The Check Points tool allows you to verify the vertical accuracy of a drone dataset. You can compare the elevations of your DSM to independent points visible in the viewport. Those points usually come from a GNSS or total station survey. 

The tool delivers vertical accuracy statistics and allows you to export an accuracy report. 

The Check Points tool appears in the EXPORT tab and works only if an elevation terrain and some points are visible in the project. 

Quick Guide 

  1. Drag and drop the set of check points or click on "choose files" to load those points.
  2. Go to the EXPORT tab.
  3. Click on the "Check Points" button.
  4. The check point statistics appear in a pop-up window.

Hint! All the points which are visible in the viewport are included in the accuracy check. Make sure that only your ground check shots are active before running the Check Points tool.

Export accuracy report

After using Check Points, you can save the results in a report.

  1. In the pop-up window, click on "Save Details" to generate an accuracy report.
  2. Specify a file name and a storage location and click Save.
  3. A .txt file which contains the statistics and a .csv file which contains the check point measurements are created and automatically opened. 

Tips and tricks

  • Based on the check point statistics you can even enhance the vertical accuracy of your drone data. Use the average error to offset the elevation terrain.
  • Make sure that check points and drone data are defined in the same coordinate and elevation systems.