3.3. How can I downsample the product?

The standard resolution for this product is 0.002° (about 200 m) and each track contains ~ 2–4 million pixels. If you want lower resolution (i.e. fewer pixels), you can use GMT to resample a grd file extracted from the HDF5 file with gmt grdsample:

$ gmt grdsample NAME.grd -RW/E/S/N -Ixinc/yinc -r -GOUTNAME.grd

You can also use a variety of methods within Python or Matlab if you have read the product in that way.