由于默认情况下的 GeoJSON 文件太大，ECharts 提供了方法可以压缩地图。

GeoJSON 介绍：http://geojson.org/

ECharts 提供了压缩算法，但是代码是 JavaScript 的，参考代码写个 Java 的也可以，但是通过 Java 提供的脚本引擎可以很方便的直接执行 JS。

本文压缩代码参考下面的项目：

https://github.com/giscafer/mapshaper-plus
这里的算法也是来源于 ECharts

从该项目提取出压缩地图的 JS 代码，简化后如下：

function convert2Echarts(rawStr,fileName,type){ var results=""; var json = JSON.parse(rawStr); // Meta tag json.UTF8Encoding = true; var features = json.features; if (!features) { return; } features.forEach(function (feature){ var encodeOffsets = feature.geometry.encodeOffsets = []; var coordinates = feature.geometry.coordinates; if (feature.geometry.type === 'Polygon') { coordinates.forEach(function (coordinate, idx){ coordinates[idx] = encodePolygon( coordinate, encodeOffsets[idx] = [] ); }); } else if(feature.geometry.type === 'MultiPolygon') { coordinates.forEach(function (polygon, idx1){ encodeOffsets[idx1] = []; polygon.forEach(function (coordinate, idx2) { coordinates[idx1][idx2] = encodePolygon( coordinate, encodeOffsets[idx1][idx2] = [] ); }); }); } }); if(type==='json'){ results=JSON.stringify(json); }else{ results=addEchartsJsWrapper(JSON.stringify(json), fileName); } return results;};function encodePolygon(coordinate, encodeOffsets) { var result = ''; var prevX = quantize(coordinate[0][0]); var prevY = quantize(coordinate[0][1]); // Store the origin offset encodeOffsets[0] = prevX; encodeOffsets[1] = prevY; for (var i = 0; i < coordinate.length; i++) { var point = coordinate[i]; result+=encode(point[0], prevX); result+=encode(point[1], prevY); prevX = quantize(point[0]); prevY = quantize(point[1]); } return result;}function addAMDWrapper(jsonStr) { return ['define(function() {', ' return ' + jsonStr + ';', '});'].join('\n');}function addEchartsJsWrapper(jsonStr,fileName) { return ['(function (root, factory) {', " if (typeof define === 'function' && define.amd) {", " define(['exports', 'echarts'], factory);", " } else if (typeof exports === 'object' && typeof exports.nodeName !== 'string') {", " factory(exports, require('echarts'));", " } else {", " factory({}, root.echarts);", " }", " }(this, function (exports, echarts) {", " var log = function (msg) {", " if (typeof console !== 'undefined') {", " console && console.error && console.error(msg);", " }", " }", " if (!echarts) {", " log('ECharts is not Loaded');", " return;", " }", " if (!echarts.registerMap) {", " log('ECharts Map is not loaded')", " return;", " }", " echarts.registerMap('"+fileName+"',"+ jsonStr, ' )}));'].join('\n');}function encode(val, prev){ // Quantization val = quantize(val); // var tmp = val; // Delta val = val - prev; if (((val << 1) ^ (val >> 15)) + 64 === 8232) { //WTF, 8232 will get syntax error in js code val--; } // ZigZag val = (val << 1) ^ (val >> 15); // add offset and get unicode return String.fromCharCode(val+64); // var tmp = {'tmp' : str}; // try{ // eval("(" + JSON.stringify(tmp) + ")"); // }catch(e) { // console.log(val + 64); // }}function quantize(val) { return Math.ceil(val * 1024);}

