[ncl-talk] land/sea mask from shapefile

[franz]

Dear ncl-Team

   I'm using NCL - version 6.3.0
   I would like to create a land-sea mask using a shapefile.
   I’ve created a shapefile from qgis and I tried to use the function 
create_mask_from_shapefile

   mask2dtCoast = new((/ny,nx/),float)
   mask2dtCoast(0:ny-1,0:nx-1) = 
create_mask_from_shapefile(lon2d_surf(0:ny-1,0:nx-1),pathfile_Coastline)

   but I've got a not expect  result:
   sea and land grid points are not consistente with the coastline 
contained in the shape file in same region of my domain :-(

   I also try to use the function shapefile_mask_data in the following 
way:

   opt = True
   opt at return_mask = True
   mask2dtCoast_surf(0:ny-1,0:nx-1) = 
shapefile_mask_data(lon2d_surf,pathfile_Coastline,opt)

   but with the same result.

   where is the error?

   thanks
Francesco T.