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+ADwAIQ--- Thu, 06 Jan 2022 22:00:03 - Thu, 06 Jan 2022 22:00:03 --+AD4APA-h1 class+AD0AIg-linkback+ACIAPgA8-a href+AD0AIg-https://rec-autos-simulators.net/+ACIAPg-rec.autos.simulators+ADw-/a+AD4APA-/h1+AD4-
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+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Peter Hol+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Mon, 10 Jun 2002 22:55:45+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPg-I've seen plenty of posts regarding the inaccuracy of circuits in some +ADw-br+AD4- motor racing sims, Hungary in F1 2001 springs to mind, and I've noted +ADw-br+AD4- software publishers proudly boasting that they use GPS data to create +ADw-br+AD4- their versions of the tracks. +ADw-br+AD4- +ADw-p+AD4-My knowledge of the GPS system led me to doubt that the system was +ADw-br+AD4- accurate enough to create totally authentic rendition of a track so I +ADw-br+AD4- did some research and found the following quote +ADw-br+AD4- +ADw-p+AD4AJg-quot+ADs-Typical normal accuracy (one-sigma) for welldesigned civil equipment +ADw-br+AD4- under nominal operating conditions with SA off should be about 10 m +ADw-br+AD4- horizontal and 13 m vertical.+ACY-quot+ADs- +ADw-br+AD4- +ADw-p+AD4-For those not yet cursed with Napoleon's measuring system (metric), +ADw-br+AD4- that's about 32 feet horizontal and 42 feet vertical. +ADw-br+AD4- +ADw-p+AD4-Now, for navigation, to find a harbour or an airport or to get you +ADw-br+AD4- home when hiking, that's more than accurate enough but I feel an error +ADw-br+AD4- of that size would make modelling a race circuit accurately very +ADw-br+AD4- unlikely. +ADw-br+AD4- +ADw-p+AD4-For further info on GPS accuracy, check out the links below +ADw-br+AD4- +ADw-p+AD4-http://www.racesimcentral.net/+ADw-br+AD4- http://www.racesimcentral.net/+ADw-br+AD4- +ADw-p+AD4-Peter +ADw-br+AD4APA-/div+AD4-
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+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Tauno Taipaleenmak+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Mon, 10 Jun 2002 23:24:29+ADw-/p+AD4-
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: My knowledge of the GPS system led me to doubt that the system was +ADw-br+AD4- : accurate enough to create totally authentic rendition of a track so I +ADw-br+AD4- : did some research and found the following quote +ADw-br+AD4- : +ADw-br+AD4- : +ACY-quot+ADs-Typical normal accuracy (one-sigma) for welldesigned civil equipment +ADw-br+AD4- : under nominal operating conditions with SA off should be about 10 m +ADw-br+AD4- : horizontal and 13 m vertical.+ACY-quot+ADs- +ADw-br+AD4- +ADw-p+AD4AJg-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- Yes, that's the standard normal accuracy for a GPS receiver you +ADw-br+AD4- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- buy from your local store cheaply. But I doubt they used those +ADw-br+AD4- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- cheap ones for the tracks, because you can rent/buy better ones +ADw-br+AD4- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- if you have the funds. +ADw-br+AD4- +ADw-p+AD4AJg-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- Differential GPS is the way to go for better accuracy. With good +ADw-br+AD4- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- equipment you can get +ACY-lt+ADs-1 meter accuracy. +ADw-br+AD4- +ADw-p+AD4AJg-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- For a track layout, you don't need the absolute position, so it's +ADw-br+AD4- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- possible to use more than one GPS receiver to accurately get the +ADw-br+AD4- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- relative position between the receivers. +ADw-br+AD4- +ADw-p+AD4AJg-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- TTT +ADw-br+AD4APA-/div+AD4-
