kml模糊背景，多边形除外

Question

我有一个带有公司工作区域多边形的kml。

我想使整个外部变得模糊，以清楚地突出显示该区域不在范围内。注意：在屏幕截图中，红色边缘是多边形的样式。我将其删除。关于如何执行此操作的任何想法？

example of blurred outer polygon

kml中的代码（已删除的无关部分）

<?xml version="1.0" encoding="utf-8" ?>
<kml xmlns="http://www.opengis.net/kml/2.2">
    <Document id="root_doc">
        <Folder>
            <name>Angervilliers_AL8</name>
            <Placemark>
                <name>Angervilliers</name>
                <Style>
                    <LineStyle>
                        <color>ff0000ff</color>
                    </LineStyle>
                    <PolyStyle>
                        <fill>0</fill>
                    </PolyStyle>
                </Style>
                <Polygon>
                    <outerBoundaryIs>
                        <LinearRing>
                            <coordinates>1.8823674,48.5142152 1.8837864,48.5138449 ...</coordinates>
                        </LinearRing>
                    </outerBoundaryIs>
                </Polygon>
            </Placemark>
        </Folder>
    </Document>
</kml>

Answer 1

要获得此效果，您需要创建一个较大的多边形轮廓以覆盖“模糊”区域，然后创建多边形中“孔”（要在中间保持清晰的区域）的内线。它们进入<outerBoundaryIs>标签内的<innerBoundaryIs>和<Polygon>标签中。

下面是一个有效的示例...请尝试将其复制/粘贴到Earth Pro中。还要注意<LookAt>部分，该视图强制将视图放大到内部多边形上，因此用户不会注意到多边形的外部边界，除非它们向外缩小。

<?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">
    <Document id="root_doc">
        <name>Inverted Polygon Demo</name>
        <Placemark>
            <name>Angervilliers</name>
            <LookAt>
                <longitude>2.06384</longitude>
                <latitude>48.59146</latitude>
                <heading>0</heading>
                <tilt>0</tilt>
                <range>3000</range>
            </LookAt>               
            <Style>
                <LineStyle>
                    <color>ff0000ff</color>
                </LineStyle>
                <PolyStyle>
                    <fill>1</fill>
                    <color>88ffffff</color>
                </PolyStyle>
            </Style>
            <Polygon>
                <outerBoundaryIs>
                    <LinearRing>
                        <coordinates>
                            0.3184451839056446,47.78618899775447,0 3.661259487435122,47.80641551814697,0 3.695580055346501,49.36244976492695,0 0.2356130804739087,49.36861085533987,0 0.3184451839056446,47.78618899775447,0 
                        </coordinates>
                    </LinearRing>
                </outerBoundaryIs>
                <innerBoundaryIs>
                    <LinearRing>
                        <coordinates>
                            2.058365295534554,48.59459332179971,0 2.055806623017014,48.59347610558855,0 2.051167395626068,48.59309196143701,0 2.053826722439367,48.59152032273916,0 2.059404688365358,48.5906235533257,0 2.058795280866135,48.58977412250532,0 2.053976866512941,48.58818157946221,0 2.055353500059218,48.58521810150005,0 2.060326614008405,48.58453057119874,0 2.06261321438489,48.59037827408845,0 2.065888887077823,48.59124861689973,0 2.071575394540492,48.59109027523166,0 2.075460981003194,48.59050363005721,0 2.077744729364595,48.59052448781961,0 2.078079473747407,48.59149049454836,0 2.072318523336512,48.59352956508539,0 2.072078869584328,48.59455791455283,0 2.068689814773501,48.59359361048438,0 2.068109548294674,48.59488295734163,0 2.064472047819985,48.5969248658065,0 2.060703393863961,48.59688230010441,0 2.058365295534554,48.59459332179971,0 
                        </coordinates>
                    </LinearRing>
                </innerBoundaryIs>                  
            </Polygon>
        </Placemark>
    </Document>
</kml>