how to merge two NetCDF4 files into one

Hi everyone, i am currently working on Sentinel 5P Tropomi data. the data is available in the format of NetCDF6. i am trying to merge two images into one. i need the lattitude, longitude and NO2 column data in the new merged file. is it possible to merge two files and have the merged file have all the varaiables which the two files have. if so please let me know how i can merge these two files in Matlab.

[KSSV]

Yes happily it can be merged.....shared your files so that we can have a look.

[Sreeraj R]

yes sir....sorry there is a correction the data format is not NetCDF6 but NetCDF4 (not NetCDf4_classic) . i have attched the google drive link for the data

https://drive.google.com/drive/folders/1dbJs6Rb6evI3jvyT6BTSHrGF4O9ryqmC?usp=sharing

Answer 1

[KSSV]

file1 = 'tropomi1.nc' ;
file2 = 'tropomi2.nc' ;

x1 = ncread(file1,'/PRODUCT/longitude');
y1 = ncread(file1,'/PRODUCT/latitude');
z1 = ncread(file1,'/PRODUCT/nitrogendioxide_tropospheric_column') ;

x2 = ncread(file2,'/PRODUCT/longitude');
y2 = ncread(file2,'/PRODUCT/latitude');
z2 = ncread(file2,'/PRODUCT/nitrogendioxide_tropospheric_column') ;
% Make my gird 
xx0 = min(min(x1(:)),min(x2(:)));
xx1 = max(max(x1(:)),max(x2(:)));

yy0 = min(min(y1(:)),min(y2(:)));
yy1 = max(max(y1(:)),max(y2(:)));
% DEfine your resolutions needed 
dx = 0.5 ; dy = 0.5 ;
[X,Y] = meshgrid(xx0:dx:xx1,yy0:dy:yy1) ;

F1 = scatteredInterpolant(x1(:),y1(:),z1(:),'nearest','none') ;
Z1 = F1(X,Y) ; 

F2 = scatteredInterpolant(x2(:),y2(:),z2(:),'nearest','none') ;
Z2 = F2(X,Y) ; 
Z = (Z1+Z2)/2 ;
pcolor(X,Y,Z) 
shading interp 

[Sreeraj R]

thank you sir, but this can be only used to display the images.. however i need to make a separate .nc file with all these paramaetrs from both the files. how do i save that file?

[Sreeraj R]

and the images overlaps in some parts, how do i formulate a code to just consider one image and ignore the other in these overlapping areas?

[KSSV]

A coomonn grid is made and average of both the results are carried out. To write to nc use ncwrite.

[Sreeraj R]

thank you sir