Earlier this year we showed you the WiNPT, a visualization that used Google Earth terrain data to help plan wireless networks.
WiNPT has rebraned to become EngineMaps and has released a new visualization for point-to-point radio planning: the Fresnel Zones for Radio Links.
As explained by the folks at EngineMaps:
The Fresnel Zones are 3D polygons which should not be obstructed by anything. With this solution, the wireless communications operators can easily check the existence of obstacles, like buildings and terrain elevation inside the zones and analyze which frequency achieves a better signal strength without obstacles losses. The Fresnel Zones are created by EngineMaps considering the positions and distance between antennas, the mast heights, and the signal frequency.
Looking at the above image, the red line represents the direct signal link between antennas, and the 3D yellow model represents the Fresnel Zone. As an example, the image shows obstacles due the existence of buildings.
You can view an example of the 3D model in Google Earth by using this KMZ file.