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+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-Peter Hol+ADw-/dt+AD4-
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+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p3+ACIAPg-GPS data +ACY-amp+ADs- accurate circuit modelling+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Peter Hol+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Mon, 10 Jun 2002 23:45:30+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPg-On 9 Jun 2002 14:24:29 GMT, Tauno Taipaleenmaki +ADw-br+AD4- +ADw-p+AD4APA-div class+AD0AIg-gQuote+ACIAPg-
+ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs-Yes, that's the standard normal accuracy for a GPS receiver you +ADw-br+AD4- +ACY-gt+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs-buy from your local store cheaply. But I doubt they used those +ADw-br+AD4- +ACY-gt+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs-cheap ones for the tracks, because you can rent/buy better ones +ADw-br+AD4- +ACY-gt+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs-if you have the funds. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs-Differential GPS is the way to go for better accuracy. With good +ADw-br+AD4- +ACY-gt+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs-equipment you can get +ACY-lt+ADs-1 meter accuracy. +ADw-br+AD4- +ADw-br+AD4APA-/div+AD4-I'll repeat part of my quote, +ACY-quot+ADs-welldesigned civil equipment+ACY-quot+ADs-. +ACY-nbsp+ADs-As to +ADw-br+AD4- differential GPS and other methods of improving the accuracy, I have +ADw-br+AD4- no evidence that any of that was used and given the errors in tracks, +ADw-br+AD4- every reason to believe that they weren't. +ADw-br+AD4- +ADw-p+AD4-Further, I would argue that 1 meter accuracy is still not sufficent, +ADw-br+AD4- if you have a 1 meter error in where the apex of a corner is located, +ADw-br+AD4- you would alter the nature of the bend completely. +ADw-br+AD4- +ADw-p+AD4-
How does this work? +ADw-br+AD4- +ADw-p+AD4-Peter +ADw-br+AD4APA-/div+AD4-
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+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-Douglas Elliso+ADw-/dt+AD4-
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+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p4+ACIAPg-GPS data +ACY-amp+ADs- accurate circuit modelling+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Douglas Elliso+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Mon, 10 Jun 2002 23:47:22+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPgA8-p+AD4-
I've used GPS a great deal in Gliding -and specifically gps data logging +ADw-br+AD4- during competition gliding. +ADw-br+AD4- +ADw-p+AD4-I once took a GPS reciever and a data logger in a car and drove all around +ADw-br+AD4- the airfield perimiter track, each side of the runway and all service +ADw-br+AD4- roads - then used this data to plot a trace. +ADw-br+AD4- +ADw-p+AD4-Using a large ord. survey map ( 1:2500 ) and arial photographs - we +ADw-br+AD4- determined that the absoloute accuracy was less than 10 metres - and the +ADw-br+AD4- relative accuracy was a great deal less than a metre. ( i.e. it positioned +ADw-br+AD4- one end of a runway relative to the other end with an accuracy of about 75 +ADw-br+AD4- cm) +ADw-br+AD4- +ADw-p+AD4-We were unable to test it's accuracy altitude wise - however - comparing +ADw-br+AD4- baro and GPS altitude recorded by some GPS data loggers - it's usually +ADw-br+AD4- accurate to a dozen feet - BUT - this accuracy is usually consistant. +ADw-br+AD4- +ADw-p+AD4-So -this is with +ACY-lt+ADs-1k gear fitted to most competition gliders. +ADw-br+AD4- +ADw-p+AD4-With the 10k gear that has a proper large GPS antenna ( usually looks like +ADw-br+AD4- a round tupaware thing on a large stick) - the accuracy can be even higher. +ADw-br+AD4- +ADw-p+AD4-It's worth mentioning that in the past 18 months, the US military have +ADw-br+AD4- de-coded GPS which increased it's accuracy by a factor of between 5 and 10. +ADw-br+AD4- +ADw-p+AD4-Futhermore - accuracy increases the more sats. you have connected. the more +ADw-br+AD4- accurate you are. +ACY-nbsp+ADs-4 Sats and you'll be 50m, +ACY-nbsp+ADs-8 sat and you'll be +ADw-br+AD4- laughing+ACE- +ADw-br+AD4- +ADw-p+AD4-Doug +ADw-br+AD4APA-/div+AD4-
