function temperature_scatter ( )

%*****************************************************************************80
%
%% TEMPERATURE_SCATTER draws a scatter plot temperature reading locations.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    19 July 2018
%
%  Author:
%
%    John Burkardt
%
  timestamp ( );
  fprintf ( 1, '\n' );
  fprintf ( 1, 'TEMPERATURE_SCATTER:\n' );
  fprintf ( 1, '  MATLAB/Octave version %s:\n', version ( ) );
  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 --->' );
  ylabel ( '<--- Latitude --->' );
  title ( 'Location of January Temperature Readings' );

  pause ( 5 )
%
%  Save the plot as a PNG file.
%
  filename = 'temperature_scatter.png';
  print ( '-dpng', filename );
  fprintf ( 1, '\n' );
  fprintf ( 1, '  Graphic data saved in "%s"\n', filename );
%
%  Terminate.
%
  fprintf ( 1, '\n' );
  fprintf ( 1, 'TEMPERATURE_SCATTER:\n' );
  fprintf ( 1, '  Normal end of execution.\n' );
  timestamp ( );

  return
end

