From: firstname.lastname@example.org (Stephen H. Westin) Date: 26 Apr 2000 11:30:47 -0700 Organization: Cornell University Program of Computer Graphics References: 1
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email@example.com (brian whatcott) writes: <snip> > Well, well. This dead reckoning suggestion of Paul's took me back a > few years to a visit I made to the Dublin Bus Company. > > They adopted a very forward looking scheme in the 70's to monitor > public transport buses in their system in real time - with a radio > link at a control center with traffic displays. > > Before GPS and the like were a viable choice, they were using bus > wheel counters to transmit progressive position reports with lamp post > mounted interrogators to keep the drift in bounds. I believe Etak was founded on the basis of similar technology: compass and wheel rotation for dead-reckoning automotive navigation. At one point, GM bought a chunk of the company, I think. Apparently they digitized lots of map data, which forms the core of the business today. They are apparently owned by Sony. -- -Stephen H. Westin Any information or opinions in this message are mine: they do not represent the position of Cornell University or any of its sponsors.