如何使用TopoJSON读取geojson文件

Question

我正在努力调整我在阅读json文件后自动调整的json文件。但我收到了错误。

$.getJSON("data/cities.json", function (data) {
        getData = topojson.feature(data, data.features);
        console.log( getData)
    });

Cities.json看起来像

{
 "type": "FeatureCollection",
 "features": [{
     "geometry": {
         "type": "MultiPolygon",
         "coordinates": [
             [
                 [
                     [-73.8283219965448, 40.8446061654002],
                     [-73.828397789942, 40.844583182304],
                     [-73.8285477331865, 40.8448132168025],
                     [-73.8284744943625, 40.8448401137412],
                     [-73.8283219965448, 40.8446061654002]
                 ]
             ]
         ]
     },
     "type": "Feature",
 , {
     "geometry": {
         "type": "MultiPolygon",
         "coordinates": [
             [
                 [
                     [-73.832361912256, 40.8488019205992],
                     [-73.832369554769, 40.8487286684528],
                     [-73.8327312374341, 40.8487518102579],
                     [-73.8327304815978, 40.8487590590352],
                     [-73.8327235953166, 40.8488250624279],
                     [-73.832361912256, 40.8488019205992]
                 ]
             ]
         ]
     },
     "type": "Feature"
 } 


}

如何使用getJSON加载json数据，然后将其传递给topojson

Answer 1

GeoJSON和TopoJSON是两种不同的格式。您无法使用TopoJSON函数来处理GeoJSON。您需要将您拥有的GeoJSON转换为TopoJSON（请参阅the commandline reference），然后加载它。