加载本地 GeoJSON 文件并将其与 Google Maps Javascript API v3 数据层一起使用

2024-04-12

我创建了一个可在 DataLayer：拖放教程中使用的 JSON FeatureCollection。到目前为止，它只是 2 条道路的集合，但我不知道如何加载 JSON 文件。目前它是一个本地文件，所以我认为调用它并按照教程设计它将使我走上正确的道路。但它不起作用。以下是 HTML 和 JSON 文件。

    <!DOCTYPE html>
    <html>
    <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <title>FMRE Main Map</title>
    <!-- Style Section for the Window -->
    <style>
    html { height: 610px; width: 575px; }
    body { height: 610px; width:575px; margin: 0; padding: 0 }
    #map-canvas { height: 604px; width: 566px;}
    }
    </style>
    <!-- Calling the Google Map API version 3 -->
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
    <!-- Styling the Custom Main Map -->
    <script>
    var fmreMain = new google.maps.LatLng(29.681418,-95.714802);
    var MY_MAPTYPE_ID = 'custom_style';
    <!-- Styling for the Different Features on the Map from Google -->
    function initialize() {

    var featureOpts = [
      {
        "featureType": "poi.sports_complex",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.attraction",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.business",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "landscape.man_made",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.medical",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.government",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.place_of_worship",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.attraction",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.park",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.park",
        "elementType": "labels.text",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "administrative.land_parcel",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "road.local",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "road.arterial",
        "elementType": "labels.text",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "road.highway",
        "elementType": "labels.icon",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "road.highway",
        "elementType": "labels.text",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "road.highway",
        "elementType": "geometry",
        "stylers": [
          {  "visibility": "off" }
        ]
      },
      {
        "featureType": "road.arterial",
        "elementType": "geometry",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "road.arterial",
        "elementType": "labels.text",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "road.arterial",
        "elementType": "labels.icon",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "water",
        "elementType": "labels.text",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "water",
        "stylers": [
          { "color": "#0000ff" }
        ]
      },
      {
        "featureType": "landscape.natural.landcover",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "landscape.natural.terrain",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "administrative.locality",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "administrative.neighborhood",
        "stylers": [
          { "visibility": "off" }
        ]
      }

    ];

    <!-- Setting for the Main Map -->

    var mapOptions = {
        center: fmreMain,
        backgroundColor: "#330033",
        zoom: 11,
        maxZoom: 12,
        minZoom: 10,
        zoomControl: false,
        mapTypeControl: false,
        streetViewControl: false,
        panControl: false,
        mapTypeId: MY_MAPTYPE_ID
    };

    map = new google.maps.Map(document.getElementById('map-canvas'),
          mapOptions);

    <!-- Settings for the Custom View Box -->

    var styledMapOptions = {
        name: 'FMRE',
        alt: 'Katy Areas'
                };

      var customMapType = new google.maps.StyledMapType(featureOpts,                 styledMapOptions);

    map.data.loadGeoJson('\JSON_MAP_COMPONENTS\Area_Main_Roads.json');

      var featureStyle = {
        strokeColor: '#ff3333',
        strokeWeight: 4
      }

    map.data.setStyle(featureStyle);

    map.mapTypes.set(MY_MAPTYPE_ID, customMapType, featureStyle);

    }

    google.maps.event.addDomListener(window, 'load', initialize);

    </script>

    </head>

    <body>
    <div id="map-canvas"></div>
    </body>
    </html>

GeoJSON 文件

        { "type": "FeatureCollection",
        "features": [

    { "type": "Feature",
     "geometry": 
    { "type": "LineString",   "coordinates": [
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    "properties": {
     "name": "US90A"
     }
     },

    { "type": "Feature",
     "geometry": 
    { "type": "LineString",   "coordinates": [
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    ]
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我不希望 loadGeoJSON 能够使用本地文件（出于安全原因，大多数浏览器默认禁止访问本地文件系统）。如果要使用本地数据，请使用 addGeoJSON 方法：

var data = {... your GeoJSON ...};

map.data.addGeoJson(data);
var featureStyle = {
    strokeColor: '#ff3333',
    strokeWeight: 4
}

map.data.setStyle(featureStyle);

工作小提琴 http://jsfiddle.net/U58qt/3/

这在我的本地计算机上的 Chrome 中适用：

在头部（SO_20140815_data.js 如下）：

<!-- Calling the Google Map API version 3 -->
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
<script src="SO_20140815_data.js"></script>

在初始化结束时

map = new google.maps.Map(document.getElementById('map-canvas'),
      mapOptions);

<!-- Settings for the Custom View Box -->

var styledMapOptions = {
    name: 'FMRE',
    alt: 'Katy Areas'
            };

  var customMapType = new google.maps.StyledMapType(featureOpts, styledMapOptions);

map.data.addGeoJson(data);

  var featureStyle = {
    strokeColor: '#ff3333',
    strokeWeight: 4
  }

map.data.setStyle(featureStyle);

map.mapTypes.set(MY_MAPTYPE_ID, customMapType, featureStyle);

SO_20140815_data.js

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