Global Mapper can model the bottom part of the ellipse representing a Fresnel Zone in the Line of Sight and Viewshed tools. This is an elliptical shape between the transmitter and the receiver.
When Fresnel Zone Fresnel Zones model the signal loss based on reflection and diffraction. The To SightĮlevation section provides the same functionality for the end position In either feet or meters, above the ground,above sea level, or above a selected layer. To use in the line of sight calculations. The From Sight Elevation specifies the height at the start position (left side of graph) Then the minimum clearance number is negative, the line of sight is (most) obstructed at the location of minimum clearance, as in the example image below.įor additional statistics on the line and the clearance, go to Path Setup > Show Path Details. Minimum clearance indicates the point of smallest distance between the line and the terrain surface. The coordinates and height of clearance will also be indicated on the top of the profile window.
Along with the yellow line depicting the actual line of sight, the point of minimum clearanceĪlong the line will be displayed with a dashed red line in the path profile window.
The line of sight will be displayed in the path profile window (picturedīelow). Up the line of sight calculation in the dialog and pressing the OK button, Line of sight analysis cannot be performed on multi-segment paths). Of sight analysis can only be performed on a line made up of two points in the path profile (e.g.
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