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The Visibility tool in ArcGIS Pro includes an earth curvature corrections parameter to check for the earth's curvature and refraction. However, by default, the parameter is not displayed in the Visibility tool when the Input raster parameter for the tool is not set or the data type for Input raster is incorrect.
The input raster must be specified before certain parameters of the Visibility tool are displayed. This behavior is different from ArcMap because the Visibility tool in ArcMap displays the Use earth curvature corrections option, but the option is disabled (grayed out) instead.
To display the Use earth curvature corrections option: