1. A method of operating a particle beam microscope, which comprises an objective lens having an object region, wherein the method comprises: detecting at least one of light rays which emanate from a structure and particles which emanate from the structure, wherein the structure comprises at least one of at least a portion of a surface of an object and at least a portion of a surface of an object holder of the particle beam microscope; generating a surface model of the structure depending on the at least one of the detected light rays and the detected particles; determining a position and an orientation of the surface model of the structure relative to the object region; determining a measurement location relative to the surface model of the structure; and positioning the object depending on the generated surface model of the structure, depending on the determined position and orientation of the surface model of the structure, and depending on the determined measurement location.