This program allows both great-circle (polar) and
rectangular projections of the world. The great-circle map
is centered on any specified latitude and longitude (the
"home" location). The rectangular projection is shown with
the home longitude in the middle of the screen.
The extensive database of cities and countries was
upgraded by Vince Grgic, S52CC, and thanks are extended to
him for his considerable effort! If you have modified that
database yourself, be sure to archive it and add your
changes to Vince's version. Better yet, tell either of us
about any changes so they may be incorporated into the
Current version of Pizza is 2.13; size is 2.7
- The home location can be specified by either a
direct entry into a textbox or by using a pulldown list
of over 3200 sites around the world.
- Similarly, a target location can be specified
directly, by using another pulldown list or by entry of
the Maidenhead grid data into a textbox.
- The home and/or target locations may also be
entered by selecting the rectangular projection and
left-clicking on a location to instantly specify a home
location, or right-clicking on a location to instantly
specify a new target location.
- The target location may be entered on either the
polar or rectangular projection by clicking on List
Calls and then selecting a prefix.
- The current sun location along with the terminator
are (optionally) shown on both projections. An Offset
input allows correction for daylight savings or
half-hour time zone correction.
- The path from the home location to the target
location is shown on both the polar plot and the
- Text data files for an antenna pattern can be
overlaid onto both the polar and the rectangular plots;
pattern size is adjustable. "Rings" showing gain
referred to the azimuth of maximum transmission and 3,
6 and 12 dB below that point can be toggled on and
- The size of the plot in terms of kilometers can be
stepped by pressing the "Closer" or "Farther"
- A compass with lines at 10 degree intervals can be
overlaid on the display. This can be toggled on and off
using the "Compass" button.
- A set of rings showing distance in 1000 km
intervals can be overlaid on the display. This too can
be toggled, by using the "Distance" button.
- The resolution of the on-screen plots can be
adjusted over a wide range. This allows quick screen
update even on a slow computer, or higher-quality
presentations at the expense of an increase in plotting
time. The output from the printer is always at the
- The output to the printer is from a separate
routine which closely duplicates the output as seen on
the screen, but of course without pixelation. To send a
plot (polar or rectangular) to the default printer just
press the "Print" button.
- If the home location is within the contiguous
United States, and if the size is set so that the map
covers mostly those states, then the map shows the
state boundaries as well.
- On exiting the program the current parameters are
stored for an easy restart.
- The plotting routines really need a fast computer.
Using a fast computer allows good screen resolution
within a reasonable time frame. Slow computers take
longer to re-plot the screen for a given resolution.
Plotting resolution is adjustable over a wide