[Qgis-user] proj 4 use degrees instead of grad

[Kristian Evers]

Julien,

Yes, PROJ 4 only understands degrees and radians (depending on how you interface with PROJ). However, PROJ 6 is also capable of understanding gradians. QGIS 3.8 is properly compatible with PROJ 6 so look out for that when it lands.

/Kristian

Fra: Qgis-user <qgis-user-bounces at lists.osgeo.org> På vegne af Julien Guilloux
Sendt: 14. juni 2019 13:04
Til: qgis-user <qgis-user at lists.osgeo.org>
Emne: [Qgis-user] proj 4 use degrees instead of grad

Hi list,

I would like to generate a polygon grid. The coordinate system i need is the old French NTF (with grad unit and Paris as first meridian).
No trouble, there is the espsg code: 4807. When looking description of 4807 in spatialrefsys, grad as unit are well indicate. So... all seem perfect.... but...

When i generate the shape grid, i notice that proj 4 consider the unit as degrees and not as grad !
That why the location of my generate shape is not good, with a difference exactly egal to a 0.9 factor (a circle in grad is 400g, a circle in degrees is 360°, so 1 grad = 0.9 degree)

Do proj 4 understand only degree coordinates ?
i try to make a personnal SRID but no success...

Thanks if you have any tip...

So long,
Julien
________________________________
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Julien-Pierre GUILLOUX

Parc national des Écrins
04 92 40 20 56 / 06 99 77 38 26
www.ecrins-parcnational.fr<http://www.ecrins-parcnational.fr/>



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