What provides easier measurements than oblique photographs in aerial photography?

Vertical photographs provide easier measurements than oblique photographs in aerial photography because they are captured with the camera pointed directly downward toward the ground. This orientation eliminates the distortions and perspective effects that are inherent in oblique photographs, where the camera is angled.

In vertical photographs, the scale is more consistent throughout the image, making it simpler to measure distances and areas accurately. This uniform scale is crucial for applications in surveying and mapping, where precision is essential. Additionally, vertical photographs facilitate straightforward overlay with maps and other geographic information systems because they align well with the grid used in cartography, further enhancing their utility for measurement purposes.

The other options each have specific uses or characteristics but do not provide the same level of straightforward measurement that vertical photographs do. Orthophotos, for example, are corrected for distortion and can be used for measurements, but vertical photographs inherently simplify the process from the outset.