Lateral Boundary Conditions Scripts

Matlab: Lateral Boundary Conditions Scripts

This page describes several Matlab scripts to process ROMS lateral boundary conditions data.

obc_roms2roms.m

Interpolates requested 2D or 3D lateral boundary conditions variables between two ROMS application grids. The receiver grid must be inside of the donor grid. This function is intended for down-scaling or nesting applications. The horizontal/vertical coordinates for the donor and the and receiver grids are specified with array structures D and R, which are built elsewhere using script get_roms_grid.m for efficiency and functionality.

B = obc_roms2roms  (ncname, D, R, VarList, Tindex, boundary, method, offset, RemoveNaN)

On Input:

ncname:	Donor grid NetCDF file name containing variables to process (string)
D:	Donor grid structure containing all horizontal and vertical variables (struct array)
R:	Receiver grid structure containing all horizontal and vertical variables (struct array)
VarList:	List of variable names to process (cell array)
Tindex:	Time record index to process (scalar)
boundary:	Lateral boundary condition switches (logicals) of the grid edges to process (struct array):

boundary.west	Western edge
boundary.east	Eastern edge
boundary.south	Southern edge
boundary.north	Northern edge

method:

Interpolation method in TriScatteredInterp (string):

'natural'	natural neighbor interpolation
'linear'	linear interpolation (default)
'nearest'	nearest-neighbor interpolation

offset:	Number of extra points to use when sampling the donor grid so it is large enough to contain the receiver grid (default 5)
RemoveNaN:	Switch to remove NaN values from interpolated variable with a second interpolation step using the nearest-neighbor method (default false)

On Output:

B:	Interpolated requested 2D or 3D lateral boundary variables (struct array)