How do I append new data to a new variable in a NETCDF file ?

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俊 马
俊 马 2023-2-21
评论： 俊 马 2023-2-28
I want to append new data to a new variable in the existing netcdf file and let other variables remain unchanged. However, when I use:
ncid=netcdf.open('E:\data\Landcover\MCD12Q1\heihe\surfdata_40x40_hh_gravtest.nc','WRITE');
gravid = netcdf.defVar(ncid,'PCT_GRAVEL','double',[40 40 10]);
error shows:
Operation not allowed in data mode (NC_ENOTINDEFINE)
do you know how to solve it ? thanks
  1 个评论
dpb
dpb 2023-2-21
I "know (almost) nuthink!" per Sgt Schultz about NetCDF files, but the MATLAB interface supplies a higher-level abstracted function <nccreate> that purports to be able to do that. I'd suggest trying it.
If that fails, you'll have to dig a whole lot deeper into the file content of the file you have and the details of the required syntax/operations to add to it.
I dunno if .defVar is the first thing you can call or if you have to do more preliminary work first; it's a pretty complex format/system...

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Raghunathraju
Raghunathraju 2023-2-27
Hi,
As per my understanding, you want to append new data to a new variable in a NETCDF file.
You have used the following code to get your work done.
ncid=netcdf.open('E:\data\Landcover\MCD12Q1\heihe\surfdata_40x40_hh_gravtest.nc','WRITE');
gravid = netcdf.defVar(ncid,'PCT_GRAVEL','double',[40 40 10]);
But the datatype you used in “netcdf.defVar” is double which is invalid for NETCDF .Instead you can use “NC_DOUBLE”.
For further reference you can go through the link below
https://www.mathworks.com/help/matlab/ref/netcdf.defvar.html?s_tid=doc_ta

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