Some possibilities of digital and analogue evaluation of satellite data

The high data rate and information flow of remote sensing systems call for the implementation of automatic analogue and digital interpretation techniques. Based on ERTS-1 data representing typical European scenes digital and analogue image evaluation was performed. A statistical analysis of the data, as first step of the evaluation process, showed high correlation between both infrared channels. Feature identification was also performed by a digital quicklook method which takes into consideration the different reflection properties of surface. The possibility of data reduction for operational applications is discussed. The results obtained digitally are compared to those obtained by the analogue evaluation method of density slicing.