How to extract the data from .nc file based on longitude and latitude,time?

Question

alagu mathi 2014-5-17

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https://ww2.mathworks.cn/matlabcentral/answers/129975-how-to-extract-the-data-from-nc-file-based-on-longitude-and-latitude-time

编辑： Lee Key 2021-6-2

Hi, I have to extract the data from netcdf file based on lat,long and time. I have written the following code.

ncid = netcdf.open('\C:\Users\divecha21\Desktop\errorBar\tasmax_day_BNU-ESM_rcp85_r1i1p1_20060101-21001231.nc','NC_NOWRITE');
peaksData  = ncinfo('\C:\Users\divecha21\Desktop\errorBar\tasmax_day_BNU-ESM_rcp85_r1i1p1_20060101-21001231.nc','tasmax');
ncdisp('\C:\Users\divecha21\Desktop\errorBar\tasmax_day_BNU-ESM_rcp85_r1i1p1_20060101-21001231.nc','tasmax');
[ndim, nvar, natt, unlim] = netcdf.inq(ncid)
[dimname, dimlength] = netcdf.inqDim(ncid, 0)
[dimname, dimlength] = netcdf.inqDim(ncid, 1)
[dimname, dimlength] = netcdf.inqDim(ncid, 2)
lon = netcdf.getVar(ncid,0,0,128)
%time = netcdf.getVar(ncid,2,0,34675)
lat = netcdf.getVar(ncid,1,0,64)
 latlim = [5.25 36.75];
 lonlim = [60.25 97.25];
 precJanuary = netcdf.getVar(ncid,2,[60.25 5.25 1],[97.25 36.75 1]);

Actually I have global temperature data i have to extract only india. After execution,I got the following error.

>> sample1

Error using ncread Expected start to be integer-valued.

Error in internal.matlab.imagesci.nc/read (line 557) validateattributes(start,{'numeric'},...

Error in ncread (line 58) vardata = ncObj.read(varName, varargin{:});

Error in sample1 (line 27) precJanuary = ncread('\C:\Users\divecha21\Desktop\errorBar\tasmax_day_GFDL-ESM2M_rcp85_r1i1p1_20060101-20101231.nc','tasmax',[60.25 5.25 1],[97.25 36.75 1]);

Can any one help me to clear this? I am new to matlab.

Thank you

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alagu mathi 2014-5-20

Yes,I tried ncinfo() but still i could n't clear that problem.

Mohnish sinha 2014-11-10

will you please write the revised code for extracting nc files, I am looking for the data for India...

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Answer 1

Ashish Uthama 2014-5-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/129975-how-to-extract-the-data-from-nc-file-based-on-longitude-and-latitude-time#answer_137568

编辑：Ashish Uthama 2014-5-20

在 MATLAB Online 中打开

The nc* functions and the netcdf.* functions represent two independent ways to access a NetCDF file. I would recommend sticking to nc* functions until you get comfortable enough to directly access the NetCDF library interface using the netcdf.* functions (it uses C style indexing and dimension ordering which is different from what nc* functions report and use).

Instead of

precJanuary = netcdf.getVar(ncid,2,[0 0 0],[128 64 1]);

try

precJanuary = ncread(filename, varname,[1 1 1],[128 64 1]);