Limited vertical range for RLOS inputs

[mfunk]

Testing RLOS Field of View - Vertical angles, I want to define a field of view between 20 and 90 degrees (e.g. air defense radar). However the range in the entry boxes are limited to a specific range. The left box is limited between -90 and 0. The right box is limited 0 to 90. Viewshed doc (http://pro.arcgis.com/en/pro-app/tool-reference/3d-analyst/using-viewshed-and-observer-points-for-visibility.htm) only states that the range for the VERT1 and VERT2 variables (upper and lower vertical limit) is between -90 and 90. If used as input to the RLOS tool, this is not a limitation and 20 to 90 is a valid range. Not a problem in Viewshed or Viewshed2 in Spatial Analyst either.

The values for both min and max vertical Field of View must fall between -90 and 90, and the min should always be smaller than the max (e.g. VERT2 > VERT1) but other than that there should not be any other value restrictions.