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interp2rhogrid.m
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interp2rhogrid.m
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%=========================================================================%
% interp2rhogrid.m
% interpolate u- or v-grid to rho-grid.
%
% use: function [varout] = interp2rhogrid(input_grid, init_grid)
%
% Input:
% input_grid (3-D array): data to regrid.
% init_grid (string): current grid of input_grid data (e.g. 'u').
%
% Output:
% rho_grid: data from input_grid regridded to rho-grid.
%
% Author: Z. Wallace
% Last edit: 4 April 2018
%=========================================================================%
function grd_out = interp2rhogrid(grd_in, grd_init)
msg = ' was passed in as the initial grid';
switch grd_init
case('u')
disp(strcat(grd_init,msg));
[x,y,z] = size(grd_in);
grd_out = zeros(x+1,y,z);
% Set end members of new grid to end members of initial grid.
% This replaces the lost information at the grid boundary that
% occurs during interpolation.
grd_out(1,:,:) = grd_in(1,:,:);
grd_out(end,:,:) = grd_in(end,:,:);
% interpolate data from u grid to rho grid
grd_out(2:end-1,:,:) = (grd_in(1:end-1,:,:) + grd_in(2:end,:,:))*0.5;
case('v')
disp(strcat(grd_init,msg))
[x,y,z] = size(grd_in);
grd_out = zeros(x,y+1,z);
% Set end members of new grid to end members of initial grid.
% This replaces the lost information at the grid boundary that
% occurs during interpolation.
grd_out(:,1,:) = grd_in(:,1,:);
grd_out(:,end,:) = grd_in(:,end,:);
% interpolate data from v grid to rho grid
grd_out(:,2:end-1,:) = (grd_in(:,1:end-1,:) + grd_in(:,2:end,:))*0.5;
otherwise
msg = "Invalid init_grid parameter. Please use 'u' or 'v'";
disp(msg);
return
end
end