How to convert netcdf to tiff

Question

nuwanthi arampola 2019-7-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/471747-how-to-convert-netcdf-to-tiff

评论： nuwanthi arampola 2019-7-16

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?

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Guillaume 2019-7-15

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 2019-7-15

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"

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Answer 1

KSSV 2019-7-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/471747-how-to-convert-netcdf-to-tiff#answer_383241

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

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KSSV 2019-7-15

编辑：KSSV 2019-7-15

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 2019-7-15

编辑：Guillaume 2019-7-15

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.

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Answer 2

nuwanthi arampola 2019-7-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/471747-how-to-convert-netcdf-to-tiff#answer_383339

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