[R-sig-Geo] NetCDF: Unknown file format?

[Ziyu Ma]

Thank you Mike,

I see that there's probably no fast solution for this. And yes, there are
lots of data. I will learn to work with it in Linux then.

Cheers
Ma

Ziyu Ma
PhD Student
Ecoinformatics & Biodiversity,
Department of Bioscience, Aarhus University
Ny Munkegade 114, DK-8000 Aarhus C, Denmark


On Wed, Jul 29, 2015 at 2:27 PM, Michael Sumner <mdsumner at gmail.com> wrote:

>  Essentially this is probably that NetCDF4 (version 4 of the external
> library) is required, but that neither ncdf or RNetCDF have been built with
> that. The ncdf4 package is the only one that *requires* this, and CRAN
> supports NetCDF-3 for Windows via ncdf and RNETCDF and doesn't support
> ncdf4 for Windows.
>
> (There are many features in the NetCDF format, and there are many features
> not supported by any of these packages whether version 4 or not.)
>
> You can get a build of ncdf4 for Windows here:
>
> http://cirrus.ucsd.edu/~pierce/ncdf/
>
> but you're on your own in terms of what version of R that will work in, if
> at all, etc.
>
> You can  build one of the three packages yourself against NetCDF4 proper,
> and that is my preference - it's easiest on Linux, but it's not exactly
> "easy" if you are used to windows and the CRAN support for binary packages.
>
> If this is confusing that's just how it is - there are three R packages
> for NetCDF, none of them support everything in NetCDF and what works best
> depends on what you have available. If you have to do this a lot I
> recommend learning to work in Linux.
>
> Cheers, Mike.
>
> On Wed, 29 Jul 2015 at 21:45 Ziyu Ma <paul.ziyu.ma at gmail.com> wrote:
>
>> Dear all,
>>
>> I tried to use R to open NetCDF file from the ESA's  soil moisture
>> database:
>> http://www.esa-soilmoisture-cci.org/node/145
>>
>> I have tried to use the R packages "ncdf" or "RNetCDF", but whenever I
>> tried to open the file, I have this same error message:
>>
>> "Error in R_nc_open: NetCDF: Unknown file format"
>>
>> I'm confused since I think both packages where designed to handle this
>> file
>> format. Is there some other dependent softwares/packages missing on my
>> computer? I'm running Windows 7 64 bit and R 3.2.0 64 bit.
>>
>> The soil moisture database recommends the "ncdf4" package, but the Windows
>> version of it is no longer available.
>>
>> Thank you very much.
>>
>> Cheers,
>> Ma
>>
>> Ziyu Ma
>> PhD Student
>> Ecoinformatics & Biodiversity,
>> Department of Bioscience, Aarhus University
>> Ny Munkegade 114, DK-8000 Aarhus C, Denmark
>>
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>>
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