如何在位于空中的KML中创建多边形形状？

Question

我需要能够将具有给定高度的多边形对象放置到位于地面之上的KML中。我正在将空域信息显示为KML，并且每个空域都有一个低海拔和高海拔值。

到目前为止，我所能做到的最接近的事情是创建两个具有不同高度的多边形来显示空域，但我无法连接多边形以显示中间区域。

感谢您的帮助

Answer 1

你有两个选择，你可以创建空气空间的collada模型，或者定义每个面的一系列多边形对象，可以定义垂直定向的多边形，注意到您（顺时针或逆时针）的，因为这会影响风格，从底部观察多边形的方向使得它稍深

一个简单rectancular的形状，你将需要6个面

以下KML是其中一个Verticle面填充的五边形示例的修改版本，其他4个Verticle面需要完整，但您会明白。

<?xml version="1.0" encoding="UTF-8"?> 
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom"> 
<Document> 
    <name>pm1.kml</name> 
    <Style id="poly"> 
     <LineStyle> 
      <color>f0ffed42</color> 
     </LineStyle> 
     <PolyStyle> 
      <color>e8ff9257</color> 
     </PolyStyle> 
    </Style> 



<Placemark> 
    <styleUrl>#poly</styleUrl> 
     <Polygon> 
      <altitudeMode>relativeToGround</altitudeMode> 
      <outerBoundaryIs> 
       <LinearRing> 
        <coordinates> 
-77.05844056290393,38.86996206506943,500 -77.05552622493516,38.868757801256,500 
-77.05315536854791,38.87053267794386,500 -77.05465973756702,38.87291016281703,500 -77.05788457660967,38.87253259892824,500 -77.05844056290393,38.86996206506943,500 </coordinates> 
       </LinearRing> 
      </outerBoundaryIs> 
     </Polygon> 
</Placemark> 
<Placemark> 
    <styleUrl>#poly</styleUrl> 
     <Polygon> 
      <altitudeMode>relativeToGround</altitudeMode> 
      <outerBoundaryIs> 
       <LinearRing> 
        <coordinates> 
-77.05844056290393,38.86996206506943,400 -77.05552622493516,38.868757801256,400 
-77.05315536854791,38.87053267794386,400 -77.05465973756702,38.87291016281703,400 -77.05788457660967,38.87253259892824,400 -77.05844056290393,38.86996206506943,400 </coordinates> 
       </LinearRing> 
      </outerBoundaryIs> 
     </Polygon> 
</Placemark> 

<Placemark> 
    <styleUrl>#poly</styleUrl> 
     <Polygon> 
      <altitudeMode>relativeToGround</altitudeMode> 
      <outerBoundaryIs> 
       <LinearRing> 
        <coordinates> 
-77.05844056290393,38.86996206506943,500 -77.05844056290393,38.86996206506943,400 -77.05552622493516,38.868757801256,400 -77.05552622493516,38.868757801256,500 -77.05844056290393,38.86996206506943,500 
</coordinates> 
       </LinearRing> 
      </outerBoundaryIs> 
     </Polygon> 
</Placemark> 

</Document> 
</kml> 

Answer 2

这听起来像你正在创建2个2D多边形，而不是3D的？ 您可以创建一个普通的3D多边形：

http://code.google.com/apis/kml/documentation/kml_tut.html#polygons

然后检查在KML的altitudemode标签为 “浮起来” 表面之上：

http://code.google.com/apis/kml/documentation/altitudemode.html