如何反转KML，以便突出显示多边形外部的区域 [英] How to invert KML so that area outside of polygon is highlighted

问题描述

我有一个KML文件，它是一个覆盖城市边界的多边形.目前，我的多边形为灰色阴影.我想将其反转，所以世界其他地方都变灰了，

I have a KML File which is a polygon that overlays the boundaries of a city. Currently my polygon is shaded gray. I would like to invert it, so the rest of the world is greyed out,

这是kml的链接，它应该带您到Google地图. 埃德蒙顿市

Here is a link to the kml, it should take you to Google maps. City of Edmonton

我不确定我是否需要在KML中对此进行更改，或者可以使用Google Maps API来完成.

I'm not really sure if this is something I need to change in my KML, or can be accomplished with the Google Maps API.

推荐答案

您需要更改KML.在覆盖整个世界的多边形上添加外边界.确保外部多边形的缠绕方向与内部多边形的缠绕方向相反.

You need to change your KML. Add an outer boundary to the polygon that covers the whole world. Make sure the winding direction of the outer polygon is opposite the winding direction of the inner polygon.

请注意

Note that KML doesn't seem to work with the Google Maps Javascript API v3 KmlLayer renderer, might need to reverse the winding directions.

代码段:

function initialize() {
  myLatLng = new google.maps.LatLng(37.422104808, -122.0838851);
  var myOptions = {
    center: {
      lat: 37.155939,
      lng: -79.497071
    },
    zoom: 6
  };
  map = new google.maps.Map(document.getElementById("map_canvas"),
    myOptions);
  infowindow = new google.maps.InfoWindow({});

  geoXml = new geoXML3.parser({
    map: map,
    suppressInfoWindows: true,
    zoom: false
  });
  geoXml.parseKmlString(virginia_inverted_kml);
}
google.maps.event.addDomListener(window, 'load', initialize);
var virginia_inverted_kml =
  '<kml xmlns="http://www.opengis.net/kml/2.2"><Document><Folder id="Fusiontables"><name>Fusiontables folder</name><Style id="BasicStyle"><BalloonStyle><text>$[description]</text></BalloonStyle><IconStyle><color>FFFFFFFF</color><scale>1.1</scale><hotSpot x="0.5" y="0" xunits="fraction" yunits="fraction"/><Icon><href>http://maps.google.com/mapfiles/kml/paddle/red-blank_maps.png</href></Icon></IconStyle></Style><Placemark><name><![CDATA[ 76 ]]></name><styleUrl>#BasicStyle</styleUrl><description><![CDATA[ <div class="googft-info-window" style="font-family:sans-serif"> <b>objectid:</b> 76<br> <b>vertexcou:</b> 1326.00000000000<br> <b>iso:</b> USA<br> <b>name_0:</b> United States of America<br> <b>name_1:</b> Virginia<br> <b>varname_1:</b> VA<br> <b>hasc_1:</b> US.VA<br> <b>type_1:</b> State<br> <b>engtype_1:</b> State<br> <b>validfr_1:</b> 18630619 </div> ]]></description><MultiGeometry><Polygon><outerBoundaryIs><LinearRing><coordinates>180,85 90,85 0,85 -90,85 -180,85 -180,0 -180,-85 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