Changing the Default or Preference Setting for Calculations - MapInfo_Pro - 2023

To change the default preference setting for distance and area calculations:

1. On the PRO tab, click Options, and Map Window to open the Map Preferences dialog box.
2. Select the Projection tab.
3. In the Distance/Area using group, choose a calculation method:
   • Spherical - The Spherical calculations measure distance according to the curved surface of the Earth. Spherical is the default. The data is first converted to Latitude/Longitude and then a calculation is produced. Lat/Long data will always use spherical calculations.
     Note: Non-Earth data cannot use Spherical calculations, because the data cannot be converted to Latitude/Longitude.
   • Cartesian - The Cartesian method performs calculations on data projected onto a flat plane. Cartesian coordinates (x,y) define the position of a point in two-dimensional space by its perpendicular projection onto two axes which are at right angles to each other. Long/Lat projections cannot use Cartesian calculations.
4. Click OK to close the dialogs and save your settings.