Quality report - PIX4Dmatic

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PIX4Dmatic generates a quality report that can be used to get an overview of the project and assess its accuracy and quality.

The following is available:

  • General report is generated after running the Calibrate or Reoptimize cameras step:
    • Click the Report Pix4Dmatic_report_panel.png panel.
      Pix4Dmatic_quality_report.png
  • Detailed quality report (.txt). To export the detailed quality report:
    • In the Report panel, Click exportButton.png
    • On the Menu bar > File, click Export quality report...

The following table describes the content of the quality report:

Project summary
Version The version of the software used to process the project.
Project name The name of the project.
Date The date the project was processed.
Project details
Average GSD (units) The average ground sampling distance of the original images. For more information, see Ground sampling distance (GSD).
Project coordinate reference system

The horizontal and vertical coordinate system used for processing.

When the vertical coordinate reference system is not specified, the base ellipsoid of the horizontal coordinate is used. 

Camera name(s) The name of the camera model(s) used to capture the images.
Number of images The total number of images.
Calibration
Image scale The value of the image scale used for keypoints extraction.
  • 1: Original image size.
  • 1/2: Half image size.
  • 1/4: Quarter image size.
  • 1/8: Eighth image size.

For more information, see Processing options - Image Scale.

Maximum extracted key point
  • AutomaticKeypoints parameter set to Auto.
  • Value: The value of Keypoints > Custom parameter set for processing.

For more information, see Processing options - Keypoints.

Reoptimize
  • True - Reoptimize cameras option was enabled.
  • False - Reoptimize cameras option was disabled.

For more information, see Processing options - Reoptimize cameras.

Duration The time needed for processing the Calibrate step.

When Reoptimize cameras option is used, the time corresponds only to the Reoptimize camera pipeline and not to the whole Calibrate step.

 
Completed (%) The percentage of images that have been calibrated, i.e., the number of images that will be used or have been used for the reconstruction.
Calibrated images The number of calibrated images.
Uncalibrated images The number of uncalibrated images.
Camera optimization (%) The percentage of the difference between initial and optimized focal length of the camera.
Median number of matches per camera The median of keypoints per image. Keypoints are characteristic points or unique combinations of pixels that are detected in an image.
Tie points 
Number of Tie Points The total number of Tie Points (GCPs, MTPs, and checkpoints).
GCP coordinate reference system The coordinate system of the ground control points.

When the vertical coordinate reference system is not specified, the base ellipsoid of the horizontal coordinate is used. 

 
Mean position error X/Y/Z (unit) The average error in each direction, i.e., XYZ, of the ground control points. For more information, see How are the GCP Errors defined in the Quality Report?.
Sigma position error X/Y/Z (unit) The standard deviation of the error in each direction, i.e., XYZ, of the ground control points. For more information, see How are the GCP Errors defined in the Quality Report?.

RMS position error X/ Y/Z (unit)

The root mean square error in each direction, i.e., XYZ, of the ground control points. For more information, see How are the GCP Errors defined in the Quality Report?.
 
Tie Point name The name of the Tie Point.
Type The type of the Tie Point:
  • GCP (Ground Control Point)
  • Checkpoint
  • MTP (Manual Tie Point)
Accuracy X/Y (unit) The horizontal accuracy of the initial position of the ground control point.
Accuracy Z (unit) The vertical accuracy of the initial position of the ground control point.
Position error X (unit) The difference between the computed and the initial position of the ground control point in the X-axis, i.e., initial position - computed position.
Position error Y (unit) The difference between the computed and the initial position of the ground control point in the Y-axis, i.e., initial position - computed position.
Position error Z (unit) The difference between the computed and the initial position of the ground control point in the Z-axis, i.e., initial position - computed position.
Reprojection error min (px) The minimum reprojection error of the Tie Point on images.
Reprojection error max (px) The maximum reprojection error of the Tie Point on images.
Reprojection error mean (px) The average distance between where the ground control point was marked in an image and the reprojection of the computed position of the ground control point in the same image.
Marks The ratio between the number of marks and the number of valid reprojections.
Densification
Density Defines the density of the point cloud:
  • Optimal (Default): A 3D point is computed for every 8th pixel of the original image. 
  • High: A 3D point is computed for every 2nd pixel of the original image.
  • Low: A 3D point is computed for every 32rd pixel of the original image. The final point cloud is computed up to 4 times faster and uses up to 4 times less RAM than Optimal density.

For more information, see Processing options - Density.

Minimum matches Minimum Number of Matches (2-6, 3 default) represents the minimum number of valid re-projections of this 3D point to the images.

For more information, see Processing options - Minumum matches.

Duration The time needed for processing the Densify step.
Number of points The total number of points generated in the dense point cloud.
Digital Surface Model (DSM)
Resolution The resolution used to generate the DSM. If the mean GSD computed at the Calibrate step is used, its value is displayed.
Surface smoothing The radius of the median filter used for surface smoothing of the DSM (0 - 5, 2 - default).

For more information, see Processing options - Surface smoothing.

Interpolation The Interpolation parameters affect the completeness of the generated DSM:
  • Enabled (default), the entire area of the DSM is filled.
  • Disabled, only areas where the dense point cloud is generated are reconstructed in the DSM model. 

For more information, see Processing options - Interpolation .

Duration The time needed for processing the Digital Surface Model (DSM) step.
Image resolution (px) The resolution of the generated DSM.
Orthomosaic
Resolution The resolution used to generate the Orthomosaic. If the mean GSD computed at the Calibrate step is used, its value is displayed.
Duration The time needed for processing the Orthomosaic step.
Image resolution (px) The resolution of the generated Orthomosaic.
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