I have two aerial photos of the same location taken at two different dates. Is there a way to compare the % difference between those two images using GRASS or is there a better tool?

Sorry, also if there are other tips and tricks I am relatively new at this.

  • like change detection? – nickves Jun 21 '16 at 22:31
  • yep, exactly. but not just determining if it has happened, but by how much. a quantitative result. – nick vanstrijp Jun 22 '16 at 14:07

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