Changing the calculation method

The statistical calculations during a Positional Accuracy Assessment session can be adjusted by changing the calculation method. You can choose to use either the National Geospatial-Intelligence Agency (NGA) standard or United States Geological Survey (USGS) standard. Each one calculates the values based on the specifications defined by those agencies.

When the calculation method is changed, the statistics are automatically recalculated.

Steps:

1. Start ArcMap.
2. If necessary, load data in the map.
3. On the main menu, click Customize > Toolbars > Data Reviewer.
4. On the Data Reviewer toolbar, click Data Reviewer > Positional Accuracy Assessment.

   The Positional Accuracy Assessment toolbar appears.

5. Start a PAAT session.
6. Click the Show Results button on the Positional Accuracy Assessment toolbar.

   The Positional Accuracy Session Results dialog box appears.
7. In the Settings area of the Session Results tab, click the Calculation Method drop-down arrow to change the calculation method.

   The statistics are recalculated using the method you choose.

8. Click Close.