Troubleshoot Global Reference Coordinate Projects

This section will walk you through the most common troubleshooting solutions for cases when your WGS-84 coordinate system and your project coordinate system don't match exactly as they should.

Check Measurements

Take a second set of measurements to check that you're using accurate measurements to scale your Quuppa project coordinate system and the background image.
  • Use the right tools, e.g. a laser meter and a laser pointer, to make sure you are getting accurate measurements.
  • Where possible, use longer measurements to scale the project to reduce the potential for any measurement the error multiplying, e.g. use a long corridor rather than a small meeting room to scale the whole building.

Check WGS-84 Reference Coordinates

Double check the WGS-84 coordinates that you are using to make sure you have not made a typo when inputting the coordinates to the QSP.
  • Every decimal affects the accuracy of the reference coordinates, e.g. a WGS-84 reference coordinate to 7 decimals is accurate to 1.11 cm at the equator.

Scale the Correct Image

Always scale the WGS-84 reference image to project background image rather than the other way round.
  • The best measurements you have are the ones that you have taken yourself and can check in the physical space. These are used to scale the project’s background image.
  • The WGS-84 reference image is only a visual reference to make sure that the different coordinate systems match.