安装工作完成了，下面通过一个简单的示例做个切片并验证一下。

tippecanoe -zg -Z2 -o province.mbtiles --coalesce-densest-as-needed --extend-zooms-if-still-dropping province.geojson

说明：

-zg，最大级别，如果为g，则表示自动计算；
-Z2，最小级别；
-o，指定输出文件名；
更多详细配置请参阅源代码说明。

8.验证

用node写一个mbtile服务器加以验证。

// 初始化工程
npm init -y
// 添加依赖
npm i @mapbox/mbtiles express -S

新建一个service.js，代码如下：

const express = require("express"), MBTiles = require('@mapbox/mbtiles');

const app = express()

// 自定义跨域中间件
const allowCors = function (req, res, next) {
  res.header('Access-Control-Allow-Origin', req.headers.origin);
  res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');
  res.header('Access-Control-Allow-Headers', 'Content-Type');
  res.header('Access-Control-Allow-Credentials', 'true');
  next();
};
app.use(allowCors);//使用跨域中间件

const port = 13000;
const mbtilesLocation = 'D:\\tile\\vector\\province.mbtiles';

/* Set return header*/
function getContentType(t) {
  let header = {};
  /* Cache*/
  if (t === "json") {
    header["Content-Type"] = "application/json";
    header["Cache-Control"] = "public, max-age=3600";
  }
  /* request specific headers*/
  if (t === "png") {
    header["Content-Type"] = "image/png";
    header["Cache-Control"] = "public, max-age=604800";
  }
  if (t === "jpg") {
    header["Content-Type"] = "image/jpeg";
    header["Cache-Control"] = "public, max-age=604800";
  }
  if (t === "pbf") {
    header["Content-Type"] = "application/octet-stream";
    header["Content-Encoding"] = "gzip";
    header["Cache-Control"] = "public, max-age=604800";
  }

  return header;
}

new MBTiles(mbtilesLocation, function (err, mbtiles) {
  if (err) throw err;
  app.get('/:z/:x/:y.*', function (req, res) {
    const { params } = req
    const { x, y, z } = params
    const extension = params['0']
    res.set(getContentType(extension))
    mbtiles.getTile(z, x, y, function (err, tile, headers) {
      if (err) {
        res.status(404).send('Tile rendering error: ' + err + '\n')
      } else {
        res.send(tile);
      }
    });
  });
});

// actually create the server
app.listen(port, () => {
  console.log(`server started, visit http://localhost:${[port]}`)
});

新建一个map.html，代码如下：

<!DOCTYPE html>
<html>
<head>
    <title>Mapbox GL</title>
    <meta charset='utf-8'>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
    <link rel="stylesheet" href="lib/mapbox-gl.css" type="text/css">
    <style>
        body { margin: 0; padding: 0; }
        html, body, #map { height: 100%; overflow: hidden }
    </style>
</head>

<body>
<div id='map'></div>
<script src="./lib/mapbox-gl.js"></script>
<script>
    const style = {
        "version": 8,
        "name": "Mapbox Streets",
        "sources": {
            "amap-tile": {
                "type": "raster",
                "scheme": "xyz",
                "tiles": [
                    'http://webrd01.is.autonavi.com/appmaptile?x={x}&y={y}&z={z}&lang=zh_cn&size=1&scale=1&style=8',
                    'http://webrd02.is.autonavi.com/appmaptile?x={x}&y={y}&z={z}&lang=zh_cn&size=1&scale=1&style=8',
                    'http://webrd03.is.autonavi.com/appmaptile?x={x}&y={y}&z={z}&lang=zh_cn&size=1&scale=1&style=8',
                    'http://webrd04.is.autonavi.com/appmaptile?x={x}&y={y}&z={z}&lang=zh_cn&size=1&scale=1&style=8',
                ],
                "tileSize": 256
            }
        },
        "layers": [
            {
                "id": "amap-tile",
                "type": "raster",
                "source": "amap-tile",
                "minzoom": 0,
                "maxzoom": 17
            }
        ]
    }
    var map = new mapboxgl.Map({
        container: 'map',
        style: style,
        center: [107.11040599933166, 34.26271532332011],
        zoom: 3
    });

    map.on('load', () => {
        map.addSource('geoserver-tile', {
            "type": "vector",
            "scheme": "xyz",
            "tiles": [
                'http://localhost:13000/{z}/{x}/{y}.pbf'
                // 'http://localhost:63344/sfmap/tile/china/{z}/{x}/{y}.pbf'
            ]
        })
        map.addLayer({
            id: 'geoserver-tile-line',
            type: 'line',
            source: 'geoserver-tile',
            // 'source-layer': 'layer_province',
            'source-layer': 'province',
            paint: {
                'line-color': '#f00',
                'line-width': 1,
                'line-opacity': 1
            }
        })
        map.addLayer({
            id: 'geoserver-tile-line1',
            type: 'fill',
            source: 'geoserver-tile',
            // 'source-layer': 'layer_province',
            'source-layer': 'city_gd',
            paint: {
                'fill-color': '#3c80f6',
                'fill-opacity': 0.2
            }
        })
    })
</script>
</body>
</html>