Abstract: In the roughness measuring apparatus, a parameter to be evaluated and its maximum value are set by using a keyboard. If there is an evaluated area with a roughness over the maximum value among the roughness values which have been computed, a roughness is computed by using only measurement data of an evaluated area with a roughness value which is the same or under the maximum value, and a roughness is computed by using only measurement data of an evaluated area with a roughness value over the maximum value.

Abstract: An automatically shape calculating method and apparatus for contour shape measuring machines, by which a geometric shape value and a geometric shape boundary value are calculated from shape data. A geometric shape boundary is provisionally set in accordance with the shape data, which is obtained by measuring a workpiece, and then geometric shape calculation areas are set in areas except for the vicinities of the provisionally set point, a measurement starting point and a measurement ending point. A geometric shape value of the shape data is calculated while a geometric shape of the shape data is determined under geometric shape recognition conditions for each of the set geometric shape calculation areas. The geometric shape boundary value is calculated from the calculated geometric shape value, and the calculating results are output.