I'll take a look at those links, thanks. 
My impression is that a good percentage of users are not to the point of using 
metar, and apparently may use unlimited all the time. I don't know if there is 
any data to support that, but I've not seen a low frame rate outside of ksfo. 
Of the other hand its a way to "weed out" the gamer...
Just thoughts I'm sure were considered before. 

Peter Brown
------Original Message------
From: Melchior FRANZ
To: [email protected]
ReplyTo: FlightGear developers discussions
Subject: Re: [Flightgear-devel] --metar and --enable-real-weather-fetch
Sent: Dec 20, 2009 4:38 PM

* Peter Brown -- Sunday 20 December 2009:
> IMHO there is no choice other than the bold solution- anything reported as
> 10SM = unlimited, and 9.99 and less is actual. 

And so guaranteeing the lowest possible frame rate? Sounds like a truly bad
idea. The whole thing has been discussed before. (Threads "Flying over an
island" and "Estimating visibility"). Thomas FOERSTER announced that he'd
use some Bayesian analysis to get a formula from various available parameters,
such as temperatures, air pressure etc.

  
http://www.mail-archive.com/[email protected]/msg15710.html
  
http://www.mail-archive.com/[email protected]/msg15843.html
  
http://www.mail-archive.com/[email protected]/msg15851.html

In any case, if someone writes a heuristic, then this does *not* belong
into SGMetar but FGMetar. Unless the weather subsystem is the next which
is going to be ruined ...

m.

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