JamesNot entirely Fly! related, more general scenery stuff.
Did a bit of digging into Digital Elevation Maps. 30 arc seconds is about 1km so you're only sampling the elevation every 1km. Something as small as Ayers Rock doesn't show because the resolution isn't high enough.
There are some much higher resolution maps available but the Australian government likes to charge for them unlike the USGS.
Hopefully, when the latest Shuttle radar map data is processed and available then we'll have accurate, high res maps for most of the world. Late 2004 is the target date for this I believe.
Andrew Luck
18 SW EGSH