There were three panels on worldbuilding, one on each day, and then a 'Hard SF' panel that felt similar, except it was about the other aspects than geography.
Russell Kirkpatrick had the first of the worldbuilding panels all to himself, and he could carry it, too - apparently he spent a year mapping his world before writing his novel, and he has the maps to prove it. He doesn't have the complete 1:50 000 series (I asked - "now that you mention it, though..."), but he does have a lot. An enlargement of four sheets of the 1:2 million series decorated the wall outside the dealers' room for the rest of the con, looking for all the world like a real map.
The textbook "Physical Geography" by Strahler & Strahler was recommended.
In general, there seemed to be a consensus that worldbuilding should be like an iceberg - 10% visible to the reader, 90% below the surface, but the 90% has to be done otherwise it shows. By the third panel, this dictum was being attributed to Hemmingway or someone. (There was one dissension that I remember, that one should only build what appears on the screen, and that the characters bring their world with them rather than the other way around.)
A lot of the Hard SF panel felt to me to be about world-building in the wider sense: about building the science, computing, economics, biology, sociology and so on; and a point that the human face and the human psyche are the hardest thing one can write about.
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