1. A method of sonar image resolution evaluation, comprising: Providing, to a processor, sonar data of a sonar image collected by a sonar receiver; obtaining a set of point objects from said sonar data based on responses of said point objects being greater than a threshold above a mean background response of said data; obtaining a resolution measurement for each of said point objects based on a peak width 3 dB down from peak intensity for each of said point object responses; dividing said image into a plurality of segments; determining a mean resolution for each of said segments based on said resolution measurements for each said point object within said segment; and determining a mean resolution for said image based on said mean resolutions of said segments.