Find combinations of regions visible. Clicking anywhere between the vertical profile and the straight line gives the calculated value of the bridge height or tunnel depth at that spot. You can set whatever colors you like. Line of Sight - A Profile display that is colored to show what parts of the Profile are visible from the Start point. Visible parts of the profile are in light color.
Invisible parts are in dark color.
Grid boxes colored in blue are visible from the Start point. Heights where different parts of the 3D Surface are joined are instantly revelaed. Rotate , Zoom fly around your data on all three axes at once, if desired. You can voyage at the same time you use 3D Controls to change colors or style of surface from solid, say, to wireframe. For example, the visibility zones created for two tower locations shown in the thumbnail at left can be brought back into Manifold GIS map as the polygonal area objects shown in the map thumbnail at right.