Accuracy Check

Usage

Click UAV LIDAR QC > Accuracy Check. After entering the data path and correct information, the table will be automatically populated. You can preview the table contents. Double-click any cell to manually modify its content. Click Finish to save after confirming all information is correct.

Process

• Parameter Page:

  • Configure UTC time zone offset, District, Design Organization, engineer, UAV model, and SN number on this page. Select the required tables for processing by checking the corresponding boxes.
  • Click Next to continue after confirming the inputs.
    

• Data Page:

  • Set paths for required data on this page. First, set the LiGeoreference project path. If control point tables were selected on the parameter page, provide the control point file path. Optionally set flight planning file paths (KML/KMZ files) as needed. Modify the report output path for custom saving locations.
  • Configure target type and size for the control point file. Currently supports four recognizable target types: square black-white target, square color target, 2-layer concentric circle target, and 3-layer concentric circle target. Correct target identification is essential for subsequent processing.
  • Click Next to continue after confirming the inputs.
    

• Control Point Page:

  • After completing the data page, a control point import window will appear. Select the four required fields: control point ID, X, Y, and Z coordinates. Click Confirm to import.
  • The control point page contains five buttons from left to right: Import Control Points, Update Control Point Data, Identify Targets, Manually Identify Targets, and Delete Control Points. Use these to re-import data, update modified points, re-identify targets, manually select targets in point cloud view, or delete selected control points.
  • Select control point types from the dropdown: Adjustment Points, Check Points, or Strip Check Points.
  • Adjust the correlation coefficient slider: Lowering the coefficient reduces the recognition threshold and makes recognition easier, but it may cause false recognition. Increasing the coefficient raises the recognition threshold, making recognition stricter and more accurate, but it may cause recognition to fail.
  • Click Next to proceed to subsequent tables after updating data.
    

• Flight/Measurement Specifications Plan: Records flight route planning details including flight parameters and laser scanner settings.

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• Adjustment Points/Verification Points/InterCourse Verification Points: Displays flight routes and control points graphically within the table.

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• UAV Laser Accounting Record Book: Lists all flight line information with graphical route representations.

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• Optimal Trajecory Analysis Record Book (Tightly Coupled Method): Statistics for each trajectory segment from LiGeo project, including average/minimum satellite numbers, average/maximum DOP values, average/maximum round-trip differences, average/maximum attitude accuracy, average/maximum position accuracy, and fixed solution statistics.

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• Inter-course Verification Quality Control Table: Lists all control points between flight strips, showing information for each adjacent strip pair. Switch between different adjacent strips using the list.

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• Original Data Uniformity Inspection Table: Calculates elevation differences between control points and measured positions. Switch between different control points using the list.

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• Adjustment Point Verification Accuracy Control Table (Elevation): Computes elevation accuracy for all adjustment points. Switch between different control points using the list.

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• Adjustment Point Verification Accuracy Control Table (Horizontal Position): Computes horizontal accuracy for all adjustment points. Switch between different control points using the list.

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• Point Density Verification Accuracy Control Table: Perform LiDAR point density checks with interactive operations:

  • Modify area name in text editor, click Point Density button, select area in viewer (left-click start point, double-click to confirm area).
  • Click Delete to remove selected row from list.
  • Click Clear to remove all data.
  • All operations automatically update the table data.
    

• Accuracy Control Table for Inspection and Measurement Results (UAV Laser Re-measurement):This sheet records the inspection accuracy data from UAV LiDAR re-survey, including average elevation of check points, measured elevation, tolerance limits, and pass/fail status of each check point.

  

• Accuracy Control Table for Inspection and Measurement Results (Verification Points & Elevations):This sheet records elevation inspection accuracy data of validation points, including average elevation of validation points, measured elevation, tolerance limits, and pass/fail status of each validation point.

  

• Inspection and Measurement Result Accuracy Control Table (Verification Points & Horizontal):This sheet records horizontal inspection accuracy data of validation points, including average horizontal coordinates of validation points, measured horizontal coordinates, tolerance limits, and pass/fail status of each validation point.

  

• Report Output:

  • Click Finish to generate and save the report to the target path after completing all tables.