1. A method for determining coordinates of a feature comprising: providing a first image including the feature, the first image comprising a plurality of pixels; determining a first estimate of coordinates of the feature to within a fraction of a pixel; translating the feature relative to the pixels by a pixel translation value, wherein the sum of the pixel fraction and pixel translation value is an integer value; determining a second estimate of coordinates of the translated feature to within a fraction of a pixel; and summing the pixel fractions of the first estimate with the second estimate to derive a refined estimate of coordinates.