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I want to calculate the area with $area function in QGIS 2.99 but the operation gave me a wrong value.

Here is a picture comparing the results between QGIS 2.99 and QGIS 2.18. The right side is QGIS 2.18 and its OK, I compare the result with ArcGIS.

enter image description here

Here are the projection properties from each one.

QGIS 2.99

enter image description here

QGIS 2.18 enter image description here

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    You need to also show your project properties screen - specifically the ellipsoid settings.
    – ndawson
    Commented Feb 21, 2018 at 19:36
  • Sorry - that's not what I meant. I mean the first tab in "Project Properties", which shows the project ellipsoid setting.
    – ndawson
    Commented Feb 22, 2018 at 0:06
  • ndawson. I changed the pictures. But I saw something. When in QGIS2.99 I select the buttom "Ninguna proyección" it works fine and give the right value. ¿Do you know why?
    – Manuel Alejandro
    Commented Feb 22, 2018 at 0:39
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    Sorry - still giving the wrong picture. I need the first tab: "General"
    – ndawson
    Commented Feb 22, 2018 at 1:37
  • ndawson, Thanks a lot!! I know now why it's happen. I put the pictures. The ellipsoid was different in QGIS 2.99. Again Thanks a lot.
    – Manuel Alejandro
    Commented Feb 22, 2018 at 17:33

1 Answer 1

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@ndawson show me why the $area function give different values.

We have to have the same ellipsoid setting, it must be configured in QGIS2.99.

This picture show where we have to set the ellipsoid.

enter image description here

In my case I selected "None/Planimetric" and it worked.

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