Error: Black Holes in the Point Cloud - green, orange and yellow Rectangles in the Overlap Map in the Quality Report

Error

  • Green, orange and yellow rectangles in the Overlap map in the Quality Report. 
  • Black holes (black rectangles or sharp triangles) in the model where no data was generated.

 

overlap_QR_stripes.png
Figure 1. Quality Report

 

Figure 2. Point Cloud with black rectangles

  

Description

  • Green, orange and yellow rectangles in the Overlap map in the Quality Report. 
  • Lower accuracy in the position of the 3D points.
  • Black holes (black rectangles or sharp triangles) in the Point Clouds.
  • Rectangles in the DSM.

 

Cause

This issue appears if there is not enough frontal and/or side overlap. 

Even if there are enough keypoints found on each image, there might be some areas that can only be seen in 2 images.

The Densified point cloud is generated using the Automatic Tie Points and, by default, only contains keypoints that can be identified in at least 3 images. All outputs depending on the Densified point cloud will be affected.

 

Solutions

Use keypoints found in 2 images as keypoints for the Point Cloud Densification:

1. In the menu bar, click Process > Options...
2. Select the tab Point Clouds.
3. In the section Minimum Number of Matches, instead of 3, select 2.
4. Click OK.
5. Process step 2 again.

If  the problem persists: 

Add and mark Manual Tie points on the problematic areas, and process step 1 again. For more information about how to add Manual Tie Points: 202560349.

If  the problem persists: 

Fly again using higher frontal and side overlap and process the project again. For more information about the flight plan design: 202557409.

 

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