Xmas pressies - anyone recommend a good GPS device?

Alle 17:38, martedì 12 dicembre 2006, Fabien ha scritto:
> Angelo Naselli wrote:
> > Alle 11:59, martedì 12 dicembre 2006, Gilles
Caulier ha scritto:
> > 
> >>On Tuesday 12 December 2006 11:41, Colin
Guthrie wrote:
> >>
> >>>Hi,
> >>>
> >>>Seeing as Gilles has put in some excellent
work on the GPS plugin, I'm
> >>>eager to start GPSing my photos (especially
my skiing/boarding holidays
> >>>etc.).
> >>>
> >>>Can anyone recommend a nice, compact, linux
friendly GPS device?
> >>>
> >>>I don't really know where to begin with GPS
on linux support, so figure
> >>>here is a good place to ask 
> >>>
> >>>Col.
> >>
> >>This one :
> >>
> >>http://www.dpreview.com/news/0608/06080202sonygpscs1.asp

> > 
> > Gilles, if you don't have a sony camera?
> > 
> > BTW, how does it work?
> 
> The GPS just keeps a track with GPS position and
date/time (very 
> accurate in GPS devices). Then, the software (eg
gpssync kipi-plugins or 
> the windows software they provide) uses the date/time
in the digital 
> camera (usually not accurate at all) to get the right
position 
> So, it's independant of the manufacturer (but I don't
know anything 
> about their windows software).
> 
> The only important point is to define precisely the
date/time of the 
> digital camera (at least once a week because it's not
accurate at all).
> Somebody suggested to take a picture of a GPS date/time
to check the 
> time (if your GPS provides this feature) and I think
it's a simple but 
> great idea 
argh! I thought it was connected to the camera.... that
should be better...
so it works if we remember to swith it on when we're using
our camera and
if the camera is synked with the gps device...  

It's not very hi tech ;)

Angelo
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>>> BTW, how does it work?
>> The GPS just keeps a track with GPS position and
date/time (very 
>> accurate in GPS devices). Then, the software (eg
gpssync kipi-plugins or 
>> the windows software they provide) uses the
date/time in the digital 
>> camera (usually not accurate at all) to get the
right position 
>> So, it's independant of the manufacturer (but I
don't know anything 
>> about their windows software).
>>
>> The only important point is to define precisely the
date/time of the 
>> digital camera (at least once a week because it's
not accurate at all).
>> Somebody suggested to take a picture of a GPS
date/time to check the 
>> time (if your GPS provides this feature) and I
think it's a simple but 
>> great idea 
> argh! I thought it was connected to the camera.... that
should be better...
> so it works if we remember to swith it on when we're
using our camera and
> if the camera is synked with the gps device...  
> 

Note that the sync problem is solved if you know the
position of at 
least one of the pictures.

Julien


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Alle 19:27, martedì 12 dicembre 2006, Julien Narboux ha
scritto:
> 
> >>> BTW, how does it work?
> >> The GPS just keeps a track with GPS position
and date/time (very 
> >> accurate in GPS devices). Then, the software
(eg gpssync kipi-plugins or 
> >> the windows software they provide) uses the
date/time in the digital 
> >> camera (usually not accurate at all) to get
the right position 
> >> So, it's independant of the manufacturer (but
I don't know anything 
> >> about their windows software).
> >>
> >> The only important point is to define
precisely the date/time of the 
> >> digital camera (at least once a week because
it's not accurate at all).
> >> Somebody suggested to take a picture of a GPS
date/time to check the 
> >> time (if your GPS provides this feature) and I
think it's a simple but 
> >> great idea 
> > argh! I thought it was connected to the camera....
that should be better...
> > so it works if we remember to swith it on when
we're using our camera and
> > if the camera is synked with the gps device...  
> > 
> 
> Note that the sync problem is solved if you know the
position of at 
> least one of the pictures.
hmmm I was thinking to the time not the position

Angelo
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Angelo Naselli a écrit :
> Alle 19:27, martedì 12 dicembre 2006, Julien Narboux ha
scritto:
>>>>> BTW, how does it work?
>>>> The GPS just keeps a track with GPS
position and date/time (very 
>>>> accurate in GPS devices). Then, the
software (eg gpssync kipi-plugins or 
>>>> the windows software they provide) uses the
date/time in the digital 
>>>> camera (usually not accurate at all) to get
the right position 
>>>> So, it's independant of the manufacturer
(but I don't know anything 
>>>> about their windows software).
>>>>
>>>> The only important point is to define
precisely the date/time of the 
>>>> digital camera (at least once a week
because it's not accurate at all).
>>>> Somebody suggested to take a picture of a
GPS date/time to check the 
>>>> time (if your GPS provides this feature)
and I think it's a simple but 
>>>> great idea 
>>> argh! I thought it was connected to the
camera.... that should be better...
>>> so it works if we remember to swith it on when
we're using our camera and
>>> if the camera is synked with the gps device... 

