What method is used to plot aerial photos where the angle of tilt is insignificant?

The method that is recognized for plotting aerial photos where the angle of tilt is insignificant is the radial line method. This approach utilizes lines radiating from a central point to delineate the geometry inherent in the aerial photographic imagery. When the photographs are taken with minimal tilt, it allows for more straightforward geometric representation, making the radial line method effective for translating the curved features of the terrain accurately onto a flat plane.

In contrast, orthophotos involve rectifying aerial images to remove distortions introduced by the tilt and terrain relief, which is not necessary here. Vertical photographs are typically taken straight down, but the radial line method is specifically for when images are being plotted rather than processed for orthographic projections. The principal point relates to the center of an image or photogram, and while it’s important in photogrammetry, it does not directly describe a method for plotting aerial photographs. The effectiveness of the radial line method in this context relates to its straightforward usage in translating the visual information without the complexities involved in other methods.