I have a nc file with 145 long, 129 lat and 10227 time values, I want to change this daily data (10,227) to monthly values. What could be easy way?

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Neha Kanda
Neha Kanda 2018-2-23
评论： John BG 2018-2-24
Actually, this is a climate data and I need monthly values from which I shall create seasons and plot in map form.

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John BG
John BG 2018-2-24
Hi Neha Kanda
this is John BG <mailto:jgb2012@sky.com jgb2012@sky.com>
1.
why more longitudes than latitudes: are there missing latitudes, or same longitude repeats along diverse longitudes?
2.
Same for time stamps, please confirm that you have many void time stamps, without coordinates I mean.
3.
Any chance for you to attach a sample of the data described in your question?
appreciating time and attention, awaiting answer
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Neha Kanda
Neha Kanda 2018-2-24
Actually, I am working on climate data of indian subregion. Data is available in Netcdf format. Its temporal resolution is daily. So for 28 years, I have daily data which is almost 10227 days. I wish to convert this daily data into monthly/ seasonal data within that netcdf format. After that I would like to compare the results of this model with other models spatially, for that I need to convert netcdf to image/raster format.
John BG
John BG 2018-2-24
so far, without a sample of the data to process, I have the impression that your question gets solved by translating the netcdf file to a MATLAB structure.
Once the data in a MATLAB structure, it's straight forward to get the data you want.
Please have a look at Lazerson's function read_netcdf
https://www.mathworks.com/matlabcentral/fileexchange/28556-read-netcdf?s_tid=srchtitle
If you attach a sample of the data to your question I will use that function or other available in the MAthworks file exchange related to NetCDF to then obtain MATLAB format data to work with.
Regards
John BG
<mailto:jgb2012@sky.com jgb2012@sky.com>

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更多回答（2 个）

KSSV
KSSV 2018-2-23
You should be having dates in your hand.......read the dates....pick the months and calculate the mean of monthly data.
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Neha Kanda
Neha Kanda 2018-2-24
Actually, I am working on climate data of indian subregion. Data is available in Netcdf format. Its temporal resolution is daily. So for 28 years, I have daily data which is almost 10227 days. I wish to convert this daily data into monthly/ seasonal data within that netcdf format. After that I would like to compare the results of this model with other models spatially, for that I need to convert netcdf to image/raster format.
KSSV
KSSV 2018-2-24
It is not a deal..it can be done...you need to get indices of months you want and run mean on the roster...the output would be a raster itself...it can be then written to NC file..

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Peter Perkins
Peter Perkins 2018-2-23
This seems like it could be easily solved using retime on a timetable, but there's not enough information in you post to go on.
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Neha Kanda
Neha Kanda 2018-2-24
Thanks Peter But since I am new to MATLAB, could you pls tell more about this retime option. Actually, I am working on climate data of indian subregion. Data is available in Netcdf format. Its temporal resolution is daily. So for 28 years, I have daily data which is almost 10227 days. I wish to convert tjis daily data into monthly/ seasonal data within that netcdf format. After that I would like to compare the results of this model with other models spatially, for that I need to convert netcdf to image/raster format.

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