[R-sig-Geo] raster pkg: overwriting the dimensions detected by netcdf4 (PERSIANN-CDR)

[Michael Sumner]

On Thu, 4 Feb 2016 at 01:26 MAURICIO ZAMBRANO BIGIARINI <
mauricio.zambrano at ufrontera.cl> wrote:

> Dear spatial community,
>
> While reading some netCDFfiles with the raster package , I got a
> "rotated" file, where the columns where read as rows and vice versa:
>
> ------------- START ----------------
> x <- raster("PERSIANN-CDR_v01r01_20090101_c20140523.nc")
> Loading required namespace: ncdf4
> plot(x)
> x
> class       : RasterLayer
> dimensions  : 1440, 480, 691200  (nrow, ncol, ncell)
> resolution  : 0.25, 0.25  (x, y)
> extent      : -60, 60, 0, 360  (xmin, xmax, ymin, ymax)
> coord. ref. : NA
> data source : /home/hzambran/PERSIANN-CDR_v01r01_20090101_c20140523.nc
> names       : NOAA.Climate.Data.Record.of.PERSIANN.CDR.daily.precipitation
> z-value     : 2009-01-01
> zvar        : precipitation
> ------------- END ----------------
>
>
Transpose might be sufficient?

tx <- t(x)

plot(tx)
tx

HTH


The previous summary shows that the spatial extent of the file is
> 60W-60E and 0-360N, while the correct extent should be: 60S, 60N, 0E,
> 360E.
>
> The file can be downloaded from:
>
> ftp://data.ncdc.noaa.gov/cdr/persiann/files/2009/PERSIANN-CDR_v01r01_20090101_c20140523.nc
>
>
> After contacting the providers of the file, they mentioned that when
> reading the file I have to provide the dimension information, i.e.,
> 480 rows and 1440 columns, while the raster package detects the other
> way around.
>
> I would highly appreciate if you could tell me:
>
> 1) is the previous situation a bug of my netCDF driver (netCDF 4.1.3,
> GDAL 1.11.2, released 2015/02/10) or a problem of the dimensions
> actually recorded in the netCDF file ?
>
> 2) is there any way to  overwrite the dimensions detected by netcdf4
> when reading the file with the 'raster' command ?
>
>
> My sessionInfo():
> R version 3.2.3 (2015-12-10)
> Platform: x86_64-pc-linux-gnu (64-bit)
> Running under: Ubuntu 14.04.2 LTS
>
> locale:
>  [1] LC_CTYPE=en_GB.UTF-8       LC_NUMERIC=C
>  [3] LC_TIME=en_GB.UTF-8        LC_COLLATE=en_GB.UTF-8
>  [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_GB.UTF-8
>  [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
>  [9] LC_ADDRESS=C               LC_TELEPHONE=C
> [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
> other attached packages:
> [1] raster_2.5-2 sp_1.2-1
>
> loaded via a namespace (and not attached):
> [1] tools_3.2.3     Rcpp_0.12.3     ncdf4_1.15      grid_3.2.3
> [5] lattice_0.20-33
>
>
> Thanks in advance and kind regards
>
> Mauricio Zambrano-Bigiarini, PhD
>
> =====================================
> Dept. of Civil Engineering
> Faculty of Engineering and Sciences
> Universidad de La Frontera
> PO Box 54-D, Temuco, Chile
> http://ingenieriacivil.ufro.cl/
> =====================================
> mailto     : mauricio.zambrano at ufrontera.cl
> work-phone : +56 45 259 2812
> =====================================
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>  It's the life in your years". (Abraham Lincoln)
> =====================================
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>
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-- 
Dr. Michael Sumner
Software and Database Engineer
Australian Antarctic Division
203 Channel Highway
Kingston Tasmania 7050 Australia

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