>>>
>> Note that the sync problem is solved if you know
the position of at 
>> least one of the pictures.
> hmmm I was thinking to the time not the position
> 

I mean If you know the position of at least one picture.
You can find to which points it corresponds to on the track.
If there is 
only one point on the track that matches the position (that
means that 
you did not went twice in that place) then you can deduce
the time shift 
between the gps device and the camera. Once you have the
time shift you 
can deduce the other positions.

Julien

> Angelo
> 
> 
>
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> 
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Le mardi 12 décembre 2006 22:30, Julien Narboux a écrit :
> Angelo Naselli a écrit :
> > Alle 19:27, martedì 12 dicembre 2006, Julien
Narboux ha scritto:
> >>>>> BTW, how does it work?
> >>>>
> >>>> The GPS just keeps a track with GPS
position and date/time (very
> >>>> accurate in GPS devices). Then, the
software (eg gpssync kipi-plugins
> >>>> or the windows software they provide)
uses the date/time in the
> >>>> digital camera (usually not accurate
at all) to get the right position
> >>>>  So, it's
independant of the manufacturer (but I don't know anything
> >>>> about their windows software).
> >>>>
> >>>> The only important point is to define
precisely the date/time of the
> >>>> digital camera (at least once a week
because it's not accurate at
> >>>> all). Somebody suggested to take a
picture of a GPS date/time to check
> >>>> the time (if your GPS provides this
feature) and I think it's a simple
> >>>> but great idea 
> >>>
> >>> argh! I thought it was connected to the
camera.... that should be
> >>> better... so it works if we remember to
swith it on when we're using
> >>> our camera and if the camera is synked
with the gps device...
> >>
> >> Note that the sync problem is solved if you
know the position of at
> >> least one of the pictures.
> >
> > hmmm I was thinking to the time not the position
>
> I mean If you know the position of at least one
picture.
> You can find to which points it corresponds to on the
track. If there is
> only one point on the track that matches the position
(that means that
> you did not went twice in that place) then you can
deduce the time shift
> between the gps device and the camera. Once you have
the time shift you
> can deduce the other positions.
>
> Julien

Angelo, like Julien explain, this is the way to use 'Max.
Gap Time' and 'Max 
Distance Interpolation Time' oprion in GPS correlator :

http://www.kde-apps.org/co
ntent/preview.php?preview=3&id=16061&file1=16061-1.j
pg&file2=16061-2.jpg&file3=16061-3.jpg&name=Kipi


Use widgets tooltip for details...

Gilles
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> I mean If you know the position of at least one
picture.
> You can find to which points it corresponds to on the
track. If there is 
> only one point on the track that matches the position
(that means that 
> you did not went twice in that place) then you can
deduce the time shift 
> between the gps device and the camera. Once you have
the time shift you 
> can deduce the other positions.
that's true, but I believe it's easier to sync date &
time on both 
devieces, I was just thinking about a square ;)

Angelo
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On Tue, 12 Dec 2006, Julien Narboux wrote:

[...]
> I mean If you know the position of at least one
picture.
> You can find to which points it corresponds to on the
track. If there is
> only one point on the track that matches the position
(that means that
> you did not went twice in that place) then you can
deduce the time shift
> between the gps device and the camera. Once you have
the time shift you
> can deduce the other positions.

And if you have a GPS device which displays the time
it should be easy to determine the time difference even
after a trip:
just look at the GPS time and
compare it with the current time displayed in the camera.
(This of course assumes that the time-drift of the camera
is not that bad in the course of one day .

Best, Arnd
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> And if you have a GPS device which displays the time
> it should be easy to determine the time difference even
after a trip:
> just look at the GPS time and
> compare it with the current time displayed in the
camera.
> (This of course assumes that the time-drift of the
camera
> is not that bad in the course of one day .
well I know some old cameras miss date/time if you pull out
the batteries...
Not always easy anyway...

Angelo
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Alle 15:50, mercoledì 13 dicembre 2006, Angelo Naselli ha
scritto:
> well I know some old cameras miss date/time if you pull
out the
> batteries... Not always easy anyway...

Not so old as you think.... My Acer CI6330 (3 months old) is
one of 
those :'(

> Angelo

Valerio
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Hi,

searching for a good GPS device gets one into
a nice jungle of technical specifications, chipsets,
biased and unbiased comparisons/opinions/... etc.
I will try to post a summary once I see a bit clearer.
BTW: is there a wiki for kde-imaging/digikam which
we could use to collect this type of information (if there
is interest)?


Concerning the Sony GPS-CS1:
Does anyone here already own this?
Does anyone know, what chipset it is using?
And if yes, what is the accuracy?
(In particular in comparison with the garmin devices?)

Doing omething like
http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID
=57588
might be interesting ...

Best, Arnd
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