function temperature_scatter ( )

%*****************************************************************************80
%
%% temperature_scatter draws a scatter plot of temperature reading locations.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    17 July 2018
%
%  Author:
%
%    John Burkardt
%
  fprintf ( 1, '\n' );
  fprintf ( 1, 'temperature_scatter:\n' );
  fprintf ( 1, '  MATLAB version\n' );
  fprintf ( 1, '  Make a scatter plot of temperature reading locations.\n' );
%
%  This datafile includes temperature, -longitude, latitude
%
  tll = load ( 'temperature_data.txt' );
%
%  Plot the data.
%
  plot ( tll(:,2), tll(:,3), 'b.', 'MarkerSize', 25 );
  grid on
  xlabel ( '<--- -Longitude --->', 'Fontsize', 16 );
  ylabel ( '<--- Latitude --->', 'Fontsize', 16 );
  title ( 'Location of January Temperature Readings', 'Fontsize', 16 );
  filename = 'temperature_scatter.png';
  print ( '-dpng', filename );
  fprintf ( 1, '\n' );
  fprintf ( 1, '  Graphics saved as "%s"\n', filename );
%
%  Terminate.
%
  fprintf ( 1, '\n' );
  fprintf ( 1, 'temperature_scatter:\n' );
  fprintf ( 1, '  Normal end of execution.\n' );

  return
end

