When it comes to aerial imagery, government GIS departments tend to take a top-down approach. In other words, orthogonal imagery fits the bill when they view their town, city, or county.
While orthogonal imagery is a vital resource for all types of departments, oblique imagery is also beneficial. Oblique aerial images, which are captured from a 40- to 45-degree angle, make object recognition easier, especially when that object can also be viewed from all four cardinal directions.
Take this overhead shot of a building. It may look like an ordinary building. However, it’s difficult to tell what those arches are over the top.