SOME MEASURES TO IMPROVE THE ROBUSTNESS OF GEOMETRICAL INTERROGATION

After analysing the source of errors which leads to the inaccuracies of the line intersection algorithms，we propose a line-line intersection criterion and three categories of the point-point coincidence criterion based on the associative topological properties，and use them to set up the inner relations of the tolerance values with their different geometrical interpretations to help solving the numerical uncertainties in geometrical interrogations．