how to extrapolate a non uniform 3d data?

hi

i have a dataset which doesnt have a uniform difference between the lat and lon even though the data resolution is 5.5x3.5km resolution. i have to extrapolate the data into a 1˚x1˚ resolution. i tried using a code however it was showing some error. how do i solve this error?

the above picture shows the lattitudes.

clear all
close all
clc
data=('D:\Sreeraj\Earthdata tropomi\New folder\S5P_OFFL_L2__NO2___01012021.nc');
% ncdisp(data)
lon_plot=ncread(data,'/PRODUCT/longitude');
lati_plot=ncread(data,'/PRODUCT/latitude');
ak=ncread(data,'/PRODUCT/averaging_kernel');
lat=lati_plot(1,:)';
lon=lon_plot(:,1);


[X,Y]=meshgrid(lon,lat);
%resampling data
[X1,Y1]=meshgrid(lon(1):1:lon(end),lat(1):1:lat(end));
for i=1:34
v=interp2(X,Y,ak(:,:,i),X1,Y1);  
v1(:,:,i)=v;
end

Error using griddedInterpolant

The grid must be created from grid vectors which are strictly monotonically increasing.

Error in interp2>makegriddedinterp (line 228)

F = griddedInterpolant(varargin{:});

Error in interp2 (line 136)

F = makegriddedinterp(X, Y, V, method,extrap);

Error in tropomiresample (line 21)

v=interp2(X,Y,ak(:,:,i),X1,Y1);

[Walter Roberson]

Your latitudes are decreasing in both directions. You need to flipud() and fliplr() your arrays.

Answer 1

[KSSV]

[X1,Y1]=meshgrid(lon(1):1:lon(end),lat(1):1:lat(end));

Check the dimensions of X1, Y1..they might be empty. You have asked the similiar question here : https://in.mathworks.com/matlabcentral/answers/1586789-how-to-solve-the-error-the-grid-must-be-created-from-grid-vectors-which-are-strictly-monotonically-i?s_tid=prof_contriblnk .

Check the answer and follow the same.