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+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p5+ACIAPg-GPS data +ACY-amp+ADs- accurate circuit modelling+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Douglas Elliso+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Tue, 11 Jun 2002 00:06:46+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPgA8-p+AD4-
+ADw-br+AD4- +ADw-p+AD4-
The only circuits modelled with GPS are those in F1RC as far as I'm aware. +ADw-br+AD4- +ADw-p+AD4-And compared to F12001 and F12002 - IT SHOWS +ADw-br+AD4- +ADw-p+AD4-DOug +ADw-br+AD4APA-/div+AD4-
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+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-John Pancoas+ADw-/dt+AD4-
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+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p6+ACIAPg-GPS data +ACY-amp+ADs- accurate circuit modelling+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-John Pancoas+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Tue, 11 Jun 2002 00:11:38+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPgAm-nbsp+ADs- Of course, that's assuming that the marketing wizs aren't stretching the +ADw-br+AD4- truth a bit with their +ACY-quot+ADs-GPS used for the tracks+ACY-quot+ADs- hype. +ADw-br+AD4- +ADw-p+AD4AJg-nbsp+ADs- Nah, they wouldn't do that :) +ADw-br+AD4- +ADw-p+AD4--John +ADw-br+AD4- +ADw-p+AD4-
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+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-Tauno Taipaleenmak+ADw-/dt+AD4-
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+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p7+ACIAPg-GPS data +ACY-amp+ADs- accurate circuit modelling+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Tauno Taipaleenmak+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Tue, 11 Jun 2002 00:18:11+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPg-
: I'll repeat part of my quote, +ACY-quot+ADs-welldesigned civil equipment+ACY-quot+ADs-. +ACY-nbsp+ADs-As to +ADw-br+AD4- : differential GPS and other methods of improving the accuracy, I have +ADw-br+AD4- : no evidence that any of that was used and given the errors in tracks, +ADw-br+AD4- : every reason to believe that they weren't. +ADw-br+AD4- +ADw-p+AD4AJg-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- Well, only those who made the tracks know what was used, but +ADw-br+AD4- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- I agree, the errors in the tracks are bad and obvious. +ADw-br+AD4- +ADw-p+AD4-: Further, I would argue that 1 meter accuracy is still not sufficent, +ADw-br+AD4- : if you have a 1 meter error in where the apex of a corner is located, +ADw-br+AD4- : you would alter the nature of the bend completely. +ADw-br+AD4- +ADw-p+AD4AJg-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- That's also true. +ADw-br+AD4- +ADw-p+AD4AJg-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- The proper way to do the tracks would be to go to the people +ADw-br+AD4- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- who built the tracks, and get accurate drawings from them. +ADw-br+AD4- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- Then they wouldn't have to guess :) I'm sure there has to be +ADw-br+AD4- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- accurate blue-prints of all the tracks somewhere. +ADw-br+AD4- +ADw-p+AD4AJg-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- +ACY-nbsp+ADs- TTT +ADw-br+AD4APA-/div+AD4-
