[AT] OT-now GPS

[Henry Miller]

Not very accurate. A self driving car needs to have the ability to "see".  The hiway department has a habit of changing lane markings without warning, if the car can't see that change it will not be in the right spot on the road no matter how accurate the GPS is. Once you have enough vision to figure you what lane you are in, it is trivial to figure out where you are so long as the GPS is within 500 feet. 

People worry about if they can trust computers to drive their car. I always remind them computers don't have to be perfect, just better than you or I. that is a much lower quality bar. (most people are not honest enough to admit how bad they are at driving) 

On April 8, 2015 6:45:09 PM CDT, charlie hill <charliehill at embarqmail.com> wrote:
>I think Google, Mercedes and Audi are using GPS  to drive cars these
>days.  How accurate does that have to be?
>
>Charlie
>
>-----Original Message----- 
>From: Ralph Goff
>Sent: Wednesday, April 08, 2015 9:48 AM
>To: Antique tractor email discussion group
>Subject: Re: [AT] OT-now GPS
>
>On 4/8/2015 5:05 AM, Henry Miller wrote:
>> The laws of physics prevent the satellite only systems from getting
>more 
>> accurate than about 16 feet. You know how on a hot day things
>sometimes 
>> get wavy off in the distance? Same thing happens to satellite
>signals, and 
>> the satellite is much farther away than those hazy things.
>>
>>   Throw in something on the ground and you can get much closer.
>>
>> Disclaimer, I work for John Deere on the 4600 displays. I'm not
>speaking 
>> for them though.
>>
>16 feet? I would have to question that law. I use my trimble ezee guide
>running off the free satellites for seeding crops every spring now. It
>is a 28 foot wide seeder and I can easily check the accuracy just by
>looking over my shoulder at the ground , then glancing at the screen.
>Seems like they match up the lines pretty well. The only misses I see
>in
>the field are where I fall asleep and wander off the line :-)
>I even use it as an acreage counter since the mechanical counter quit
>on
>the air seeder unit. I find it to be quite accurate. Maybe not the sub
>inch accuracy of the rtk systems but plenty good enough for me.
>
>Ralph in Sask.
>
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