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This link may be helpful if you know the focal length and sensor height of the camera. For far distance object you can use the equation by THE RULE OF 57

Distance of object= (Size of object * 360)/(2 * 3.14 * Angular size in degree). For more information refer this link.

Hope these helpful....

This link may be helpful if you know the focal length and sensor height of the camera. camera. For far distance object you can use the equation by THE RULE OF 57

Distance of object= (Size of object * 360)/(2 * 3.14 * Angular size in degree). degree).

For more information refer this link.

Hope these helpful....