getting data from an nc file

HDF Viewer<https://www.hdfgroup.org/downloads/hdfview/> can be a good way to look at the structure of nc files to see where different information is stored in the file.
Hello

I am trying to get rainfall data from the UK chess-met site

https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcatalogue.ceh.ac.uk%2Fdatastore%2Feidchub%2F2ab15bf0-ad08-415c-ba64-831168be7293%2Fprecip%2F&amp;data=05%7C01%7Cailich%40usf.edu%7C39cfc2a140934dc323d408dac240b9c0%7C741bf7dee2e546df8d6782607df9deaa%7C0%7C0%7C638060296454914830%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=AJ5Q%2BWYYGxbXJZjHxisFdGAAomjtIWn95k5r9vtXniw%3D&amp;reserved=0

and here there are a large number of nc files eg

"chess-met_precip_gb_1km_daily_20150101-20150131.nc"

I?ve found various sources on the net for opening nc files, and getting the
data but when I try instructions like

nc_data<-nc_open("chess-met_precip_gb_1km_daily_20150101-20150131.nc")

lon <- ncvar_get(nc_data, "lon")

lon

the code works but all I get is a series of element numbers and no data:

[,1]     [,2]     [,3]     [,4]     [,5]     [,6]     [,7]     [,8]     [,9]
[,10]    [,11]    [,12]

          [,13]    [,14]    [,15]    [,16]    [,17]    [,18]    [,19]
[,20]    [,21]    [,22]    [,23]    [,24]

And similarly for latitude

But if I open the nc file as a raster I get a raster precipitation plot of
Great Britain, which rather suggests that the lat and long values are in
there somewhere

Can anyone help with getting the actual data sets out of an nc file?

Thanks Nick Wray

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Hey Alexander,

I can look into it for you but your links didn't work for me. One is broken
and the other leads to a page where logging is required. If you can share
an example file I would see if I can help.

HDF Viewer<https://www.hdfgroup.org/downloads/hdfview/> can be a good way
to look at the structure of nc files to see where different information is
stored in the file.
________________________________
From: R-sig-Geo <r-sig-geo-bounces at r-project.org> on behalf of Nick Wray <
nickmwray at gmail.com>
Sent: Wednesday, November 9, 2022 5:53 AM
To: r-sig-geo at r-project.org <r-sig-geo at r-project.org>
Subject: [R-sig-Geo] getting data from an nc file

Hello

I am trying to get rainfall data from the UK chess-met site

https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcatalogue.ceh.ac.uk%2Fdatastore%2Feidchub%2F2ab15bf0-ad08-415c-ba64-831168be7293%2Fprecip%2F&amp;data=05%7C01%7Cailich%40usf.edu%7C39cfc2a140934dc323d408dac240b9c0%7C741bf7dee2e546df8d6782607df9deaa%7C0%7C0%7C638060296454914830%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=AJ5Q%2BWYYGxbXJZjHxisFdGAAomjtIWn95k5r9vtXniw%3D&amp;reserved=0

and here there are a large number of nc files eg

"chess-met_precip_gb_1km_daily_20150101-20150131.nc"

I?ve found various sources on the net for opening nc files, and getting the
data but when I try instructions like

nc_data<-nc_open("chess-met_precip_gb_1km_daily_20150101-20150131.nc")

lon <- ncvar_get(nc_data, "lon")

lon

the code works but all I get is a series of element numbers and no data:

[,1]     [,2]     [,3]     [,4]     [,5]     [,6]     [,7]     [,8]
 [,9]
[,10]    [,11]    [,12]

          [,13]    [,14]    [,15]    [,16]    [,17]    [,18]    [,19]
[,20]    [,21]    [,22]    [,23]    [,24]

And similarly for latitude

But if I open the nc file as a raster I get a raster precipitation plot of
Great Britain, which rather suggests that the lat and long values are in
there somewhere

Can anyone help with getting the actual data sets out of an nc file?

Thanks Nick Wray

        [[alternative HTML version deleted]]

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R-sig-Geo mailing list
R-sig-Geo at r-project.org

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the sender and know the content is safe.

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