How do I change the topographic elevation data used in path profiles shown in HDPath?

To change the topographic elevation data used on the path, click the Topo Data label to open the Topo Data section:

Topo Data label

You can change the type of data used, or the increment (“step”) between the elevation points, the elevation interpolation method used, or the effective earth curvature used.

For example, you can change the effective earth curvature to “2/3 earth” (0.666) instead of “4/3 earth” (1.333):

Change earth curvature

(Note the difference in the curvature base line, and the increased line-of-sight obstruction by comparing this plot to the 1.333 plot above.)

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