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ENVI

Fix Tie Points

Fix Tie Points

  • Fix the tie point: Select the tie point in the Image to Image GCP List dialog, and click Goto to jump to that point. Adjust the location of the crosshairs to the desired location. Click Update in the Image to Image GCP List to update the location of that point. ENVI immediately calculates and displays a new RMS error.
  • Turn the tie point off: Select the tie point in the Image to Image GCP List dialog. Click On/Off. The point turns green to indicate that it is off and no longer being used, and the RMS error is updated. Turn the point back on by clicking On/Off again.
  • Delete the tie point: Select the tie point in the Image to Image GCP List dialog. Click Delete. The point is removed from the dialog list, and the RMS error is updated.
  • Use THOR to automatically turn off bad tie points: In the Review Tie Points panel, set the Maximum allowable RMS per GCP parameter to the desired RMS threshold, then click Apply. The tie points with the greatest RMS errors are turned off until no tie point has an RMS greater than the set value. This is a quick way to remove the greatest errors. To turn the points back on, select them in the Image to Image GCP List dialog, then click On/Off.



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