GPS - Plot GPS data with GPS time of week and UTC time on the x-axis

Author

Plot GPS data with GPS time of week and UTC time on the x-axis

Glenn MacGougan

2007-12-29, 12:33 pm

I've put together an open source app, plot2d (http://
plot2d.sourceforge.net), for plotting data (from ASCII files, almost
any delimiter) directly to a compressed image. It uses a simple ASCII
options file. It can also generate statistics for each series.

The program lets you plot GPS time of week and UTC time on the x-axis.

An example data file with GPS time of week as a column can be
downloaded here:
https://plot2d.svn.sourceforge.net/...sitionError.txt
The first column is GPS time of week followed by error_N (m) error_E
(m) error_UP (m) error_2D (m) error_3D (m).

The project is still in the Alpha development stage. I'm looking for
further design feedback on the software.

What do you think of the target application? Batch/script files for
generating plots+statistics directly to compressed bitmaps.

Would you use this application and why/why not?

What is lacking in the documentation?

If you're keen, some review of the source is always appreciated.

Darius

2007-12-29, 3:33 pm

On Dec 29, 6:42 pm, Glenn MacGougan <glenn.macgou...@gmail.com> wrote:
> I've put together an open source app, plot2d (http://
> plot2d.sourceforge.net), for plotting data (from ASCII files, almost
> any delimiter) directly to a compressed image. It uses a simple ASCII
> options file. It can also generate statistics for each series.
>
> The program lets you plot GPS time of week and UTC time on the x-axis.
>
> An example data file with GPS time of week as a column can be
> downloaded here:https://plot2d.svn.sourceforge.net/...xamples/gps/...
> The first column is GPS time of week followed by error_N (m) error_E
> (m) error_UP (m) error_2D (m) error_3D (m).
>
> The project is still in the Alpha development stage. I'm looking for
> further design feedback on the software.
>
> What do you think of the target application? Batch/script files for
> generating plots+statistics directly to compressed bitmaps.
>
> Would you use this application and why/why not?
>
> What is lacking in the documentation?
>
> If you're keen, some review of the source is always appreciated.

Hi,
just give more examples as what I see is Voltage plot not GPS data.
My friend sdaid that since release of Googvle Earth, Google Maps there
is a little chance to develop any
commercial gps data visualization application.
You can convert your csv file to xml, than to kml and get data
visualized in GE or GM.
Look at Xtraceroute
http://www.dtek.chalmers.se/~d3august/xt/index.html

Darius
Finite State Machines
Indoor Navigation/ Surveillance / Identification Systems
LBS (location-based services) Navteq developer

Glenn MacGougan

2007-12-29, 3:33 pm

On Dec 29, 1:53 pm, Darius <dariusjack2...@yahoo.ie> wrote:
> On Dec 29, 6:42 pm, Glenn MacGougan <glenn.macgou...@gmail.com> wrote:
>
>
>
>
>
>
>
>
>
>
>
> Hi,
> just give more examples as what I see is Voltage plot not GPS data.
> My friend sdaid that since release of Googvle Earth, Google Maps there
> is a little chance to develop any
> commercial gps data visualization application.
> You can convert your csv file to xml, than to kml and get data
> visualized in GE or GM.
> Look at Xtraceroutehttp://www.dtek.chalmers.se/~d3august/xt/index.html
>
> Darius
> Finite State Machines
> Indoor Navigation/ Surveillance / Identification Systems
> LBS (location-based services) Navteq developer

The options file just needs to be configured a bit further. Check out
the GPS example in
https://plot2d.svn.sourceforge.net/...trunk/examples/

The example image is:
https://plot2d.svn.sourceforge.net/...sitionError.bmp

I agree for plotting the actual GPS data but this software is useful
for doing some numerical analysis.
The example I gave shows the errors with an RTK GPS solution over time.

Darius

2007-12-29, 10:33 pm

On Dec 29, 10:00 pm, Glenn MacGougan <glenn.macgou...@gmail.com>
wrote:
> On Dec 29, 1:53 pm, Darius <dariusjack2...@yahoo.ie> wrote:
>
>
>
>
>
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>
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> The options file just needs to be configured a bit further. Check out
> the GPS example inhttps://plot2d.svn.sourceforge.net/svnroot/plot2d/trunk/examples/
>
> The example image is:https://plot2d.svn.sourceforge.net/...xamples/gps/...
>
> I agree for plotting the actual GPS data but this software is useful
> for doing some numerical analysis.
> The example I gave shows the errors with an RTK GPS solution over time.

Thanks.
Please let me know what is a nature of position error at 18:50 ?
Does it work for any geoposition ?

Darius

Glenn MacGougan

2007-12-29, 10:33 pm

On Dec 29, 2:55 pm, Darius <dariusjack2...@yahoo.ie> wrote:
> On Dec 29, 10:00 pm, Glenn MacGougan <glenn.macgou...@gmail.com>
> wrote:
>
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> Thanks.
> Please let me know what is a nature of position error at 18:50 ?
> Does it work for any geoposition ?
>
> Darius

The position error is outside the window at 18:50 (refer the max/min).
Try changing the ylimits to see the rest of the data.

The position error is calculated with respect to a known reference
position in this case. The math for it can be found at
http://gnsstk.sourceforge.net/geode...7ec9c141a42b6d9

Position errors can be calculated with respect to known trajectories
as well, so yes it can work for any geoposition if you have a
reference solution of higher order magnitude (say from a GPS/INS
system).

Darius

2007-12-29, 10:33 pm

On Dec 30, 12:41 am, Glenn MacGougan <glenn.macgou...@gmail.com>
wrote:
> On Dec 29, 2:55 pm, Darius <dariusjack2...@yahoo.ie> wrote:
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> The position error is outside the window at 18:50 (refer the max/min).
> Try changing the ylimits to see the rest of the data.
>
> The position error is calculated with respect to a known reference
> position in this case. The math for it can be found athttp://gnsstk.sourceforge.net/geodesy_8h. html#b664109cc9edd99
427ec9c1...
>
> Position errors can be calculated with respect to known trajectories
> as well, so yes it can work for any geoposition if you have a
> reference solution of higher order magnitude (say from a GPS/INS
> system).

Thanks.
I just watched bitmap file so no chance for menu access
from https://plot2d.svn.sourceforge.net/...sitionError.bmp
Is your error correction algorithm already implemented into Sirf III
gps receivers ?
It would be nice to have 3D Earth visualization for a standard Sirf
III gps receiver vs. one running your error correction algorithm to
see regions most affected by error.

Darius

Glenn MacGougan

2007-12-29, 10:33 pm

On Dec 29, 5:35 pm, Darius <dariusjack2...@yahoo.ie> wrote:
> On Dec 30, 12:41 am, Glenn MacGougan <glenn.macgou...@gmail.com>
> wrote:
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> Thanks.
> I just watched bitmap file so no chance for menu access
> fromhttps://plot2d.svn.sourceforge.net/svnroot/plot2d/trunk/examples/gps/...
> Is your error correction algorithm already implemented into Sirf III
> gps receivers ?
> It would be nice to have 3D Earth visualization for a standard Sirf
> III gps receiver vs. one running your error correction algorithm to
> see regions most affected by error.
>
> Darius

It's not error correction unless the true path or location is known -
meaning it has to be surveyed already.
Sirf III is likely to use position correction and assistance from WiFi
in the near future though.

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