I got around to parsing the FAA's parachute file. At first, the data elements looked good enough to do a proper circle in Google Earth. However, most jump zones have a null radius or no radius. Nevertheless, where there is a radius, it's listed in the area comments. There's a similar problem throughout the data -- elements are missing in many records.
Another mystery: Some areas are charted, some are in the A/FD, and some are listed in neither. (FAA's Airport/Facility Directory This link will expire.).
If you've ever wanted to see all the jump zones in the US in Google Earth, the file is in the archive. Hint: It's called dropzones in the kml directory.
Another mystery: Why I can't get the lat/long math correct on multiple hemispheres the first time I try.
NOT FOR NAVIGATION
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