[R-sig-Geo] Error in netCDF file: cells are not equally spaced

[Frederico Faleiro]

Dear list,

I am using some  netCDF files from the CMIP5 climate models in raster
package, but I am having some issues with one model.
The netCDF file from the GFDL-ESM2G model (e.g.
http://aims3.llnl.gov/thredds/fileServer/css03_data/cmip5/output1/NOAA-GFDL/GFDL-ESM2G/rcp45/mon/atmos/Amon/r1i1p1/v20120412/pr/pr_Amon_GFDL-ESM2G_rcp45_r1i1p1_204101-204512.nc
)
have the error message as in bellow example.

#Example
library(raster)
s1 <- stack("pr_Amon_GFDL-ESM2G_rcp45_r1i1p1_204101-204512.nc")
Error in .rasterObjectFromCDF(x, type = objecttype, band = band, ...) :
  cells are not equally spaced; you should extract values as points

# I check some solutions that recomend force read the file with the
argument "stopIfNotEqualSpaced = F" as bellow.
sf <- stack("pr_Amon_GFDL-ESM2G_rcp45_r1i1p1_204101-204512.nc",
*stopIfNotEqualSpaced
= F*)
bf <- brick("pr_Amon_GFDL-ESM2G_rcp45_r1i1p1_204101-204512.nc",
*stopIfNotEqualSpaced
= F*)

I performed some tests and only "works" with brick. However I did not find
any solution to check where is the problem and fix it in the file.

How can I check if it is really an issue and fix it?

sessionInfo()
R version 3.5.1 (2018-07-02)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 18362)

Matrix products: default

locale:
[1] LC_COLLATE=Portuguese_Brazil.1252  LC_CTYPE=Portuguese_Brazil.1252
[3] LC_MONETARY=Portuguese_Brazil.1252 LC_NUMERIC=C
[5] LC_TIME=Portuguese_Brazil.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] raster_2.8-19 sp_1.3-1

loaded via a namespace (and not attached):
[1] compiler_3.5.1   rgdal_1.4-3      Rcpp_1.0.1       codetools_0.2-15
ncdf4_1.16.1
[6] grid_3.5.1       lattice_0.20-35

Best regards,

Frederico

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