The position of a survey station is given by an angle q and distance S. The standard deviations of the angle q and distance S are 20" and 0.10 m, respectively, and the corresponding coefficient is 0.50. Evaluate the covariance matrix for q and S, using radians as the units for q. Then select a reference variance of 0.0010 m², and evaluate the cofactor and weight matrices for q and S. Assign appropriate units to all elements.