Logical inference

As the term states, Logical inference means that the interpreter applies reasoning. In the reasoning, the interpreter uses acquired professional knowledge and experience. Logical inference is, for example, concluding that a rectangular shape is a swimming pool because of its location in a backyard garden near to a house. Sometimes logical inference alone is insufficient to interpret images; then field observations are required. 

Consider the areal photograph in the Figure below. Are you able to interpret the material and function of the white mushroom-like objects in the photograph below? A field visit would be required for most of us to relate the different features to elements of a house or settlement.