[Freegis-list] GPS/NMEA data processing

[Bernhard Reiter]

On Wed, Jun 09, 2004 at 06:32:56PM +0200, Nils Faerber wrote:
> After the quite lengthy but very informative thread about GPS/NMEA GIS
> data processing I thought I should share my findings with you. It is not
> much but at least something.

No, that is great! 

> I had a look at QGIS and Thuban now.
> QGIS and Thuban do even look quite similar and offer similar
> functionality - still not vector editing, i.e. you cannot modify the
> shapes, 

Jump probably can do more, but it does not avoid the Java trap
(http://www.fsf.org/philosophy/java-trap.html).
Also PostGIS might help with more complicated operations.

> but you can add annotations and export simple maps from imported shapes. 

The main point of an interactive geoviewer are the classification functions.
If you want to touch up nice printing maps, you should try the
experimental SVG writing support of Thuban (in CVS) and the Skencil
Thuban-Map-SVG reader. Skencil is a full blown vector drawing
application that will allow you to make nice maps and even work on
the polygons.

> QGIS add the functionality of plugins, one of them a GPS import plugin.

Thuban calls a plugin "Extension".

> Though this plugin did not work for me it pushed me into the right
> direction of looking for a filter to change GPS/NMEA tracks into shapes.
> After some research I found a small program called "gpstr2shp.c" which
> converts GPS track data into shape files. 

Good catch.
I did look into creating a Thuban "Plugin" using gpsbabel
which looks promissing, just needs a couple of hours work.

> This track data is not NMEA
> but a rather simple format. 

gpsbabel with GPSMAN format support might help you here directly.
Try to convert it into that.

	Bernhard

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