ABSTRACT
The geometric accuracy of an interpretation is expressed by geometric precision defined as the estimate of fluctuations of differences between the nominal positions and the positions obtained in the data. Geometric precision is divided into two components, one related to position and the other to shape. Precision of shape refers to the geometric elements constructed from known co-ordinates, for which the precision of planar and/or altitude positioning is also estimated. Reliability describes the statistical possibility of detection of random or systematic errors resulting from a geometric correction. Classes can be differentiated as qualitative in nature corresponding, for example, to various land covers and of ranked qualitative nature. Affectation errors may be related to characteristics of data independent of the intrinsic quality of data, to acquisition conditions or to classification algorithms used. An error matrix is established between the data produced from classification and the reference data.
