[Qgis-user] QGIS Live GPS Tracking Settings (QGIS 2.14)

[Brent Wood]

Hi Malhar,


I'm currently looking to fund a QGIS developer to add the ability to (optionally) save the GPS timestamp along with the point feature.


If you also have work you'd like done in the GPS panel, I think we could perhaps save costs by collaborating on a single upgrade for all our desired functionality? Please contact me if you are interested.




Note that you can sort of achieve your goals by recording the GPS data directly into a database (rather than a shapefile or non-RDBMS dataset). Then plot the data from this table instead of using the live GPS display.


You can then open a layer which has a SQL something like:


select * from table where timestamp > now - interval('10 minutes');


Then use the capability described here for that layer: https://github.com/qgis/QGIS-Documentation/issues/1683

This gives you the last 10 minutes data - or any interval you want, refreshed automatically as required



To use an SVG symbol such as an airplane for the current position, you can create a new point layer with a query like:

select * from table where timestamp = (select max(timestamp) from table);

This will always return just the latest point feature... and if the timestamp is indexed, it can do it pretty quickly.
Assign a suitable airplane symbol to the layer and set this layer also to redraw automatically.

Then assign the label for this point layer to be built up as a string with deg/dec min, then the latest position will always be written on the map in the format you want.


This would work with any of the 3 main open source spatial SQL databases (Postgis, MySQL/MariaDB/Spatialite) as it uses very standard SQL statements. I have done similar things in the past  with Postgis & Spatialite.


A lot of these sorts of issues can be treated as layers plotting subsets of data filtered & reformatted as required - so they become data management problems rather than live GPS data problems, and normal database functionality can be used to provide the required capabilities.



Hope this helps!!

Brent Wood

Programme leader: Environmental Information Delivery
NIWA
DDI:  +64 (4) 3860529


[cid:image23e6c9.PNG at 6908ca10.46bab324]<http://www.niwa.co.nz>


Brent Wood
Principal Technician - GIS and Spatial Data Management
Programme Leader - Environmental Information Delivery
T +64-4-386-0529

National Institute of Water & Atmospheric Research Ltd (NIWA)
301 Evans Bay Parade, Greta Point, Wellington
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________________________________
From: Qgis-user <qgis-user-bounces at lists.osgeo.org> on behalf of Phil Wyatt <phil at wyatt-family.com>
Sent: Thursday, October 25, 2018 13:25
To: 'malhar'; qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] QGIS Live GPS Tracking Settings (QGIS 2.14)

Hi Malhar,

No, I don’t believe there are any ways to edit the GPS information as per your requests. If these features are a high priority for you then maybe consider supporting a developer to make some changes to the base code to allow changes to the GPS and the trail. I suspect Lat/Lon is the standard for most GPS’s but again a developer may be able to set options for other NMEA sentences.

Cheers - Phil

From: Qgis-user [mailto:qgis-user-bounces at lists.osgeo.org] On Behalf Of malhar
Sent: Wednesday, 24 October 2018 11:26 PM
To: qgis-user at lists.osgeo.org
Subject: [Qgis-user] QGIS Live GPS Tracking Settings (QGIS 2.14)

Hello all,

I am currently using the QGIS (2.14) live GPS tracker for a project. I have a few questions regarding the settings for the live tracking feature.

1) Is there a way to change the latitude and longitude units from decimal degrees to degrees and decimal minutes in the "GPS Information Panel?"

2) Is there a way to change the symbol of a cross within a circle to an airplane?

3) Is there a way to change the trail of the aircraft so it only shows the previous 10 minutes of flight, yet have the log file show the entire flight route?

Thank you very much for your help.

Sincerely,
Malhar



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