python - 使用 SimpleKML 绘制大圆

Question

我一直在尝试使用点坐标在 Google 地球上绘制一些线条，一切正常，但只有一个小细节。这些线穿过地球并且不跟随表面，所以它们通常是不可见的，因为我在全局各地都有点。有什么想法吗？

line = kml.newlinestring(coords=[firstcoord, secondcoord])

提前致谢:)

Answer 1

您需要启用 tesselate在线几何形状上以遵循地球的曲率。

Very large lines should enable tessellation so that they follow the curvature of the earth (otherwise, they may go underground and be hidden).

要启用曲面分割，<altitudeMode> 的值必须是 clampToGround 或 clampToSeaFloor 否则镶嵌标志将被忽略。

确保生成的 KML 输出如下所示:

  <Placemark>
    <name>line with tessellation</name>
    <LineString>
      <tessellate>1</tessellate>
      <altitudeMode>clampToGround</altitudeMode>
      <coordinates>
        -122.383103,37.617112 -73.782201,40.643612 
      </coordinates>
    </LineString>
  </Placemark>

执行此操作的 Python 代码:

import simplekml

kml = simplekml.Kml()
firstcoord = (-122.383103, 37.617112)
secondcoord = (-73.782201, 40.643612)
line = kml.newlinestring(tessellate=1,
                         altitudemode=simplekml.AltitudeMode.clamptoground,
                         coords=[firstcoord, secondcoord])

print("Output: line.kml")
kml.save("line.kml")