Patent ID: 8675206

Claim:
A measurement method for measuring a shape of a test surface using an optical system, the measurement method comprising: a step of setting each of a plurality of measurement ranges so that a portion of the test surface is used as one measurement range and one measurement range overlaps a portion of at least another measurement range to form an overlap region; a step of measuring a shape of the test surface in each of the plurality of measurement ranges; and a step of obtaining a shape of the test surface over the plurality of measurement ranges by stitching together pieces of data of the shapes of the test surface obtained in the measuring step, wherein the measuring step includes a step of measuring a shape of the test surface in a first measurement range among the plurality of measurement ranges at a first resolution, and a step of measuring a shape of the test surface in a second measurement range different from the first measurement range among the plurality of measurement ranges at a second resolution different from the first resolution, and wherein the first resolution and the second resolution are made different from each other by changing characteristics of the optical system.