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MashUp

-                      v20
+                      v21
  * Instead, take two parallel flightlines with 30-50% overlap (more overlap = less chance of detection)
  * Along the mid line of the intersection, find areas where the height of the surface changes in an clear and predictable fashion, with reasonable sampling density (e.g. a road leading up a hill, or rooftops with their peaks going across-track).
  * If there is an along-track shift between features, there is a roll error (size of shift proportional to error)
+ * If there is an along-track shift between features, there is a heading error (size of shift proportional to error)
  * If there is no error, features should overlap
+ * Adjust until lines up
 === Pitch error slope ===