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+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-Peter Hol+ADw-/dt+AD4-
+ADw-/dl+AD4-
+ADw-div class+AD0AIg-postbody+ACIAPg-
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+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Peter Hol+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Tue, 11 Jun 2002 00:33:31+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPg-On Sun, 9 Jun 2002 15:47:22 +010-, +ACY-quot+ADs-Douglas Ellison+ACY-quot+ADs- +ADw-br+AD4- +ADw-p+AD4APA-div class+AD0AIg-gQuote+ACIAPg-
+ADw-br+AD4- +ADw-p+AD4AJg-gt+ADsAJg-gt+ADs- +ACY-quot+ADs-Typical normal accuracy (one-sigma) for welldesigned civil equipment +ADw-br+AD4- +ACY-gt+ADsAJg-gt+ADs- under nominal operating conditions with SA off should be about 10 m +ADw-br+AD4- +ACY-gt+ADsAJg-gt+ADs- horizontal and 13 m vertical.+ACY-quot+ADs- +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs-With the 10k gear that has a proper large GPS antenna ( usually looks like +ADw-br+AD4- +ACY-gt+ADs-a round tupaware thing on a large stick) - the accuracy can be even higher. +ADw-br+AD4- +ADw-br+AD4APA-/div+AD4-If you check the links in my original post, you'll see that most of +ADw-br+AD4- the factors that degrade the accuracy of GPS are not related to the +ADw-br+AD4- receiver. +ACY-nbsp+ADs-The most significant factor is ionosphereic distortion of +ADw-br+AD4- the signal +ADw-br+AD4- +ADw-p+AD4-
That's the removal of SA (selective availability) in 2000. +ACY-nbsp+ADs-The +ADw-br+AD4- accuracy figures I quoted are with SA off. +ADw-br+AD4-
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+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p9+ACIAPg-GPS data +ACY-amp+ADs- accurate circuit modelling+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-ymenar+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Tue, 11 Jun 2002 04:45:04+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPgA8-p+AD4APA-div class+AD0AIg-gQuote+ACIAPg-
+ADw-br+AD4- +ACY-gt+ADs- For further info on GPS accuracy, check out the links below +ADw-br+AD4- +ADw-br+AD4APA-/div+AD4AJg-quot+ADs-GPS+ACY-quot+ADs- track measuring is mostly a PR gimmick for game publishers. +ACY-nbsp+ADs-The +ADw-br+AD4- developpers mostly use it for basic things like the position of objects +ADw-br+AD4- around the track (from the grandstands to trees). +ACY-nbsp+ADs-The track itself is +ADw-br+AD4- modeled from the architectural layouts of the track and very inside +ADw-br+AD4- information. +ACY-nbsp+ADs-That is what I was told. +ADw-br+AD4- +ADw-p+AD4-That is, if the developper has the time to model it that way. +ACY-nbsp+ADs-Most of them +ADw-br+AD4- (in the most blattant case, ISI and somehow Geoff Crammond's team) decide to +ADw-br+AD4- go the quick way. +ACY-nbsp+ADs-Realism in track layout is very difficult. +ACY-nbsp+ADs-The basics +ADw-br+AD4- are easy, but with each layer of detail come in another layer of complexity. +ADw-br+AD4- Therefore, time and therefore, money for the mentality of game producers. +ADw-br+AD4- Shame on EA, I say. +ACY-nbsp+ADs-Shame on ISI for not pushing the accuracy of tracks as +ADw-br+AD4- important to EA. +ADw-br+AD4- +ADw-p+AD4--- +ADw-br+AD4- -- Fran?ois Mnard +ACY-lt+ADs-ymenard+ACY-gt+ADs- +ADw-br+AD4- -- http://www.ymenard.8m.com/ +ADw-br+AD4- -- This announcement is brought to you by the Shimago-Dominguez +ADw-br+AD4- Corporation - helping America into the New World... +ADw-br+AD4APA-/div+AD4-
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+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-Douglas Elliso+ADw-/dt+AD4-
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+ADw-div class+AD0AIg-postbody+ACIAPg-
+ADw-div id+AD0AIg-post+AF8-content10+ACIAPg-
+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p10+ACIAPg-GPS data +ACY-amp+ADs- accurate circuit modelling+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Douglas Elliso+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Tue, 11 Jun 2002 06:38:10+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPgA8-p+AD4-
The track wont necessarily match the blue prints. +ADw-br+AD4- +ADw-p+AD4-Arial photograph, high scale maps, and plenty of photographic and video +ADw-br+AD4- research should be enough - GPS is a nice time saver in some respects. +ADw-br+AD4- +ADw-p+AD4-Doug +ADw-br+AD4APA-/div+AD4-
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+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-David G Fishe+ADw-/dt+AD4-
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+ADw-div class+AD0AIg-postbody+ACIAPg-
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+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-David G Fishe+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Tue, 11 Jun 2002 07:46:54+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPg-F1RC uses GPS. I've seen F1RC screenshots and real pics merged together, and +ADw-br+AD4- F1RC has the tracks almost perfect. +ADw-br+AD4- +ADw-p+AD4-David G Fisher +ADw-br+AD4- +ADw-p+AD4-
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+ADw-div class+AD0AIg-avatar-container+ACIAPgA8-/div+AD4-John Metco+ADw-/dt+AD4-
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+ADw-div class+AD0AIg-postbody+ACIAPg-
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+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-John Metco+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Tue, 11 Jun 2002 10:35:28+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPg-WITHOUT GPS +ADw-br+AD4- would it be possible to get a good and accurate +ADw-br+AD4- mapping ?? +ADw-br+AD4- +ADw-p+AD4-let's read some of the responses to this:+AD0- +ADw-br+AD4- +ADw-p+AD4-:+AD0-)) +ADw-br+AD4- +ADw-p+AD4-
+ADw-br+AD4- +ADw-div class+AD0AIg-gQuote+ACIAPgAm-gt+ADs- On 9 Jun 2002 14:24:29 GMT, Tauno Taipaleenmaki +ADw-br+AD4-
+ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- Yes, that's the standard normal accuracy for a GPS +ADw-br+AD4- receiver you +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- buy from your local store cheaply. But I doubt they +ADw-br+AD4- used those +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- cheap ones for the tracks, because you can rent/buy +ADw-br+AD4- better ones +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- if you have the funds. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- Differential GPS is the way to go for better +ADw-br+AD4- accuracy. With good +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- equipment you can get +ACY-lt+ADs-1 meter accuracy. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- I'll repeat part of my quote, +ACY-quot+ADs-welldesigned civil +ADw-br+AD4- equipment+ACY-quot+ADs-. +ACY-nbsp+ADs-As to +ADw-br+AD4- +ACY-gt+ADs- differential GPS and other methods of improving the +ADw-br+AD4- accuracy, I have +ADw-br+AD4- +ACY-gt+ADs- no evidence that any of that was used and given the +ADw-br+AD4- errors in tracks, +ADw-br+AD4- +ACY-gt+ADs- every reason to believe that they weren't. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- Further, I would argue that 1 meter accuracy is still +ADw-br+AD4- not sufficent, +ADw-br+AD4- +ACY-gt+ADs- if you have a 1 meter error in where the apex of a +ADw-br+AD4- corner is located, +ADw-br+AD4- +ACY-gt+ADs- you would alter the nature of the bend completely. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- For a track layout, you don't need the absolute +ADw-br+AD4- position, so it's +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- possible to use more than one GPS receiver to +ADw-br+AD4- accurately get the +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- relative position between the receivers. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- How does this work? +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- Peter +ADw-br+AD4- +ADw-br+AD4APA-/div+AD4APA-/div+AD4-
