code: def obtain_to(filename):
      
      root, _ = nc.open(filename)
      lat, lon = nc.getvar(root, 'lat')[0,:], nc.getvar(root, 'lon')[0,:]
      nc.close(root)
      return obtain(lat, lon)
docs: Return the digital elevation map projected to the lat lon matrix coordenates.
  
      Keyword arguments:
      filename -- the name of a netcdf file.