epygram.geometries.RegLLGeometry
— RegLL Geometry class¶
Contains the classes for 3D geometries of fields.
- class epygram.geometries.RegLLGeometry.RegLLGeometry(name, grid, dimensions, vcoordinate, position_on_horizontal_grid='__unknown__', geoid=None)[source]¶
Bases:
epygram.geometries.AbstractGeometry.LLGeometry
Handles the geometry for a Regular Lon/Lat 3-Dimensions Field.
- TODO: Is this class really necessary. Maybe we could make only one class
with LLGeometry, RegLLGeometry and RotLLGEometry? Is a RegLLGeometry equivalent to a RotLLGeometry with a null rotation angle?
- Parameters
name – Name of geometrical type of representation of points on the Globe. Name must be ‘regular_lonlat’
grid – Handles description of the horizontal grid.
dimensions – Handles grid dimensions.
vcoordinate – Handles vertical geometry parameters.
position_on_horizontal_grid –
Position of points w/r to the horizontal. among: [‘upper-right’, ‘upper-left’,
’lower-left’, ‘lower-right’, ‘center-left’, ‘center-right’, ‘lower-center’, ‘upper-center’, ‘center’, ‘__unknown__’]
geoid – To specify geoid shape.
- getcenter()[source]¶
Returns the coordinate of the grid center as a tuple of Angles (center_lon, center_lat).
- ij2ll(i, j, position=None)[source]¶
Return the (lon, lat) coordinates of point (i,j), in degrees.
- Parameters
i – X index of point in the 2D matrix of gridpoints
j – Y index of point in the 2D matrix of gridpoints
position – lat lon position to return with respect to the model cell. Defaults to self.position_on_horizontal_grid.
- ij2xy(i, j, position=None)[source]¶
Return the (x, y) coordinates of point (i,j), in the projection.
- Parameters
i – X index of point in the 2D matrix of gridpoints
j – Y index of point in the 2D matrix of gridpoints
position – position to return with respect to the model cell. Defaults to self.position_on_horizontal_grid.
Note that origin of coordinates in projection is the center of the C+I domain.
- ll2ij(lon, lat, position=None)[source]¶
Return the (i, j) indexes of point (lon, lat) in degrees, in the 2D matrix of gridpoints.
- Parameters
lon – longitude of point in degrees
lat – latitude of point in degrees
position – lat lon position to return with respect to the model cell. Defaults to self.position_on_horizontal_grid.
Caution: (i,j) are float.
- ll2xy(lon, lat)[source]¶
Return the (x, y) coordinates of point (lon, lat) in degrees.
- Parameters
lon – longitude of point in degrees
lat – latitude of point in degrees
Note that origin of coordinates in projection is the center of the C+I domain.
- xy2ij(x, y, position=None)[source]¶
Return the (i, j) indexes of point (x, y), in the 2D matrix of gridpoints.
- Parameters
x – X coordinate of point in the projection
y – Y coordinate of point in the projection
position – position to return with respect to the model cell. Defaults to self.position_on_horizontal_grid.
Caution: (i,j) are float (the nearest grid point is the nearest integer).
Note that origin of coordinates in projection is the center of the C+I domain.