Abstract
In the engineering geologic field, statistical analysis by means of Schmidt's net on geological separations which developed in the rock foundation of structures, have prevailed. The statistical description of separations is preferred orientation and frequency (usually described as %), by which geomechanical conditions of the rock foundation are treated.
In a polar equal area net of Schmidt's net, areal error within 15% among the central portion and a periferal portion in the net occurs, which is caused by calculating with a same sized and shaped pointcounter. Therefore, preferred orientation of a population can not be accurately described.
For the adequate counting in statistical analysis, a basic theory of a correct point counter and its counting operation are discussed.
