# How to calculate height of camera and ground coverage via geometry?

I have a GoPro7 that I will mount on a pickup vehicle to capture ground images with video capture.

The camera isn't top down but has about 20 (or 30) degrees inclination from the vertical axis. I want to capture the road that is 4m in width.

Other givens would be:

• Vertical Field of View: 71.0deg
• Horizontal FoV: 86.7deg
• Diagonal FoV: 100deg
• Sensor size: 1/2.3” (6.17×4.55mm)
• Aperture: f/2.8
• Zoom: 0%
• Frame width: 4:3

I would like to know if it is possible (and how) to calculate the needed height of the GoPro for this.

• The bottom of the frame will be narrower than the top of the frame because it is closer to you. Do you want to capture the 4m road at the bottom of the frame, the middle, or the top? Can the camera be turned toward the center of the road or must it face straight ahead? If straight ahead, how much of the 4m is left of centerline? The easiest way is to mark some spots on the road with chalk and move the camera until you can see what you want. Yes, it is quite possible if you describe exactly what you want. Feb 5, 2021 at 16:15
• Don't you remember SOHCAHTOA from high school trigonometry? Feb 5, 2021 at 17:26
• – scottbb
Feb 5, 2021 at 21:02
• What does this have to do with photography? Feb 5, 2021 at 23:13
• @Jonas, I don't want to sound like a grump, but I don't think it's an interesting question. It's a basic trigonometry question that I would have expected to solve easily in high school. There is simply 2 triangles involved, a few measurements given, and the unknowns easily calculable using the formulae that I linked to earlier. Feb 6, 2021 at 22:02