slide 70

The DN error causes the topographic face to be imperfectly removed. The displacement of the face shows a similar pattern to the topographic face. The formula for the DN error face is almost the same as the topographic face, just replacing height with the height error. The error in the DN causes the imperfect removal of the topographic face. You can see the face of displacement show the similar pattern to the topographic face. The formula for the face of DN error is almost the same as the topographic face. Just replace height with the height error.