Error loading UERRA data

[dinilu]

Hi!
I found another error when trying to load data from the UERRA dataset (https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-uerra-europe-single-levels?tab=overview) with the loadGridData function.

> uerra <- "../Data/UERRA/download.nc"
> di.uerra <- dataInventory(uerra)
[2020-09-10 13:35:48] Doing inventory ...
[2020-09-10 13:35:48] Retrieving info for 't2m' (0 vars remaining)
[2020-09-10 13:35:48] Done.
> str(di.uerra)
List of 1
 $ t2m:List of 4
  ..$ Description: chr "2 metre temperature"
  ..$ DataType   : chr "float"
  ..$ Units      : chr "K"
  ..$ Dimensions :List of 3
  .. ..$ time:List of 4
  .. .. ..$ Type      : chr "Time"
  .. .. ..$ TimeStep  : chr "21600 seconds"
  .. .. ..$ Units     : chr "seconds since 1970-01-01"
  .. .. ..$ Date_range: chr "1961-01-01T00:00:00Z - 1961-12-31T18:00:00Z"
  .. ..$ lat :List of 3
  .. .. ..$ Type  : chr "Lat"
  .. .. ..$ Units : chr "degrees_north"
  .. .. ..$ Values: num [1:565] 17.6 17.7 17.8 17.9 17.9 ...
  .. ..$ lon :List of 3
  .. .. ..$ Type  : chr "Lon"
  .. .. ..$ Units : chr "degrees_east"
  .. .. ..$ Values: num [1:565] 300 300 300 300 300 ...
> hist.uerra <- loadGridData(uerra, var = "t2m")
[2020-09-10 13:37:01] Defining harmonization parameters for variable "tas"
[2020-09-10 13:37:01] Defining geo-location parameters
Error in .jcall("RJavaTools", "Ljava/lang/Object;", "invokeMethod", cl,  : 
  ucar.ma2.InvalidRangeException: last (-1) must be >= first (0)

I have tracked down inside the function to find the error in the function getLatLonDomain:

> latLon <- getLatLonDomain(grid, lonLim, latLim)
[2020-09-10 13:45:14] Defining geo-location parameters
Error in .jcall("RJavaTools", "Ljava/lang/Object;", "invokeMethod", cl,  : 
  ucar.ma2.InvalidRangeException: last (-1) must be >= first (0)

Looking into this function, I found the error arise at the following line:

> llRanges[[2]] <- gcs$getRangesFromLatLonRect(.jnew("ucar/unidata/geoloc/LatLonRect", spec2))
Error in .jcall("RJavaTools", "Ljava/lang/Object;", "invokeMethod", cl,  : 
  ucar.ma2.InvalidRangeException: last (-1) must be >= first (0)

I suspect the error is caused on how the dataset store longitude coordinates (dataset is Lambert Conformal Conic projection), and longitud coordinates goes from 299.596 to 394.3205

> min(di.uerra$t2m$Dimensions$lon$Values)
[1] 299.596
> max(di.uerra$t2m$Dimensions$lon$Values)
[1] 394.3205

Any work around to this problem?
Please, let me know if I can help somehow to debug the issue.
Best and thank you for the awesome framework.

[durutti]

you can use nco tools before using loadeR
to conevrt from 0-360 to -180-180
ncap2 -O -s 'where(lon > 180) lon=lon-360' in.nc out.nc

[dinilu]

Thanks for the hint!