Boltek NexStorm Lite - Manual (Page 36)

Lightning Detection Software, Version 1.0
TYPE DIFFERENTIATED STRIKE RATE GRAPH
The NexStorm strike rate graph can be configured to display historical strike rate data in several different
ways. The graph is type differentiated, which means that the different strike types can be represented using
separate graph plots, and persistent which means that the graph data is saved to disk and will persist through
software restart.
Time scale
The graph can be configured to display different time intervals, ranging from 0-15 minutes and up to 0-120
minutes. The graph granularity (time resolution and display refresh rate) is 20 seconds.
To change the time scale, press F1 to increase or F2 to decrease.
Strike rate scale
The scale which indicates the strike rate is scaled automatically. The lowest possible range on the vertical
axis is 0-30 strikes per minute. The upper bound is infinite.
Graph smoothing
The different graphs can all be smoothed by applying a Laplace 5-pass smoothing algorithm. The difference
between a smoothed and non-smoothed graph is illustrated in fig.13 where identical graph data is shown with
and without smoothing applied. A side by side comparison of an equivalent stacked graph is shown in fig.16.
As is evident in fig.13, graph peaks will be smoothed out so that the peak strike rate shown in the graph will in
most cases be lower than indicated by the numerical peak strike rate indicator. Smoothing is used to improve
the visualization of strike rate data but will on the other hand make the graph less accurate. If accuracy is
important then using smoothing should be avoided.
To toggle graph smoothing, press the F3 key or select the corresponding option from the Trend graph menu
or the Data graphics configuration dialog.
Edition: 5/L1
2007-09-02
© 2007 Astrogenic Systems Table of Contents Page 36
Figure 13: Non-smoothed (black) and smoothed (red) graph comparison