Change Detection Analysis encompasses a broad range of methods used to identify, describe, and quantify differences between images of the same scene at different times or under different conditions. You can use tools such as Band Math or Principal Components Analysis independently, or in combination, as part of a change detection analysis. In addition, the routines found under the Toolbox menu Change Detection offer a straightforward approach to measuring changes between a pair of images that represent an initial state and final state. Use Change Detection Statistics for classification images; use Change Detection Difference Map for gray scale (single-band) images.