我正在使用KML加載圖像疊加層,然後我試圖使用NetworkLinkControl更改相機視圖值(如高度)。我的NetworkLinkControl更新沒有反映在GE插件中。我在這個問題上做了很多研究,但沒有成功。任何幫助,將不勝感激。使用NetworkLinkControl進行GE插件更新的問題
下面是詳細信息:
google.earth.fetchKml(ge, href, function(kmlObject) { ...
其內部.appendChild()
像這樣做:
walkKmlDom(kmlObject, function() {
if(this.getType().match('KmlNetworkLink')) {
ge.getFeatures().appendChild(this);
//There are 2 NetworkLinks
if(this.getLink().getHref().match('nodesc')) {
networkLinkPhoto = this;
}
else if(this.getLink().getHref().match('control')){
networkLinkControl = this; //will use this for updates later
}
}
});
的.fetchKml()
上述載荷
的過程與加載網絡鏈接KML文件開始以下KML 1:
<kml xmlns="http://www.opengis.net/kml/2.2">
<Document>
<name>Photos</name>
<open>1</open>
<Style id="photoStyle">
<IconStyle>
<Icon>
<href>http://hostname/images/ge_icon.png</href>
</Icon>
</IconStyle>
<BalloonStyle>
<text>$[description]</text>
</BalloonStyle>
</Style>
<Folder>
<name>My Photo</name>
<open>1</open>
<visibility>1</visibility>
<NetworkLink>
<name>My Photo</name>
<open>1</open>
<Link>
<href>http://hostname/images/10000244.kml?auth_key=e34962fce2df4829b0e86870c9e834da&nodesc=1</href>
</Link>
</NetworkLink>
<NetworkLink>
<name>Updater</name>
<Link>
<href>http://hostname/placements/10000244/control?auth_key=e34962fce2df4829b0e86870c9e834da</href>
<refreshMode>onChange</refreshMode>
</Link>
</NetworkLink>
</Folder>
</Document>
</kml>
兩個NetworkLink都通過<Link>
中定義的URL加載它自己的KML文件。
第一個是我的照片(覆蓋)KML 2:
<kml xmlns="http://www.opengis.net/kml/2.2">
<Document>
<name>Photos</name>
<open>1</open>
<Style id="photoStyle">
<IconStyle>
<Icon>
<href>http://hostname/images/ge_icon.png</href>
</Icon>
</IconStyle>
<BalloonStyle>
<text>$[description]</text>
</BalloonStyle>
</Style>
<PhotoOverlay id="image_10000244">
<name>My Photo</name>
<Snippet maxLines="1">
<![CDATA[<a href="#image_10000244">Enter Photo</a>]]>
</Snippet>
<Camera>
<longitude>-122.668</longitude>
<latitude>45.5069</latitude>
<altitude>1.0</altitude>
<heading>66.0</heading>
<tilt>90.0</tilt>
<roll>0.0</roll>
</Camera>
<styleUrl>#photoStyle</styleUrl>
<color>feffffff</color>
<Icon>
<href>http://hostname/get_ge_tile/10000244/$[level]/$[y]/$[x]?auth_key=e34962fce2df4829b0e86870c9e834da</href>
</Icon>
<rotation>0.0</rotation>
<ViewVolume>
<leftFov>-17.5</leftFov>
<rightFov>17.5</rightFov>
<bottomFov>0.0</bottomFov>
<topFov>17.5</topFov>
<near>550.0</near>
</ViewVolume>
<ImagePyramid>
<tileSize>256</tileSize>
<maxWidth>16000</maxWidth>
<maxHeight>8000</maxHeight>
<gridOrigin>upperLeft</gridOrigin>
</ImagePyramid>
<Point>
<coordinates>-122.668,45.5069</coordinates>
</Point>
<shape>sphere</shape>
</PhotoOverlay>
</Document>
</kml>
第二個是更新KML 3:
<kml xmlns="http://www.opengis.net/kml/2.2">
<Document>
<name>Photos</name>
<open>1</open>
<Style id="photoStyle">
<IconStyle>
<Icon>
<href>http://hostname/images/ge_icon.png</href>
</Icon>
</IconStyle>
<BalloonStyle>
<text>$[description]</text>
</BalloonStyle>
</Style>
<NetworkLinkControl>
<Update>
<targetHref>http://hostname/images/10000244.kml?auth_key=e34962fce2df4829b0e86870c9e834da&nodesc=1</targetHref>
<Change>
<PhotoOverlay targetId="image_10000244">
<Camera></Camera>
<ViewVolume></ViewVolume>
<Point></Point>
</PhotoOverlay>
</Change>
</Update>
</NetworkLinkControl>
</Document>
</kml>
GE的插件現在已加載的KML,地標放置在指定座標的 處,然後雙擊地標進入照片 查看模式。
要改變照片的高度,JavaScript的API請求更新:
var updateHref='http://http://hostname/netlinkcontrol/10000244?&altitude=55&auth_key=e34962fce2df4829b0e86870c9e834da'
networkLinkControl.getLink().setHref(updateHref);
服務器響應以KML 4(在服務器日誌所示):
<kml xmlns="http://www.opengis.net/kml/2.2">
<Document>
<name>Photos</name>
<open>1</open>
<Style id="photoStyle">
<IconStyle>
<Icon>
<href>http://hostname/images/ge_icon.png</href>
</Icon>
</IconStyle>
<BalloonStyle>
<text>$[description]</text>
</BalloonStyle>
</Style>
<NetworkLinkControl>
<Update>
<targetHref>http://hostname/images/10000244.kml?auth_key=e34962fce2df4829b0e86870c9e834da&nodesc=1</targetHref>
<Change>
<PhotoOverlay targetId="image_10000244">
<Camera>
<altitude>55</altitude>
</Camera>
<ViewVolume></ViewVolume>
<Point></Point>
</PhotoOverlay>
</Change>
</Update>
</NetworkLinkControl>
</Document>
</kml>
這應該工作,因爲:
<refreshMode>onChange</refreshMode>
設置爲更新器<NetworkLink>
在KML 1中,networkLinkControl.getLink().setHref()
正在進行更改。 在KML 4
<PhotoOverlay targetId="image_10000244">
正確在KML 2<targetHref>
在KML 4靶向<PhotoOverlay id="image_10000244">
在KML 1
GE插件定位到正確<href>
但是不顯示海拔高度變化。我試着通過JavaScript API改變 這個值,它可以工作。但爲什麼KML 方法不起作用?任何想法,將不勝感激。