[R-sig-Geo] rgdal - problem with reading grib files

[bart]

  Hi

  This seems to relate to the cell center cell corner error that has been
  recently fixed in libgdal ( see release notes of libgdal 1.9 ). Did you
  update to the most recent version of libgdal?

  Bart
>
> On 01/25/2012 12:37 AM, Santiago Beguería Portugués wrote:
>> Hi,
>>
>> I am stuck when trying to read data from certain grib files with GDAL.
>> When I try to read the data I get the following error:
>>
>>> tmp<- readGDAL('./data/ghcn_cams/ghcn_cams_1948_cur.grb')
>> ...
>> Error in `proj4string<-`(`*tmp*`, value =<S4 object of class "CRS">) :
>> Geographical CRS given to non-conformant data
>>
>> I read on this mail list that this might be caused by data being
>> outside the valid range for the CRS. And so it seems:
>>
>>> GDALinfo('./data/ghcn_cams/ghcn_cams_1948_cur.grb')
>> rows 360
>> columns 720
>> bands 768
>> origin.x 0.25
>> origin.y -90.25
>> res.x 0.5
>> res.y 0.5
>> ysign -1
>> oblique.x 0
>> oblique.y 0
>> driver GRIB
>> projection +proj=longlat +a=6371200 +b=6371200 +no_defs
>> file ./data/ghcn_cams/ghcn_cams_1948_cur.grb
>>
>> Since the origin.y coordinate is -90.25. However, according to the
>> metadata provided in an accompanying file the lowest y coordinate
>> should be -89.75:
>>
>> dset ^ghcn_cams_1948_cur.grb
>> index ^ghcn_cams_1948_cur.grb.idx
>> undef 9.999E+20
>> title ghcn_cams_1948_cur.grb
>> * produced by grib2ctl v0.9.12.5p39a
>> dtype grib 255
>> options yrev
>> ydef 360 linear -89.750000 0.5
>> xdef 720 linear 0.250000 0.500000
>> tdef 768 linear jan1948 1mo
>> zdef 1 linear 1 1
>> vars 1
>> TMP2m 0 11,105,2 ** 2 m above ground Temp. [K]
>> ENDVARS
>>
>> I need to find a workaround to solve this problem, but I'm new to grib
>> files (mostly used netCDF before) and I don't know how to proceed.
>> Would appreciate any help.
>>
>> Thank you in advance,
>>
>>
>> Santiago Beguería
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>