import numpy as np
from polaris.mesh import QuasiUniformSphericalMeshStep
from polaris.mesh.base.so.background import build_southern_ocean_background
[docs]
class SOBaseMesh(QuasiUniformSphericalMeshStep):
"""
A step for creating Southern Ocean (SO) regionally refined meshes
"""
def setup(self):
"""
Add some input files
"""
self.add_input_file(
filename='high_res_region.geojson',
package='polaris.mesh.base.so',
)
super().setup()
[docs]
def build_cell_width_lat_lon(self):
"""
Create cell width array for this mesh on a regular latitude-longitude
grid
Returns
-------
cellWidth : numpy.array
m x n array of cell width in km
lon : numpy.array
longitude in degrees (length n and between -180 and 180)
lat : numpy.array
longitude in degrees (length m and between -90 and 90)
"""
config = self.config
section = config['spherical_mesh']
min_res = section.getfloat('min_cell_width')
max_res = section.getfloat('max_cell_width')
dlon = 0.1
dlat = dlon
nlon = int(360.0 / dlon) + 1
nlat = int(180.0 / dlat) + 1
lon = np.linspace(-180.0, 180.0, nlon)
lat = np.linspace(-90.0, 90.0, nlat)
cell_width = build_southern_ocean_background(
lat=lat,
lon=lon,
high_res_km=min_res,
low_res_km=max_res,
region_filename=self.work_path('high_res_region.geojson'),
)
return cell_width, lon, lat