一个河北省的 GeoJSON 示例（文件大小为 55 kb）：

{"type": "FeatureCollection","cp":[115.4004,39.4688],"size":"1300","features":[{"type": "Feature","properties":{"id":"1308","name":"承德市","cp":[117.5757,41.4075],"childNum":11},"geometry":{"type":"Polygon","coordinates":[[[116.0815,41.781],[116.1035,41.7865],[116.1255,41.8085],[116.1035,41.8359],[116.1255,41.8689],[116.1584,41.8634],[116.1694,41.8744],[116.1914,41.8634],[116.2134,41.8799],[116.2134,41.8909],[116.2244,41.9183],[116.2354,41.9238],[116.2244,41.9293],[116.2244,41.9348],[116.3013,41.9733],[116.3123,41.9952],[116.3342,42.0062],[116.3672,42.0117],[116.4111,41.9952],[116.4111,41.9678],[116.3892,41.9458],[116.4331,41.9403],[116.4661,41.9568],[116.499,41.9843],[116.532,41.9568],[116.543,41.9348],[116.5869,41.9238],[116.5979,41.9348],[116.6418,41.9293],[116.6638,41.9458],[116.7188,41.9403],[116.7188,41.9623],[116.7297,41.9733],[116.7407,41.9897],[116.7737,41.9952],[116.7737,41.9843],[116.7957,41.9733],[116.8506,42.0062],[116.8726,42.0007],[116.8835,42.0227],[116.8726,42.0282],[116.8835,42.0557],[116.8835,42.0667],[116.8945,42.0831],[116.8945,42.1051],[116.8286,42.1655],[116.8066,42.1765],[116.7957,42.1875],[116.8176,42.204],[116.9055,42.1875],[116.9165,42.1985],[116.9165,42.2534],[116.9055,42.2699],[116.9055,42.2919],[116.8945,42.3083],[116.9055,42.3523],[116.9055,42.3688],[116.9055,42.3853],[116.9165,42.4017],[116.9714,42.4292],[117.0044,42.4292],[117.0154,42.4567],[117.0813,42.4622],[117.0923,42.4841],[117.1362,42.4677],[117.2021,42.4677],[117.2791,42.4841],[117.334,42.4622],[117.3889,42.4622],[117.4109,42.4731],[117.3999,42.5116],[117.3999,42.5226],[117.4219,42.5226],[117.4329,42.5116],[117.4658,42.5171],[117.4768,42.5336],[117.4768,42.583],[117.4878,42.594],[117.5317,42.5885],[117.5427,42.5995],[117.5537,42.605],[117.5757,42.583],[117.6306,42.5665],[117.8064,42.616],[117.8064,42.5995],[117.7954,42.594],[117.8064,42.5775],[117.8394,42.561],[117.8613,42.5391],[117.8723,42.4951],[117.9272,42.4731],[117.9602,42.4292],[117.9712,42.4292],[118.0042,42.4127],[118.0261,42.3853],[118.0151,42.3468],[118.0261,42.3193],[118.0591,42.3083],[118.0591,42.2864],[117.9712,42.2424],[118.0261,42.2095],[118.0481,42.193],[118.103,42.182],[118.114,42.171],[118.103,42.149],[118.092,42.1106],[118.158,42.0831],[118.158,42.0612],[118.136,42.0667],[118.147,42.0557],[118.114,42.0447],[118.125,42.0392],[118.158,42.0282],[118.2019,42.0337],[118.2239,42.0557],[118.2239,42.0831],[118.2458,42.0941],[118.2678,42.0886],[118.3008,42.0557],[118.2788,42.0282],[118.2678,42.0282],[118.2349,42.0172],[118.2898,42.0062],[118.3008,41.9897],[118.3118,41.9897],[118.3008,41.9403],[118.2678,41.9293],[118.2678,41.9183],[118.3337,41.8744],[118.3337,41.8579],[118.3447,41.8469],[118.3228,41.8359],[118.3118,41.781],[118.2788,41.7645],[118.2678,41.7645],[118.2568,41.77],[118.2458,41.781],[118.2458,41.7975],[118.2239,41.814],[118.2019,41.8085],[118.1909,41.814],[118.1689,41.8085],[118.147,41.7975],[118.158,41.7865],[118.136,41.7645],[118.147,41.759],[118.136,41.7316],[118.158,41.7206],[118.1689,41.6821],[118.2239,41.6382],[118.2129,41.6162],[118.2349,41.5833],[118.2898,41.5723],[118.2898,41.5613],[118.3228,41.5668],[118.3118,41.5393],[118.3228,41.5173],[118.3228,41.5063],[118.3118,41.5009],[118.3118,41.4844],[118.2788,41.4789],[118.2678,41.4679],[118.3447,41.4514],[118.3557,41.424],[118.3557,41.391],[118.3667,41.3855],[118.3557,41.3745],[118.3557,41.3525],[118.3667,41.347],[118.3557,41.3361],[118.3777,41.3141],[118.3997,41.3086],[118.4106,41.3196],[118.4216,41.3361],[118.4875,41.347],[118.5095,41.3416],[118.5315,41.358],[118.5425,41.3525],[118.5864,41.3525],[118.6084,41.347],[118.6523,41.347],[118.6743,41.358],[118.6963,41.3306],[118.7073,41.3361],[118.7183,41.3306],[118.7512,41.3251],[118.7842,41.358],[118.8281,41.369],[118.8501,41.3855],[118.8501,41.369],[118.8391,41.3635],[118.8501,41.3525],[118.8501,41.347],[118.8721,41.3031],[118.927,41.3031],[118.949,41.3141],[118.9709,41.3086],[119.0149,41.3086],[119.0369,41.2976],[119.1467,41.2976],[119.2017,41.2866],[119.2126,41.2921],[119.2126,41.3086],[119.2456,41.3086],[119.2566,41.2811],[119.2456,41.2701],[119.2126,41.2537],[119.2126,41.2262],[119.1797,41.2262],[119.1687,41.2152],[119.1907,41.2042],[119.1907,41.1932],[119.1248,41.1383],[119.0808,41.1328],[119.0808,41.0944],[119.0698,41.0724],[119.0479,41.0779],[119.0369,41.0614],[118.96,41.0779],[118.938,41.0559],[118.938,41.0339],[118.949,41.0175],[119.0259,41.0065],[119.0259,40.99],[119.0039,40.968],[118.9709,40.957],[118.938,40.957],[118.916,40.968],[118.905,40.9625],[118.8831,40.8691],[118.8501,40.8197],[118.8501,40.8032],[118.8831,40.7813],[118.905,40.7813],[118.894,40.7593],[118.949,40.7483],[118.96,40.7208],[118.9819,40.7043],[119.0149,40.6879],[119.0369,40.6879],[119.0588,40.6659],[119.0808,40.6769],[119.1028,40.6659],[119.1577,40.6934],[119.1797,40.6824],[119.1797,40.6659],[119.1467,40.6384],[119.1577,40.6055],[119.1138,40.6055],[119.0808,40.589],[119.0588,40.6055],[118.96,40.556],[118.9709,40.5341],[118.96,40.5341],[118.927,40.5286],[118.894,40.5396],[118.8611,40.5286],[118.8281,40.5341],[118.7952,40.5121],[118.7842,40.4901],[118.7732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