How to extract information from images? In general, methods for extracting information from remote sensing images can be subdivided into two groups:
Information extraction based on Visual Image Interpretation. Typical examples of this approach are visual interpretation methods for land use or soil mapping. Acquisition of data from aerial photographs for topographic mapping is also based on visual interpretation.
Information extraction based on semi-automatic processing by computer or Digital image classification. Examples of this approach include automatic generation of DTMs, digital image classification and calculation of surface parameters.