References Basic features Visual interpretation of aerial photographs is based on recognition of objects, as seen from above, in pictorial format. This visual recognition often takes place without any conscious effort by the interpreter. Nonetheless, there are several basic features that can aid in visual examination and interpretation of airphotos.
Absolute size is an important clue that depends on scale of the photograph.
Some object sizes are common experience, for example a car, tree, etc. But many objects seen on airphotos are not so obvious. Always check photo scale for a guide to object size. The spatial arrangement of individual objects may create a distinctive pattern. This is most apparent for cultural features, for example city street grids, airport runways, agricultural fields, etc.