+ADw-/div+AD4-
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+ADw-div class+AD0AIg-content+ACIAPg-Once upon a time a transit and a couple of people who knew how to use it +ADw-br+AD4- was considered good enough. +ADw-br+AD4- +ADw-p+AD4-
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+ADw-h3 class+AD0AIg-first+ACIAPgA8-a href+AD0AIgAj-p14+ACIAPg-GPS data +ACY-amp+ADs- accurate circuit modelling+ADw-/a+AD4APA-/h3+AD4-
+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-ymenar+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Tue, 11 Jun 2002 12:39:31+ADw-/p+AD4-
+ADw-div class+AD0AIg-content+ACIAPgA8-p+AD4APA-div class+AD0AIg-gQuote+ACIAPg-
+ADw-br+AD4- +ACY-gt+ADs- WITHOUT GPS +ADw-br+AD4- +ACY-gt+ADs- would it be possible to get a good and accurate +ADw-br+AD4- +ACY-gt+ADs- mapping ?? +ADw-br+AD4- +ADw-br+AD4APA-/div+AD4-Of course, like I wrote it's mostly a PR gimmick. +ACY-nbsp+ADs-It just takes time, and +ADw-br+AD4- that is not always something developers have. +ADw-br+AD4- +ADw-p+AD4--- +ADw-br+AD4- -- Fran?ois Mnard +ACY-lt+ADs-ymenard+ACY-gt+ADs- +ADw-br+AD4- -- http://www.ymenard.8m.com/ +ADw-br+AD4- -- This announcement is brought to you by the Shimago-Dominguez +ADw-br+AD4- Corporation - helping America into the New World... +ADw-br+AD4APA-/div+AD4-
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+ADw-p class+AD0AIg-author+ACIAPg-
+ADw-span class+AD0AIg-responsive-hide+ACIAPg-by +ADw-strong+AD4-Stu+ADw-/strong+AD4- +ACY-raquo+ADs- +ADw-/span+AD4-Tue, 11 Jun 2002 16:49:28+ADw-/p+AD4-
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Yes there are mapping techniques far better suited to this type of modelling. +ADw-br+AD4- +ADw-p+AD4-GPS provides point-data. And loosely accurate point data at that. At best you +ADw-br+AD4- end up with a XYZ co-ordinate at each side of the track, say every 10-15m along +ADw-br+AD4- the route. +ACY-nbsp+ADs-That is a loose model to build up the subtle rises and falls in the +ADw-br+AD4- surface. +ACY-nbsp+ADs-And requires about 1000 samples per track, which equates to a lot of +ADw-br+AD4- man hours. +ACY-nbsp+ADs-For a sloppy model. +ADw-br+AD4- +ADw-p+AD4-What you really want is stream data providing continuous contours of the +ADw-br+AD4- surface. +ACY-nbsp+ADsAJg-quot+ADs-Digital Stereo Photogrammetry+ACY-quot+ADs- is tailor made. +ACY-nbsp+ADs-This uses overlapping +ADw-br+AD4- vertical aerial photographs to pick up the contours in the overlap. It would be +ADw-br+AD4- possible to pick up about a 10cm change in elevation and cover the +ACo-whole+ACo- track +ADw-br+AD4- with accurate co-ordinates in one evening. +ACY-nbsp+ADs-It is very difficult to explain +ADw-br+AD4- thoroughly, check it out here if you are curious: +ADw-br+AD4- http://www2.erdas.com/supportsite/focus3/explanation.html+ACM-DTM+AF8-extract +ADw-br+AD4- +ADw-p+AD4-Photogrammetry is ifininately more thorough and accurate and more importantly, +ADw-br+AD4- doesnt require a team junket to every racetrack. +ACY-nbsp+ADs-Just hire a local surveyor at +ADw-br+AD4- each track to organise the aerial photo's and voila +ADw-br+AD4- +ADw-p+AD4-I laugh every time I read about GPS accurate tracks. +ADw-br+AD4- +ADw-p+AD4-Stu +ADw-br+AD4- +ADw-p+AD4-ps. Attn. ISI / GP 2.3.2000.4 team - Im available to fix your models - for ever. +ADw-br+AD4- And i'm cheap - you can pay me in Ozzie dollars +ADs--) +ADw-br+AD4- +ADw-div class+AD0AIg-gQuote+ACIAPgAm-gt+ADs- let's read some of the responses to this:+AD0- +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- :+AD0-)) +ADw-br+AD4- +ADw-p+AD4-
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+ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- On 9 Jun 2002 14:24:29 GMT, Tauno Taipaleenmaki +ADw-br+AD4-
+ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- +ACY-gt+ADs- Yes, that's the standard normal accuracy for a GPS +ADw-br+AD4- +ACY-gt+ADs- receiver you +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- +ACY-gt+ADs- buy from your local store cheaply. But I doubt they +ADw-br+AD4- +ACY-gt+ADs- used those +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- +ACY-gt+ADs- cheap ones for the tracks, because you can rent/buy +ADw-br+AD4- +ACY-gt+ADs- better ones +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- +ACY-gt+ADs- if you have the funds. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- +ACY-gt+ADs- Differential GPS is the way to go for better +ADw-br+AD4- +ACY-gt+ADs- accuracy. With good +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- +ACY-gt+ADs- equipment you can get +ACY-lt+ADs-1 meter accuracy. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- I'll repeat part of my quote, +ACY-quot+ADs-welldesigned civil +ADw-br+AD4- +ACY-gt+ADs- equipment+ACY-quot+ADs-. +ACY-nbsp+ADs-As to +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- differential GPS and other methods of improving the +ADw-br+AD4- +ACY-gt+ADs- accuracy, I have +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- no evidence that any of that was used and given the +ADw-br+AD4- +ACY-gt+ADs- errors in tracks, +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- every reason to believe that they weren't. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- Further, I would argue that 1 meter accuracy is still +ADw-br+AD4- +ACY-gt+ADs- not sufficent, +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- if you have a 1 meter error in where the apex of a +ADw-br+AD4- +ACY-gt+ADs- corner is located, +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- you would alter the nature of the bend completely. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- +ACY-gt+ADs- For a track layout, you don't need the absolute +ADw-br+AD4- +ACY-gt+ADs- position, so it's +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- +ACY-gt+ADs- possible to use more than one GPS receiver to +ADw-br+AD4- +ACY-gt+ADs- accurately get the +ADw-br+AD4- +ACY-gt+ADs- +ACY-gt+ADs- +ACY-gt+ADs- relative position between the receivers. +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- How does this work? +ADw-br+AD4- +ADw-p+AD4AJg-gt+ADs- +ACY-gt+ADs- Peter +ADw-br+AD4- +ADw-br+AD4APA-/div+AD4APA-/div+AD4-
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+ADw-p+AD4-1. +ADw-a href+AD0AIg-http://www.racesimcentral.net/6+AF8-16d52273dbd8222f+AF8-1.htm+ACIAPg-WANTED: 1957 Venezuela GP +ACY-amp+ADs- Cuban GPs 1957 +ACY-amp+ADs- 1960 data+ADw-/a+AD4APA-/p+AD4-
+ADw-p+AD4-2. +ADw-a href+AD0AIg-http://www.racesimcentral.net/14+AF8-9ac7a94a7e6240c4+AF8-1.htm+ACIAPg-WANTED: 1957 Venezuelan GP, 1957 +ACY-amp+ADs- 1960 Cuban GP data+ADw-/a+AD4APA-/p+AD4-
+ADw-p+AD4-3. +ADw-a href+AD0AIg-http://www.racesimcentral.net/1+AF8-8b05c19f94e89ac1+AF8-1.htm+ACIAPg-GPS check: is speedometer accurate?+ADw-/a+AD4APA-/p+AD4-
+ADw-p+AD4-4. +ADw-a href+AD0AIg-http://www.racesimcentral.net/6+AF8-ac72540431b3ef31+AF8-1.htm+ACIAPg-CR+ACYAIw-39+ADs-s Insufficient Data +ACY-amp+ADs- Reliability /Subjective Data+ADw-/a+AD4APA-/p+AD4-
+ADw-p+AD4-5. +ADw-a href+AD0AIg-http://www.racesimcentral.net/1+AF8-eca512bae1e21996+AF8-1.htm+ACIAPg-Using GPS Data to Fight Speeding Ticket: You+ACYAIw-39+ADs-re Doing It Wrong+ADw-/a+AD4APA-/p+AD4-
+ADw-p+AD4-6. +ADw-a href+AD0AIg-8+AF8-a7b2241c33852600+AF8-1.html+ACIAPg-MPS GP LINK DATA MISMATCH+ADw-/a+AD4APA-/p+AD4-
+ADw-p+AD4-7. +ADw-a href+AD0AIg-8+AF8-b9ce887ed007e642+AF8-1.html+ACIAPg-GPS data for track creation+ADw-/a+AD4APA-/p+AD4-
+ADw-p+AD4-8. +ADw-a href+AD0AIg-http://www.racesimcentral.net/13+AF8-ce7e2ae04c29b2c1+AF8-1.htm+ACIAPg-FS: Magellan GPS Power/Data Module+ADw-/a+AD4APA-/p+AD4-
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