By Ernvik, Aron

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The horizontal wind velocity is the sine curve’s amplitude with respect to the offset. In Figure 11, the maximum value of a sine curve fitted to the points is in the clear air interval, somewhere around 80 degrees azimuth. As can be expected, the minimum value is about 180 degrees from there, 25 of 76 at some 260 degrees. This means that the winds are blowing from around east direction (ene). 5 m/s, so the horizontal wind speed is around 7 m/s. Figure 11. Velocity/azimuth display of the Doppler velocity along a VAD circle.

And beyond the near and far boundaries, not seen in the 2D figure! Remember, in Figure 7, the generated image is orthogonal to the paper. 23 of 76 Figure 8. A CAPPI (left) and a PCAPPI (right) image, showing data from the same location, time, and altitude (2 500 metres). 4 The RHI product rhi is an abbreviation for range/height indicator. The rhi product is generated using data from a single azimuth angle and all elevation angles. The resulting image lies in a plane that is orthogonal to the surface of the earth.

Starting with the two bottom boxes, images are to be displayed on a display unit connected to the graphics card on a computer. The graphics card contains hardware to render 2D and 3D graphics. The 3D graphics may contain light sources and shaded lines and polygons with different opacities and reflection properties. Rendering commands to the hardware are dispatched from the graphics card driver, which is part of the operating system. This, in turn, receives its commands through a graphics api, such as OpenGL, DirectX or QuickDraw.

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3D visualization of weather radar data by Ernvik, Aron

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