2.7.2.2. data.misc.arakawa – Arakawa grids

2.7.2.2.2. Content

Inheritance diagram:
 
Inheritance diagram of vacumm.data.misc.arakawa
ARAKAWA_LOCATIONS = ['t', 'u', 'v', 'w', 'f']

Strings for naming standard physical ARAKAWA_LOCATIONS on grid

ARAKAWA_POSITIONS = ['t', 'u', 'v', 'w', 'f']

Alias for ARAKAWA_LOCATIONS

class ArakawaGrid[source]

Bases: vacumm.data.misc.arakawa._ArakawaInterp_

Base class that provides a facotry and declares grid operations

are_same_locs(p0, p1)[source]

Check if to ARAKAWA_POSITIONS are the same

Example:
>>> mygrid.are_same_locs('t', 'u')
delta_loc(p0, p1)[source]

Difference of relative ARAKAWA_LOCATIONS

Return:dx,dy,dz
static factory(arg)[source]

Guess the grid type and class, and instantiate it

Params:
  • arg: An explicit grid type (ARAKAWA_GRID_TYPES), or an object with a either grid_type, arakawa_grid_type or grid_type attribute.
Return:

A ArakawaGrid children object or None if grid type has not been guessed.
interp(var, p0, p1, copy=False, mode=None, zfirst=True, **kwargs)[source]

Interpolate a variable from one location to another one using vacumm.misc.grid.regridding.shift2d() (horizontal) and vacumm.misc.grid.regridding.shift1d() (vertical)

Note

It does not change the attributes.

Params:
  • var: MV2 array with a grid.
  • p0/1: Valid ARAKAWA_LOCATIONS: 0=source, 1=destination. If p0 is None, it is guessed with vacumm.data.cf.get_loc().
  • mode, optional: Interpolation mode at boundaries (see shift2d()).
  • zfirst, optional: Perform the vertical interpolation first, then the horizontal interpolation.
  • copy, optional: Copy the variable if same location?
Example:
>>> u3d_t = CGrid().interp(u3d_u, 'u', 't', mode='extrap')
loc2loc(var, p0, p1, copy=False, mode=None, zfirst=True, **kwargs)

Interpolate a variable from one location to another one using vacumm.misc.grid.regridding.shift2d() (horizontal) and vacumm.misc.grid.regridding.shift1d() (vertical)

Note

It does not change the attributes.

Params:
  • var: MV2 array with a grid.
  • p0/1: Valid ARAKAWA_LOCATIONS: 0=source, 1=destination. If p0 is None, it is guessed with vacumm.data.cf.get_loc().
  • mode, optional: Interpolation mode at boundaries (see shift2d()).
  • zfirst, optional: Perform the vertical interpolation first, then the horizontal interpolation.
  • copy, optional: Copy the variable if same location?
Example:
>>> u3d_t = CGrid().interp(u3d_u, 'u', 't', mode='extrap')
class CGrid[source]

Bases: vacumm.data.misc.arakawa.ArakawaGrid

C Arakawa grid

f = (1, 1, 0)
grid_type = 'C'
gtype = 'C'
t = (0, 0, 0)
u = (1, 0, 0)
v = (0, 1, 0)
w = (0, 0, 1)
class AGrid[source]

Bases: vacumm.data.misc.arakawa.ArakawaGrid

A Arakawa grid

f = (0, 0, 0)
grid_type = 'A'
gtype = 'A'
t = (0, 0, 0)
u = (0, 0, 0)
v = (0, 0, 0)
w = (0, 0, 0)
class ArakawaGridTransfer(grid0, grid1)[source]

Bases: vacumm.data.misc.arakawa._ArakawaInterp_

To interpolate variables from one grid type to another

Note

This classes does not interpolate between two grids, it just interpolates between relative ARAKAWA_POSITIONS. For general interpolations, please use regrid2d().

Example:
>>> sst_a_v = ArakawaGridTransfer('C','A').interp(sst_c_t, 't', 'v')
delta_loc(p0, p1=None)[source]

Difference of relative ARAKAWA_LOCATIONS

Return:dx,dy,dz
interp(var, p0=None, p1=None, copy=False, mode=None, zfirst=True, **kwargs)[source]

Interpolate a variable from one location to another one using vacumm.misc.grid.regridding.shift2d() (horizontal) and vacumm.misc.grid.regridding.shift1d() (vertical)

Note

It does not change the attributes.

Params:
  • var: MV2 array with a grid.
  • p0/1: Valid ARAKAWA_LOCATIONS: 0=source, 1=destination. If p0 is None, it is guessed with vacumm.data.cf.get_loc(). If p1 is None, it defaults to p0.
  • mode, optional: Interpolation mode at boundaries (see shift2d()).
  • copy, optional: Copy the variable if same location?
Example:
>>> sst_a_v = ArakawaGridTransfer('C','A').interp(sst_c_t, 't', 'v')