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-                      v17
+                      v18
  * Its better to classify too few points to ground than too many.
  * Its good to preclassify more difficult areas first. [i.e. classify large buildings and steep hill tops].
+ * The tie points that you will later select will presumably avoid areas such as trees, so you don't need to really worry about these when classifying
  * In TerraScan load in a LAS file.
  * Before ground classification we should remove noisy points.