Camera tilt angle is a calculated parameter and can not be edited directly. The camera tilt angle is an angle between the main optical axis of camera lens and a horizontal.
Though in most of the cases the camera tilt angle is not interesting to designer, VideoCAD is displaying it for information.
Camera inclination in CCTV Design Lens Calculator is determined not by the tilt angle but by three parameters:
The height of view area upper bound can be chosen from the list or typed. For the standard camera position it equals to the maximal height of surveillance.
In the horizontal projection of the calculated view area the space above the upper bound height is not taken into consideration. Together with view area upper bound distance it completely determines a camera tilt angle and all calculated parameters through it.
The height of view area lower bound can be chosen from the list or typed.
For the standard camera position it equals to the minimal height of surveillance. In the horizontal projection of the calculated view area the space below the lower bound height is not taken into consideration.
The height of view area lower bound influences the following calculated parameters:
For the standard camera position (when the camera is located above the view area upper bound),, a view area upper bound distance is the maximal distance of surveillance. The view area upper bound distance is chosen from the list or typed. The view area is calculated up to this distance.
When the camera is located below the view area upper bound, the view area upper bound distance can become the minimal distance of surveillance.
The scheme of the view area on the View area tab always shows camera position correctly.
The view area lower bound distance is a calculated parameter and can not be edited.
For the standard camera position (when the camera is located above the view area upper bound),, the view area lower bound distance is the minimal distance of surveillance (dead zone of surveillance).
When the camera is located below the view area upper bound, in some positions the view area lower bound distance is the minimal distance of surveillance too.
In some positions the view area lower bound distance can be the maximal distance of surveillance.
See the camera position on the scheme of the view area on the View area tab.
The view area lower bound distance can be negative.
The view area projection length is a calculated parameter and can not be edited. When there is an actual view area projection, the view area projection length displays the absolute value of difference between the upper and the lower bound distances of view area projection.
When there is no actual view area projection, the parameter doesn't have any sense and is not displayed.