The basic advantages of vertical air photos are:
1. The scale is essentially constant;
2. Measurements of directions are easier than on oblique photograph. Directions can also be measured more accurately;
3. Within limits a vertical aerial photograph can be used as a map (if grids and marginal data are added); and,
4. Vertical aerial photographs are often easier to interpret than oblique and are better for stereo (there is no masking).
The advantages of an oblique aerial photograph include: