Aerial Photogrammetry

The parallax of a point on overlapping photographs can be determined using the following relation: where: - and are the parallaxes of points ‘a’ and ‘b’, respectively. - and are the micrometer readings of points ‘a’ and ‘b’, respectively. Given that: we can substitute these values into the equation to solve for : Thus, the parallax of point ‘b’ is approximately 58.53 mm when rounded to 2 decimal places.

The scale of the photograph is given as , or .
The size of the photograph is , which is equivalent to .
Thus, the ground coverage of one photograph is: Now, account for the longitudinal overlap of 65% and sidelap of 20%. The effective ground coverage is: - Longitudinal coverage: - Lateral coverage: To cover an area of , calculate the number of photographs required: Thus, the number of photographs required is 36.

The camera axis of an aerial camera is a critical concept in photogrammetry. It is the line that represents the direction of the camera during the image capture process. The camera axis is defined as the perpendicular line between the photographic center and the optical center of the objective lens. This line is important for proper alignment in aerial photography and image processing. Step 1: Analyzing the options. - Option (A) is incorrect because the optical centers of the objective and eyepiece lens are not involved in defining the camera axis. The eyepiece lens is not directly related to the camera axis. - Option (B) is correct because it accurately defines the camera axis, which is the perpendicular line between the photographic center and the optical center of the objective lens. - Option (C) is incorrect because the camera axis does not necessarily pass through the center of the lens and is not directly related to the plane of the photo. - Option (D) is incorrect because the plumb line is a different concept, not related to the camera axis. Thus, the correct answer is (B).