Click here to see the SAS code.
Click here to see the example.

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This is the no-nonsense/technical plot of some data collected by 
a High Altitide Balloon.

The first plot shows the altitude of the balloon, and the 
second plot shows the temperature and humidity measured 
during the journey.

The biggest "tricks" I used here were things to line the plots
up so that they correspond with each other (up/down) at the 
same times (so the temperatures and humidity line up with the
corresponding elevation).

First, I had to manipulate the spacing on the left & right
of the bottom graph (by adding blank titles on the left and
right) so that the left & right axes line up with the left
and right axes of the graph above it.

Then I find the data point for the maximum altitude, and
save that info in a macro variable, so I can use it to annotate
a dark black line at the maximum altitude - data to the left
of this line is during the ascent, and data to the right is 
during the descent.

I also find the datapoints during the ascent and descent
that were nearest the 30k, 60k, and 90k feet altitude, and
annotate a line from the left & right altitude axes to the 
datapoint, and then annotate a line down to the time axis.
I then annotate a similar line in the 2nd graph, which lines
up with the lines in the first graph.  Now you can easily see
when the balloon crossed these "milestone" altitudes.

And, rather than having a color legend, I annotate colored 
text above the plots, corresponding to the colored lines in 
the plots: magenta=Altitude, Blue=Temperature, Purple=humidity
(sorry colorblind people!)


This data came from the good folks at ...  NearSpaceVentures 


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