MATLAB: I have 11 degree resolution montly temperature data in the excel format, i need to convert into .5.5 degree resolution. how can i solve this problem

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I have a daily temperature of 1*1degree resolution, I need to convert into .5*.5 resolution. this data is initially available in .grd format, I converted it into excel format and found the monthly data. I wish to know is there any regridding or interpolation methods available to solve this problem?

Best Answer

Read about interp2. You have to do interpolation.

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MATLAB: Bilinear interpolation of gridded data

Hi! This how i do this

clc,clear
load Variables.mat
[m,n,k] = size(predictor);
lon = linspace(59.06,120.93, m);
lat = linspace(4.18,40.46, n);
lon1 = 60:2.5:100;                      % new range
lat1 = 5: 2.5:40;
[LAT, LON] = meshgrid(lat,lon);         % original mesh
[LAT1, LON1] = meshgrid(lat1,lon1);     % new mesh
predictor1 = zeros([size(LAT1) k] );            % preallocation
for i = 1:k
    pred = predictor(:,:,i);
    predictor1(:,:,i) = interp2(LAT,LON,pred,LAT1,LON1);
end
    % DRAW SOMETHING !
R = predictor(:,:,1);
R1 = predictor1(:,:,1);
s = pi/180;
[x,y,z] = sph2cart(LAT*s,LON*s,R);
[x1,y1,z1] = sph2cart(LAT1*s,LON1*s,R1);
%%
plot3(x,y,z,'b')        % original data: blue lines
hold on
surf(x1,y1,z1)          % interpolated data: color surface
hold off
axis equal

MATLAB: How to regrid the spatial data in netcdf format directly without reading it

You could process one slice at a time. nc4 format is HDF5 underneath, which could be compressed, but nc4 defines that when compression is in place, the compressed data must be chunked in order to make it more efficient to access parts of it. There is the question of how the chunking is done; I suspect that probably layers are kept separate.

oldsize = [10902, 6818, 8456);
factor = 0.004/0.05;
%we read and process one slice first in order to get accurate dimensions for
%preallocating the overall data.
first_slice = ncread(filename, name_of_variable, [1 1 slice], [inf inf 1]);
newdata = imresize(firstslice, factor);
newdata(end, end, oldsize(3)) = 0;       %resize to hold it all
for slice = 2 : oldsize(3)
    thisslice = ncread(filename, name_of_variable, [1 1 slice], [inf inf 1]);
    newslice = imresize(thisslice, factor);
    newdata(:,:,slice) = newslice;
end

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MATLAB: Bilinear interpolation of gridded data

MATLAB: How to regrid the spatial data in netcdf format directly without reading it

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