[Marble-bugs] [marble] [Bug 350105] Incorrect Flat Map representation

[Dennis Nienhüser]

https://bugs.kde.org/show_bug.cgi?id=350105

Dennis Nienhüser <nienhueser at kde.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEEDSINFO
         Resolution|---                         |WAITINGFORINFO
                 CC|                            |nienhueser at kde.org

--- Comment #4 from Dennis Nienhüser <nienhueser at kde.org> ---
>From Google Earth Help: "What is a Map Projection? A map projection is a
mathematical expression that is used to represent the round, 3D surface of the
earth on a flat, 2D map. This process always results in distortion to one or
more map properties, such as area, scale, shape, or direction. Because of this,
hundreds of projections have been developed in order to accurately represent a
particular map element or to best suit a particular type of map."

The flat map and mercator projections available in Marble are not supposed to
preserve area measure.

You might be looking for a projection from
https://en.m.wikipedia.org/wiki/Cylindrical_equal-area_projection
There is a (not yet finished) patch at
https://git.reviewboard.kde.org/r/123538/ which implements the Gall-Peters
projection, see https://en.m.wikipedia.org/wiki/Gall–Peters_projection . Maybe
you're looking for that one?

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