This directory and its sub-directories contain all the IDL code used to
generate the images of this project.  Below each file is briefly described.

plotting_routines.pro
  - contains most of the necessary routines needed to create the images.
    Since multiple plots were created, but with just different areas of the
    globe, it was more convient to make several procedures that each program
    could call.  Not all of the procedures needed are in this file.  Several
    others are in the "lidl" directory.

ytplot.pro
  - used to create a series of divergence strips y longitude coordinates long
    and x latitude coordinates wide over a specified amount of time and at a
    fixed point on the globe  Each plot is placed side by side so that the
    divergence at the given area can be better studied for patterns.

Within each sub-directory a number of different programs are used.  Starting
with the 3 oceans:

  Each directory contains common file names, except for the suffixes.
    atl = atlantic
    ind = indian
    pac = pacific
  The common files are:
    div2grid_monthly_XXX.pro
      - takes the div2grid monthly divergence values and plots only those in
        the specified ocean.  The latitude and longitude coordinates can be
        changed, as well as other variables.
    div2grid_weekly_XXX.pro
      - takes the div2grid weekly divergence values and plots only those in
        the specified ocean.  The latitude and longitude coordinates can be
        changed, as well as other variables.
    grid2div_monthly_XXX.pro
      - takes the grid2div monthly divergence values and plots only those in
        the specified ocean.  The latitude and longitude coordinates can be
        changed, as well as other variables.
    grid2div_weekly_XXX.pro
      - takes the grid2div weekly divergence values and plots only those in
        the specified ocean.  The latitude and longitude coordinates can be
        changed, as well as other variables.
    monthly_diff_XXX.pro
      - subtracts the div2grid monthly dataset from the grid2div monthly
        dataset and then plots each month.
    monthly_zonalavg_XXX.pro
      - averages the divergence along the latitudes of the given area, plots
        the result as a graph for both div2grid and grid2div datasets, then
        plots another graph showing the difference of the two methods.
    weekly_diff_XXX.pro
      - subtracts the div2grid weekly dataset from the grid2div weekly
        dataset and then plots each week. 
    weekly_zonalavg_XXX.pro
      - averages the divergence along the latitudes of the given area, plots
        the result as a graph for both div2grid and grid2div datasets, then
        plots another graph showing the difference of the two methods.

The global directory is similar to the separate oceans, but it doesn't
contain any zonal average plots and contains and a daily plot.
  daily_gridded.pro
    - plots each day in the daily_gridded dataset.
  daily_swaths.pro
    - plots each point in the original divergence dataset before anything is
      gridded or averaged over a day, week, or month.  This is the raw plot
      and traces out the path the satellite took for that entire day.  At
      points where the swath tracks overlap, it is the swath track that the
      satellite last created that is visible on the plot.
  div2grid_monthly.pro
    - takes the div2grid monthly divergence values and plots every point in
      the dataset.
  div2grid_weekly.pro
    - takes the div2grid weekly divergence values and plots every point in
      the dataset.
  grid2div_monthly.pro
    - takes the grid2div monthly divergence values and plots every point in
      the dataset.
  grid2div_weekly.pro
    - takes the grid2div weekly divergence values and plots every point in
      the dataset.
  monthly_diff.pro
    - subtracts the div2grid monthly datset from the grid2div monthly dataset
      and then plots each month over the globe.
  weekly_diff.pro
    - subtracts the div2grid weekly datset from the grid2div weekly dataset
      and then plots each week over the globe.