Just nearest neighbour I believe, so straight indexing based on the new
spacing. GDAL tools give more explicit options, as described here:

http://www.gdal.org/gdal_grid.html

On Saturday, May 26, 2012, Elena Couce wrote:

> Hello,
>
> I was wondering if anybody knew which method/algorithm readGDAL uses for
> interpolating a grid when the 'output.dim' parameter doesn't match
> 'region.dim' (ie, when the resolution requested doesn't match the one being
> read). readGDAL's documentation only says this uses "GDAL's method to take
> care of image decimation / replication".
>
> Many thanks,
> Elena
>
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