Given a raster, how do I produce a raster of the N times coarser
resolution (and with the same extent), such as:
* the values of the target raster's pixels are the mean values
of the corresponding source raster's ones;
* the same, but with the minimum being the value;
* the same, but with the maximum being the value?
Could all of the aforementioned rasters be produced ``in a
single step''?
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