适用于Google地球的KML：如何将图标大小设置为特定的物理距离？
我有一组带有时间戳的GPS数据点，我用它来创建一个人沿路径运动的动画。 GPS数据还具有我想使用图标大小在地图上表示的准确度数字（以米为单位）。我希望Icon是一个以人的纬度/长度为中心的圆，半径等于GPS测量的精度。
我搜索了论坛/ Google，无法找到在物理距离上指定图标大小的方法。有没有办法做到这一点？我已经阅读了<scale>属性，它允许您调整图标的大小，但对我来说，如何计算与地图上10米相对应的正确比例数并不明显。有没有人有创建特定物理尺寸图标的经验？
2 个答案:
答案 0 :(得分：1)
图标大小调整是设置像素数。
另一种方法是在kml中使用模型
https://developers.google.com/kml/documentation/kmlreference#model
这比计算圆圈的lon lats计算强度要小
使用Sketchup（直径1米的圆柱体
）创建一个简单的尺寸缩放模式你可以使用
<Scale>
<x>1</x>
<y>1</y>
<z>1</z>
</Scale>
将x和y设置为精度
一个例子
kml：
<?xml version="1.0" encoding="utf-16"?>
<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>TestScaleSize</name>
<name>PathPoints</name>
<Placemark>
<name>Point1</name>
<TimeStamp> <when>2012-06-20T12:00</when></TimeStamp>
<Model>
<altitudeMode>relativeToGround</altitudeMode>
<Location><longitude>-123.145702</longitude><latitude> 49.26400</latitude> <altitude>0</altitude></Location>
<Scale><x>8</x><y>8</y><z>1</z></Scale>
<Link><href>scaleIcon.dae</href></Link>
</Model>
</Placemark>
<Placemark>
<name>Point2</name>
<TimeStamp> <when>2012-06-20T12:01</when></TimeStamp>
<Model>
<altitudeMode>relativeToGround</altitudeMode>
<Location><longitude>-123.145702</longitude><latitude> 49.26405</latitude> <altitude>0</altitude></Location>
<Scale><x>5</x><y>5</y><z>1</z></Scale>
<Link><href>scaleIcon.dae</href></Link>
</Model>
</Placemark>
<Placemark>
<name>Point3</name>
<TimeStamp> <when>2012-06-20T12:02</when></TimeStamp>
<Model>
<altitudeMode>relativeToGround</altitudeMode>
<Location><longitude>-123.145702</longitude><latitude> 49.26410</latitude> <altitude>0</altitude></Location>
<Scale><x>4</x><y>4</y><z>1</z></Scale>
<Link><href>scaleIcon.dae</href></Link>
</Model>
</Placemark>
<Placemark>
<name>Point4</name>
<TimeStamp> <when>2012-06-20T12:03</when></TimeStamp>
<Model>
<altitudeMode>relativeToGround</altitudeMode>
<Location><longitude>-123.145702</longitude><latitude> 49.26415</latitude> <altitude>0</altitude></Location>
<Scale><x>3</x><y>3</y><z>1</z></Scale>
<Link><href>scaleIcon.dae</href></Link>
</Model>
</Placemark>
<Placemark>
<name>Point5</name>
<TimeStamp> <when>2012-06-20T12:04</when></TimeStamp>
<Model>
<altitudeMode>relativeToGround</altitudeMode>
<Location><longitude>-123.145702</longitude><latitude> 49.26420</latitude> <altitude>0</altitude></Location>
<Scale><x>2</x><y>2</y><z>1</z></Scale>
<Link><href>scaleIcon.dae</href></Link>
</Model>
</Placemark>
<Placemark>
<name>Point6</name>
<TimeStamp> <when>2012-06-20T12:05</when></TimeStamp>
<Model>
<altitudeMode>relativeToGround</altitudeMode>
<Location><longitude>-123.145702</longitude><latitude> 49.26425</latitude> <altitude>0</altitude></Location>
<Scale><x>1</x><y>1</y><z>1</z></Scale>
<Link><href>scaleIcon.dae</href></Link>
</Model>
</Placemark>
<Placemark>
<name>Point7</name>
<TimeStamp> <when>2012-06-20T12:06</when></TimeStamp>
<Model>
<altitudeMode>relativeToGround</altitudeMode>
<Location><longitude>-123.145702</longitude><latitude> 49.26430</latitude> <altitude>0</altitude></Location>
<Scale><x>1</x><y>1</y><z>1</z></Scale>
<Link><href>scaleIcon.dae</href></Link>
