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Distance calculated in different software (MapInfo and QGIS) has given me differences in distance values. To be more precise, it's mostly happening when the distance is more than 25 miles. I doubt this is because QGIS is always including the earth curve (3D) while calculating distances, while in MapInfo, it's directly measuring the distances in 2D form. Why I am sure about 3D and 2D impact is because the distance I am getting is always huge in QGIS when compared.

If this is the case, how can we calculate the distances in MapInfo with the earth curve included in measurements and should come similar to QGIS?

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  • can you gives some examples of the two distances? is one in miles and the other in metres?
    – Ian Turton
    Feb 24, 2021 at 17:11
  • No. Both are in miles only. Feb 24, 2021 at 17:48

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QGIS does not always compute ellipsoidal areas. User can select planimetric areas with the project settings.

enter image description here

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  • Thanks. As suggested above, I have got the right answer just by switching to other options. Mar 14, 2021 at 14:29
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In MapInfo Pro: Be aware of Spherical or Cartesian calculus (see "map options" dialog). Check if your tool calculates ObjectLen () or CartesianObjectLen() or SphericalObjectLen() and if it matches your map option calculus mode.

Some more info here: https://groups.google.com/g/mapinfo-l/c/ZQum8S9d4oU/m/quO8sDq6JW8J

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