[ncl-talk] Unable to get the latitude on Y axis on a map

[Maud Leriche]

Hello everybody,

With one of my student, we possibly found a bug in ncl (6.5.0). 
We want to plot the orography of our domain simulation on a map. We are using the MesoNH model (http://mesonh.aero.obs-mip.fr/mesonh54/, 5.4.1) with a polar projection defined with :
Latitude at the centre of the domain (LAT0) = 78.5°N
Longitude of the centre of the domain (LON0) = -86.41°O
Parameter of the conformal projection (RPK) = 1 (corresponding to stereographic polar projection)

The graph obtained from our ncl script doesn’t indicate the latitude on the Y axis. Instead the Y axis indicates longitude. 

We think that the problem comes to ncl because if the conformal projection parameter is inferior to 0.72, the plot is right but if this parameter is > 0.71, ncl doesn’t indicate the latitude on the Y axis.

The tar file containing our ncl script, the netcdf file output of our simulation and the obtained plot can be downloaded here:
https://framadrop.org/r/uKKEspjOMJ#DWaQaXTd2jhmXGXuJpz85vVjfgWJB2HqSFZTdZR09Qc=

Below is the obtained plot using a RPK = 0.71.

Many thanks in advance for your help.

Regards,

Maud

Maud LERICHE
Chargée de recherche CNRS - HDR
Laboratoire d’Aérologie (LA) - France
Chercheuse invitée
Centre pour l’étude et la simulation du climat 
à l’échelle régionale (ESCER) - PK 7630
Université du Québec à Montréal
Case postale 8888, succursale Centre-Ville
Montréal (Québec) Canada
H3C 3P8


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