</Model>
</Placemark>
<Placemark>
<name>Point8</name>
<TimeStamp> <when>2012-06-20T12:07</when></TimeStamp>
<Model>
<altitudeMode>relativeToGround</altitudeMode>
<Location><longitude>-123.145702</longitude><latitude> 49.26435</latitude> <altitude>0</altitude></Location>
<Scale><x>3</x><y>3</y><z>1</z></Scale>
<Link><href>scaleIcon.dae</href></Link>
</Model>
</Placemark>
<Placemark>
<name>Point9</name>
<TimeStamp> <when>2012-06-20T12:08</when></TimeStamp>
<Model>
<altitudeMode>relativeToGround</altitudeMode>
<Location><longitude>-123.145702</longitude><latitude> 49.26440</latitude> <altitude>0</altitude></Location>
<Scale><x>1</x><y>1</y><z>1</z></Scale>
<Link><href>scaleIcon.dae</href></Link>
</Model>
</Placemark>
<Placemark>
<name>Point10</name>
<TimeStamp> <when>2012-06-20T12:09</when></TimeStamp>
<Model>
<altitudeMode>relativeToGround</altitudeMode>
<Location><longitude>-123.145702</longitude><latitude> 49.26445</latitude> <altitude>0</altitude></Location>
<Scale><x>1</x><y>1</y><z>1</z></Scale>
<Link><href>scaleIcon.dae</href></Link>
</Model>
</Placemark>
</Document>
</kml>
模型的xml如下所示，将其另存为“scaleIcon.dae”，并将它们放在同一个文件夹中，
![<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<COLLADA xmlns="http://www.collada.org/2005/11/COLLADASchema" version="1.4.1">
<asset>
<contributor>
<authoring_tool>Google SketchUp 8.0.11752</authoring_tool>
</contributor>
<created>2012-06-21T02:47:22Z</created>
<modified>2012-06-21T02:47:22Z</modified>
<unit meter="0.02539999969303608" name="inch" />
<up_axis>Z_UP</up_axis>
</asset>
<library_visual_scenes>
<visual_scene id="ID1">
<node name="SketchUp">
<instance_geometry url="#ID2">
<bind_material>
<technique_common>
<instance_material symbol="Material2" target="#ID3">
<bind_vertex_input semantic="UVSET0" input_semantic="TEXCOORD" input_set="0" />
</instance_material>
</technique_common>
</bind_material>
</instance_geometry>
</node>
</visual_scene>
</library_visual_scenes>
<library_geometries>
<geometry id="ID2">
<mesh>
<source id="ID5">
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<technique_common>
<accessor count="96" source="#ID8" stride="3">
<param name="X" type="float" />
<param name="Y" type="float" />
<param name="Z" type="float" />
</accessor>
</technique_common>
</source>
<source id="ID6">
<float_array id="ID9" count="288">0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 0 0 -1 -0.7071067811865475 0.7071067811865476 0 -0.4999999999999999 0.8660254037844387 0 -0.7071067811865475 0.7071067811865476 0 -0.4999999999999999 0.8660254037844387 0 -0.2588190451025206 0.9659258262890684 0 -0.2588190451025206 0.9659258262890684 0 2.673332968694072e-016 1 0 2.673332968694072e-016 1 0 0.2588190451025209 0.9659258262890682 0 0.2588190451025209 0.9659258262890682 0 0.5 0.8660254037844386 0 0.5 0.8660254037844386 0 0.7071067811865475 0.7071067811865476 0 0.7071067811865475 0.7071067811865476 0 0.8660254037844387 0.5 0 0.8660254037844387 0.5 0 0.9659258262890684 0.2588190451025206 0 0.9659258262890684 0.2588190451025206 0 1 -4.901110442605798e-016 0 1 -4.901110442605798e-016 0 0.9659258262890682 -0.2588190451025212 0 0.9659258262890682 -0.2588190451025212 0 0.8660254037844384 -0.5000000000000004 0 0.8660254037844384 -0.5000000000000004 0 0.7071067811865471 -0.707106781186548 0 0.7071067811865471 -0.707106781186548 0 0.4999999999999995 -0.8660254037844389 0 0.4999999999999995 -0.8660254037844389 0 0.2588190451025204 -0.9659258262890684 0 0.2588190451025204 -0.9659258262890684 0 -4.72288824469286e-016 -1 0 -4.72288824469286e-016 -1 0 -0.2588190451025212 -0.9659258262890682 0 -0.2588190451025212 -0.9659258262890682 0 -0.5000000000000004 -0.8660254037844384 0 -0.5000000000000004 -0.8660254037844384 0 -0.7071067811865479 -0.7071067811865471 0 -0.7071067811865479 -0.7071067811865471 0 -0.8660254037844388 -0.4999999999999998 0 -0.8660254037844388 -0.4999999999999998 0 -0.9659258262890684 -0.2588190451025205 0 -0.9659258262890684 -0.2588190451025205 0 -1 2.316888572868195e-016 0 -1 2.316888572868195e-016 0 -0.9659258262890682 0.258819045102521 0 -0.9659258262890682 0.258819045102521 0 -0.8660254037844386 0.5000000000000001 0 -0.8660254037844386 0.5000000000000001 0 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1 -0 -0 1</float_array>
<technique_common>
<accessor count="96" source="#ID9" stride="3">
<param name="X" type="float" />
<param name="Y" type="float" />
<param name="Z" type="float" />
</accessor>
</technique_common>
</source>
<vertices id="ID7">
<input semantic="POSITION" source="#ID5" />
<input semantic="NORMAL" source="#ID6" />
</vertices>
<triangles count="92" material="Material2">
<input offset="0" semantic="VERTEX" source="#ID7" />
<p>0 1 2 1 0 3 3 0 4 3 4 5 5 4 6 5 6 7 7 6 8 7 8 9 9 8 10 9 10 11 11 10 12 11 12 13 13 12 14 13 14 15 15 14 16 15 16 17 17 16 18 17 18 19 19 18 20 19 20 21 21 20 22 21 22 23 24 25 26 25 24 27 27 28 25 28 27 29 29 30 28 30 29 31 31 32 30 32 31 33 33 34 32 34 33 35 35 36 34 36 35 37 36 38 39 38 36 37 39 40 41 40 39 38 41 42 43 42 41 40 43 44 45 44 43 42 45 46 47 46 45 44 47 48 49 48 47 46 48 50 49 50 48 51 51 52 50 52 51 53 53 54 52 54 53 55 55 56 54 56 55 57 57 58 56 58 57 59 59 60 58 60 59 61 62 60 61 60 62 63 64 63 62 63 64 65 66 65 64 65 66 67 68 67 66 67 68 69 70 69 68 69 70 71 24 71 70 71 24 26 72 73 74 73 72 75 73 75 76 76 75 77 76 77 78 78 77 79 78 79 80 80 79 81 80 81 82 82 81 83 82 83 84 84 83 85 84 85 86 86 85 87 86 87 88 88 87 89 88 89 90 90 89 91 90 91 92 92 91 93 92 93 94 94 93 95</p>
</triangles>
</mesh>
</geometry>
</library_geometries>
<library_materials>
<material id="ID3" name="Color_A01_">
<instance_effect url="#ID4" />
</material>
</library_materials>
<library_effects>
<effect id="ID4">
<profile_COMMON>
<technique sid="COMMON">
<lambert>
<diffuse>
<color>1 0 0 1</color>
</diffuse>
</lambert>
</technique>
</profile_COMMON>
</effect>
</library_effects>
<scene>
<instance_visual_scene url="#ID1" />
</scene>
</COLLADA>][1]
答案 1 :(得分：0)
经过一番搜索，我发现了一种方法，虽然不是用图标。我想我会分享以防其他人需要做类似的事情。据我所知，没有办法将图标设置为特定大小（物理距离，而不是像素），但您可以使用<Polygon>标记绘制自己的圆圈期望的物理半径。
计算长期和短期并非完全直截了当。圆的半径上每个点的lat，但是我找到了这个伟大的python工具，它将为你生成<Polygon>代码，给出中心的纬度/长度和半径（米）：
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