The DK now brings Fresnel zone analysis for radio wave propagation purposes.
Class TGIS_Viewshed got a new method, GenerateFresnel, and a new property, Frequency. Generating grid data with Fresnel Zone clearance is as easy as:
viewshed = new TGIS_Viewshed();
viewshed.Frequeny = 100000000 ; // 100 Mhz
layer with digital elevation model;
layer with location of transmitters;
output layer with pixel values varying between 0 and 100 (clearance in percents)
number of Fresnel zone for which calculation will be performed;
value to be added to DEM (like forest height);
attribute field with transmitter elevation height offset;
fixed transmitters height offset.
The computation result looks like:
Mast: 100m, Frequency: 100Mhz
See more in Documentation.