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@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-boun...@lists.osgeo.org> on behalf of Phil Wyatt
<p...@wyatt-family.com>
Sent: Thursday, October 25, 2018 13:25
To: 'malhar'; qgis-user@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-boun...@lists.osgeo.org] On Behalf Of malhar
Sent: Wednesday, 24 October 2018 11:26 PM
To: qgis-user@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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