ABSTRACT
Visual perception differs according to the colour of an image. The eye perceives up to 16 grey levels in black and white and about 10,000 colours. Interpretation of aerial photographs has been done for several decades for many thematic subjects concerned with the investigation of natural sciences, such as geology, geography, agronomy, soil science, botany and urban studies. The basic approach to interpretation of an aerial photograph is to proceed from the simplest to the most complicated. Thus, the brain interprets the various features appearing on the image in the order of legibility and stores them in memory. Features most readily discernible in a photograph or an image are lines and straightline aspects such as roads, boundaries of agricultural or forest zones, etc., which in most cases are produced by the effect of human activity on the environment. Parcels are analysed on the basis of criteria of size, shape, abundance and mode of closure.
