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- 05-13-2006
  Re: How to lock the GPS data to the road
| Hans-Georg Mich... | 05-14-2006 |
 Re: How to lock the GPS data to the road
| George Pinson | 05-15-2006 |
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I am using Mapinfo to display some offline gps data that i collect with my
PPC. Most of the time the points fall far from the road. Do you a solution
to lock the gps data to the road ? Maybe a small mapinfo application which
will modify the original gps data to correct it according to the segment
information .
Thank you
Jack
On Sat, 13 May 2006 21:08:17 +0300, Jack Darsa wrote:
Jack,
I don't have a direct answer to your question, but some remarks
on the sidelines.
Most Garmin GPS receivers have a Lock on Road function. So if
you have a Garmin, activate that function.
However, I find that since the intentional distortion called SA
(Selective Availability) has been disabled years ago, there is
actually no need for the Lock on Road function, because accuracy
is now below 10 m (33 ft) most of the time. I have meanwhile
disabled that function and can now see which side of the road
I'm on.
If your receiver gives you significantly worse accuracy, then
the problem is in the receiver, and I believe in solving
problems at their source. Perhaps you need to get a better
receiver.
Hans-Georg
--
No mail, please.
On Sun, 14 May 2006 18:48:17 +0200, Hans-Georg Michna
>On Sat, 13 May 2006 21:08:17 +0300, Jack Darsa wrote:
>>I am using Mapinfo to display some offline gps data that i collect with my
>>PPC. Most of the time the points fall far from the road. Do you a solution
>>to lock the gps data to the road ? Maybe a small mapinfo application which
>>will modify the original gps data to correct it according to the segment
>>information .
>>PPC. Most of the time the points fall far from the road. Do you a solution
>>to lock the gps data to the road ? Maybe a small mapinfo application which
>>will modify the original gps data to correct it according to the segment
>>information .
>Jack,
>I don't have a direct answer to your question, but some remarks
>on the sidelines.
>Most Garmin GPS receivers have a Lock on Road function. So if
>you have a Garmin, activate that function.
>However, I find that since the intentional distortion called SA
>(Selective Availability) has been disabled years ago, there is
>actually no need for the Lock on Road function, because accuracy
>is now below 10 m (33 ft) most of the time. I have meanwhile
>disabled that function and can now see which side of the road
>I'm on.
>If your receiver gives you significantly worse accuracy, then
>the problem is in the receiver, and I believe in solving
>problems at their source. Perhaps you need to get a better
>receiver.
>Hans-Georg
I use a program called USAPhotoMaps. (You can get it here
>I don't have a direct answer to your question, but some remarks
>on the sidelines.
>Most Garmin GPS receivers have a Lock on Road function. So if
>you have a Garmin, activate that function.
>However, I find that since the intentional distortion called SA
>(Selective Availability) has been disabled years ago, there is
>actually no need for the Lock on Road function, because accuracy
>is now below 10 m (33 ft) most of the time. I have meanwhile
>disabled that function and can now see which side of the road
>I'm on.
>If your receiver gives you significantly worse accuracy, then
>the problem is in the receiver, and I believe in solving
>problems at their source. Perhaps you need to get a better
>receiver.
>Hans-Georg
http://jdmcox.com/ ). With it you can download satellites
photos from terraserver.com. (Assumming that you are in the
US. [If not disregard this post :( ]) Once you have these
photos, you can display your track over the Sat. photos.
When I have done this, almost all of the time the track will
be on the road I was traveling, most of the time it will
show me on the correct side of the road and a good bit of
the time it was in the correct lane.
It has been my experience that since S.A. was turned off,
errors when displaying position on maps are the problem with
the map, not the GPS. I know there are exceptions, multi
path errors, and very poor DOP (satellite positions) are a
couple, but they are most of the time (IMHO) the exception
not the rule.
Have you checked that your datums are set correctly. The Datum on the Map
must also be the Datum on your GPS.
Regards
JM..
> On Sun, 14 May 2006 18:48:17 +0200, Hans-Georg Michna
> >On Sat, 13 May 2006 21:08:17 +0300, Jack Darsa wrote:
> >>I am using Mapinfo to display some offline gps data that i collect with
my
> >>PPC. Most of the time the points fall far from the road. Do you a
solution
> >>to lock the gps data to the road ? Maybe a small mapinfo application
which
> >>will modify the original gps data to correct it according to the segment
> >>information .
> >>information .
> >Jack,
> >I don't have a direct answer to your question, but some remarks
> >on the sidelines.
> >Most Garmin GPS receivers have a Lock on Road function. So if
> >you have a Garmin, activate that function.
> >However, I find that since the intentional distortion called SA
> >(Selective Availability) has been disabled years ago, there is
> >actually no need for the Lock on Road function, because accuracy
> >is now below 10 m (33 ft) most of the time. I have meanwhile
> >disabled that function and can now see which side of the road
> >I'm on.
> >If your receiver gives you significantly worse accuracy, then
> >the problem is in the receiver, and I believe in solving
> >problems at their source. Perhaps you need to get a better
> >receiver.
> >Hans-Georg
> >I don't have a direct answer to your question, but some remarks
> >on the sidelines.
> >Most Garmin GPS receivers have a Lock on Road function. So if
> >you have a Garmin, activate that function.
> >However, I find that since the intentional distortion called SA
> >(Selective Availability) has been disabled years ago, there is
> >actually no need for the Lock on Road function, because accuracy
> >is now below 10 m (33 ft) most of the time. I have meanwhile
> >disabled that function and can now see which side of the road
> >I'm on.
> >If your receiver gives you significantly worse accuracy, then
> >the problem is in the receiver, and I believe in solving
> >problems at their source. Perhaps you need to get a better
> >receiver.
> >Hans-Georg
> I use a program called USAPhotoMaps. (You can get it here
> http://jdmcox.com/ ). With it you can download satellites
> photos from terraserver.com. (Assumming that you are in the
> US. [If not disregard this post :( ]) Once you have these
> photos, you can display your track over the Sat. photos.
> When I have done this, almost all of the time the track will
> be on the road I was traveling, most of the time it will
> show me on the correct side of the road and a good bit of
> the time it was in the correct lane.
> It has been my experience that since S.A. was turned off,
> errors when displaying position on maps are the problem with
> the map, not the GPS. I know there are exceptions, multi
> path errors, and very poor DOP (satellite positions) are a
> couple, but they are most of the time (IMHO) the exception
> not the rule.
> http://jdmcox.com/ ). With it you can download satellites
> photos from terraserver.com. (Assumming that you are in the
> US. [If not disregard this post :( ]) Once you have these
> photos, you can display your track over the Sat. photos.
> When I have done this, almost all of the time the track will
> be on the road I was traveling, most of the time it will
> show me on the correct side of the road and a good bit of
> the time it was in the correct lane.
> It has been my experience that since S.A. was turned off,
> errors when displaying position on maps are the problem with
> the map, not the GPS. I know there are exceptions, multi
> path errors, and very poor DOP (satellite positions) are a
> couple, but they are most of the time (IMHO) the exception
> not the rule.
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>PPC. Most of the time the points fall far from the road. Do you a solution
>to lock the gps data to the road ? Maybe a small mapinfo application which
>will modify the original gps data to correct it according to the segment
>information .