Distortions and Artifacts in the Orthomosaic

Cause

The orthomosaic is generated based on the DSM that was created from the Densified Point Cloud. Thereby, errors and noise present in the Densified Point Cloud will be reflected in the orthomosaic. These distortions occur because Orthorectification is used instead of Photo Stitching, for more information: 202558869.

When computing the Densified Point Cloud, the altitude of the points will not be perfectly estimated. There are always some errors and noise that are minimized for good datasets (high overlap, good visual content of the images, use of GCPs, etc.).

These errors and noise result in altitude differences for points that are supposed to be at the same altitude, such as points that belong to the same roof edge of a building or the same edge of a bridge. This altitude difference explains the distortions that appear in the orthomosaic on building edges, bridges, etc. 

 

Solutions

Orthomosaic before editing Orthomosaic after editing using the Mosaic Editor
Figure 1.
  • Improving the aspect of bridges: 202559959
Orthomosaic before editing Orthomosaic after editing using the Mosaic Editor
Figure 2.

 

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