Re: NASA Worldwind, & Large scale features in Africa

What, have all the real geo types run off and left this place
to the autopost news releases, crossposts, and whackos?

on 7 May 2005 04:19:00 GMT, pete <vincent@xxxxxxxxxxxxxxx> sez:

` Hi folks, 'been a while since I've passed by these parts, much
` going on in life to keep me from idle hours at the usenet trough.

` I have recently been introduced to NASA WorldWind earth viewer.
` I highly, highly recommend it. It does for the world what the
` google maps satellite view offers for the US, plus more - you
` can drop your viewpoint to ground level and radar topology data
` automagically kicks in to show the terrain in relief. For a
` large-scale geology fan, this thing is just hours and hours and
` hours of fun. Ultimate resolution over the globe except the high
` polar regions appears to be in the order of 20 metres.

` It is found at a site that runs something like worldwind.nasa.gov,
` or something very similar. Warning: it is quite resource intensive.
` It runs from a free downloadable viewer, which installs with a
` first level data set in 500MB or so. Upon use, it fetches further
` data from the net as you zoom, and you are advised to have a couple
` of free Gigs for it to fill with cache. The realtime zoom and
` drag require a good 3D vidcard, and I imagine spinning round in the
` ground view with relief taxes the vidcard even more. The net fetch
` puts a fair load on your IP connection, and dialup is not recommended,
` so it really wants a high end machine for best results. As mine
` is rather that way in most respects these days, I can't say how
` the performance degrades with a less powerful machine.

` Anyway, spending happy hours drifting about the virtual globe, I have
` noticed a distinct feature in western Libya, along the border with
` Algeria. It appears to be a pair of concentric arcs, representing say 9
` o'clock to noon, which if completed would encircle a region slightly
` smaller than Spain. And indeed there seem to be other features which could
` be candidates for further outcroppings of a circular structure, around 4
` to 6 oclock. Well, obviously the notion of meteor crater comes to mind,
` but I haven't heard of this being proposed for this region, and were it,
` it would be far and away the largest known. I presume this feature is
` well known, and there is another explanation for it, and I wondered
` if you folks could enlighten me about it. Thanks.

--
==========================================================================
vincent@triumf[munge].ca Pete Vincent
Disclaimer: all I know I learned from reading Usenet.
.

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