[R-sig-Geo] SpatialGridDataFrame to netcdf grid

[Edzer J. Pebesma]

Sebastian P. Luque wrote:
> On Mon, 12 Nov 2007 23:29:59 +0100 (CET),
> Roger Bivand <Roger.Bivand at nhh.no> wrote:
>
> [...]
>
>   
>> Then the fallback is to write a GTiff, and use gdal_translate to convert
>> it (one of the gdal utilities that build with the GDAL shared
>> object). If the same problem occurs, you may need to install netCDF and
>> GDAL from source. If that doesn't resolve it, then you'll need to
>> reshape the data to the required format and use functions in the ncdf
>> package to create and write to the file.
>>     
>
> I found out that the Debian packages with the gdal_translate binary is
> gdal-bin, and trying to writeGDAL() to GTiff and then gdal_translate as
> suggested earlier gives the same error message about cdfid not being
> valid.
>
> Just so I understand how the SpatialGridDataFrame object is structured:
>
> R> gridparameters(locs.sub.ts)
>   cellcentre.offset cellsize cells.dim
> 1            -69.12  0.06109       113
> 2             63.64  0.03424       122
> R> bbox(locs.sub.ts)
>              min    max
> coords.x1 -69.15 -62.25
> coords.x2  63.62  67.80
>
> How are the data (e.g. z values) aligned with respect to these values?  I
> would like to know what as.data.frame(locs.sub.ts) returns: the
> coordinates and data for the midpoint of the cell, or the data for some
> other reference point in the cell.  Thanks again for any help.
>   
The midpoint.
--
Edzer