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Remove Duplicate Points

Use this dialog to remove duplicate or near-duplicate points from the application layer.

Where do I find the dialog?

Right-click in the horizontal list field for points and select Remove duplicate points...

How to use the dialog

Procedure

  1. Enter the preferred search radius (tolerance).
  2. Set the tolerance to 0 if you only want to remove points with exactly matching coordinates.
  3. Review the preview or summary of points proposed for removal.
  4. Confirm to remove duplicates and keep one representative point.

Functionality

The function identifies and removes duplicate points based on coordinates and the selected tolerance (search radius):

  • Search radius/tolerance: You can define an optional tolerance value (in the coordinate system unit) for what should be treated as a duplicate.
  • Tolerance = 0: The function behaves as before and removes only points with exactly identical coordinates.
  • Tolerance > 0: Points within the specified distance are treated as duplicates.
  • Identical points: Points with the same X, Y, and Z coordinates.
  • Partially identical points: Points with the same X and Y coordinates, but different Z (elevation).
  • Keep representative point: For duplicates, one representative point is kept and the rest are removed.
  • Preview/summary: You can review which points will be removed before final confirmation.

Note

If you have two, three, or more identical points, you will be left with one point after running the function.

Examples

Example

Before removal:

298651.991  6695717.464  10.000
298653.040  6695715.943  10.000
298654.433  6695717.357  10.000
298654.433  6695717.357  10.000  ← Duplicate
298654.433  6695717.357  10.000  ← Duplicate

After removal:

298651.991  6695717.464  10.000
298653.040  6695715.943  10.000
298654.433  6695717.357  10.000

Example with tolerance:

Input:

Point A: (100.000, 200.000)
Point B: (100.002, 200.001)

Tolerance: 0.005

Result:

One point is kept, and the near-duplicate is removed.

Handling Points with Different Elevations

Info

For points with identical X and Y coordinates (East, North), but different Z (elevation), you can set criteria for which points to remove.