How to convert netcdf to tiff

I'm working with netcdf file in Ocean Color website.

I want to know How to convert them in to tiff uding matlab coding.

Could you please any one help me in this matter?

[Guillaume]

NetCDF is a generic format for storing any sort of data. On the other hand, TIFF is a format for storing images only. So you'll have to clarify what you mean by converting netcdf to tiff.

[nuwanthi arampola]

Yes exactly,

I want to get the cholorophill_ a data wich is containing in this netcdf file that are available in this following link "https://oceancolor.gsfc.nasa.gov/cgi/browse.pl?sen=am"

Answer 1

[KSSV]

Refer this for the same question: https://in.mathworks.com/matlabcentral/answers/353583-netcdf-into-geotiff-tiff-file-conversion

[nuwanthi arampola]

Thank you very much,

I reffered them before and tried to implement in my case,

But it does not make any sense it popup an error message for me as bellow screenshot

[KSSV]

No where error popped is shown........there is some suggestion/ warning under for. Did you try running the code? What error you are getting.

[nuwanthi arampola]

Yes of course.There is an error.please see bellow,

[KSSV]

YOu have to read about the functions which are given in the code......simply copy pasting will not work. The error clearly says, there is no variable named latitude in the nc file. You have to use ncdisp and see on what variable is latitude named int he ncfile.

Don't attach code as a image snippet......copy paste it and copy the error which throws up here.

[Guillaume]

Please, don't post screenshots of code, paste it as text (and format it with the button). We can't copy/paste screenshots into matlab for testing.

As I said, netcdf is a generic container for scientific data. Within that container you've got all sorts of variables whose name is decided by whoever creates the file. In order to read a netcdf file you need to use the same variable names that are stored in the file. As per KSSV link, you can get these names with ncdisp, ncinfo, etc.

As the error tells you, there is no latitude variable in your netcdf file. You'll have to find out for yourself what's in your file and adapt KSSV code accordingly, but the idea is there, use ncread to read whatever is in the file, and geotiffwrite to write whatever image is there as a tiff file.

I couldn't figure out how to download a file from the link you posted. You could also attach an example file.

Answer 2

[nuwanthi arampola]

OutFolder = 'D:\paper\practice2';
cd D:\paper\data\January
dinfo = dir('*.nc');
nfile = length(dinfo); 
filenames = {dinfo.name}; 
for k = 1:nfile 
    file_name{k} = filenames{k};
lat = ncread(file_name{i},'latitude') ;
lon = ncread(file_name{i},'longititude') ; 
A{k} = ncread(file_name{k},'ch1');
A{k} = (double(A{k}));
R = georasterref('RasterSize',size(A{k}),'LatitudeLimits',[min(lat),max(lat)],'LongitudeLimits',[min(lon),max(lon)]);
tiffile{k} = strcat(filenames{k},'.tif') ;
geotiffwrite(fullfile(OutFolder,tiffile{k}),A{k},R);
end

[Guillaume]

Since you have accepted your own answer (why?) we'll assume that your problem is resolved, although it's unclear why this code works when you previously told us it didn't. You've made no substantial changes to the code (if anything you've complicated it for no reason) so if 'latitude' wasn't a variable in your netcdf file, it still isn't.

Note that the:

file_name{k} = filenames{k};

is completely pointless. You also don't need brackets around the double(A{k}).

Oh, and I've just noticed that your code doesn't work since it uses the undefined i instead of k on some lines.

[nuwanthi arampola]

Im sorry ,I had accepted my own answer by mistake.

I adjust i instead of k but it does not make any sense to me.

[Guillaume]

So:

Is your problem solved or not?

If not, what is the problem currently? Have you found which variables are in your file and which one of them you want to save as a tiff file?

[nuwanthi arampola]

No i did not solved it yet.

I'm stcuked with empty mind.