code: def proj_units_to_meters(proj_str):
      
      proj_parts = proj_str.split()
      new_parts = []
      for itm in proj_parts:
          key, val = itm.split('=')
          key = key.strip('+')
          if key in ['a', 'b', 'h']:
              val = float(val)
              if val < 6e6:
                  val *= 1000.
                  val = '%.3f' % val
  
          if key == 'units' and val == 'km':
              continue
  
          new_parts.append('+%s=%s' % (key, val))
  
      return ' '.join(new_parts)
docs: Convert projection units from kilometers to meters.