Question

我正在尝试做一些个人项目，我试图在谷歌地图上添加海洋层。所以决定选择免费的osm选项。

我想在海标上添加海洋轮廓和ais图层作为默认图层。到目前为止，谷歌地图上的标记层osm是可以的。

如何将其他图层添加为带有海标图层的默认图层。我无法弄清楚如何在地图上添加其他图层作为默认值。

提前致谢！

和代码段：

＆＃13;

var map;

function initMap() {

  map = new google.maps.Map(document.getElementById('map'), {
    zoom: 9,
    center: {
      lat: 44.5,
      lng: 13.1
    },
    mapTypeControlOptions: {
      mapTypeIds: ['roadmap']
    }
  });


  var osmMapTypeOptions = {
    getTileUrl: function(coord, zoom) {
      console.log("getTileUrl("+coord.x+","+coord.y+","+zoom+")");
      var z = zoom;
      var limit = Math.pow(2, z);
      if (coord.y < 0 || coord.y >= limit) {
        return null;
      } else {
        coord.x = ((coord.x % limit) + limit) % limit;
        url = "http://t1.openseamap.org/seamark/";
        path = zoom + "/" + coord.x + "/" + coord.y + "." + "png";
        console.log("getTileUrl:" + url + path);
        return url + path;
      
      }
    },
    tileSize: new google.maps.Size(256, 256),
    isPng: true,
    maxZoom: 19,
    minZoom: 0,
    name: "OSM"
  };

  function getTileURL(bounds) {
    var res = this.map.getResolution();
    var x = Math.round((bounds.left - this.maxExtent.left) / (res * this.tileSize.w));
    var y = Math.round((this.maxExtent.top - bounds.top) / (res * this.tileSize.h));
    var z = this.map.getZoom();
    var limit = Math.pow(2, z);
    if (y < 0 || y >= limit) {
      return null;
    } else {
      x = ((x % limit) + limit) % limit;
      url = this.url;
      path = z + "/" + x + "/" + y + "." + this.type;
      if (url instanceof Array) {
        url = this.selectUrl(path, url);
      }
      return url + path;
    }
  }

  var osmMapType = new google.maps.ImageMapType(osmMapTypeOptions);

  map.overlayMapTypes.insertAt(0,osmMapType);
  map.overlayMapTypes.insertAt(1,osmMapType);

}
google.maps.event.addDomListener(window, "load", initMap);

＆＃13;

html,
body,
#map {
  height: 100%;
  width: 100%;
  margin: 0px;
  padding: 0px
}

＆＃13;

<script src="https://maps.googleapis.com/maps/api/js?language=en&libraries=drawing,geometry"></script>
<div id="map"></div>

＆＃13;

Answer 1

我找到了在地图上使用多个图层的示例：

https://developers.google.com/fusiontables/docs/samples/multiple_layers_per_map

<!DOCTYPE html>
<!--
  Copyright 2011 Google Inc. All Rights Reserved.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="UTF-8">

    <title>Fusion Tables Layer Example: Multiple Layers per Map</title>

    <link href="/apis/fusiontables/docs/samples/style/default.css"
        rel="stylesheet" type="text/css">
    <script type="text/javascript"
        src="http://maps.google.com/maps/api/js?sensor=false"></script>

    <script type="text/javascript">
      function initialize() {
        var map = new google.maps.Map(document.getElementById('map-canvas'), {
          center: new google.maps.LatLng(37.4, -122.1),
          zoom: 5,
          mapTypeId: google.maps.MapTypeId.ROADMAP
        });

        var infoWindow = new google.maps.InfoWindow();

        // Initialize the first layer
        var firstLayer = new google.maps.FusionTablesLayer({
          query: {
            select: 'geometry',
            from: '196LqydLhOq1Wl9612hNhcGoh4vUmRjTaiFvDhA'
          },
          map: map,
          suppressInfoWindows: true
        });
        google.maps.event.addListener(firstLayer, 'click', function(e) {
          windowControl(e, infoWindow, map);
        });

        // Initialize the second layer
        var secondLayer = new google.maps.FusionTablesLayer({
          query: {
            select: "'Full Address'",
            from: '1tL67aacGcCyMfAg9PUo_-gp4qm74GDtFiCMtFg'
          },
          map: map,
          suppressInfoWindows: true
        });
        google.maps.event.addListener(secondLayer, 'click', function(e) {
          windowControl(e, infoWindow, map);
        });
      }

      // Open the info window at the clicked location
      function windowControl(e, infoWindow, map) {
        infoWindow.setOptions({
          content: e.infoWindowHtml,
          position: e.latLng,
          pixelOffset: e.pixelOffset
        });
        infoWindow.open(map);
      }

      google.maps.event.addDomListener(window, 'load', initialize);
    </script>
  </head>
  <body>
    <div id="map-canvas"></div>
  </body>
</html>

希望有所帮助。

Answer 2

尝试创建：

var osmMapTypeOptions2 = {...}
...
var osmMapType2 = new google.maps.ImageMapType(osmMapTypeOptions2);
...

然后：

 map.overlayMapTypes.insertAt(0,osmMapType);
 map.overlayMapTypes.insertAt(1,osmMapType);
 map.overlayMapTypes.insertAt(2,osmMapType2);
 map.overlayMapTypes.insertAt(3,osmMapType2);

Google地图上的Openseamap - 默认添加海洋剖面图层

2 个答案: