[Freegis-list] GPS data processing

[Bernhard Reiter]

On Mon, Jun 07, 2004 at 08:00:51PM +0200, Nils Faerber wrote:
> Am Mo, den 07.06.2004 schrieb Bernhard Reiter um 18:56:

> > > I am sorry but I can not.
> > > But this question seems to become a FAQ here and I am pretty sure that
> > > there are some experts here on the list that could give some hints.
> > Haven't had that impression lately.
> > At least not when looking at the questions.
> > It seems that there are several different questions.
> 
> Hmm... at least I recognised at least three questions that were centered
> around the idea of postprocessing GPS data - for which reason ever.

Okay, so we have got a) from below and part of c) already done.

> > > So why not start a small "Dummy's Guide To GPS GIS Processing"?
> > Because most people are not Dummies and I do not want to treat them 
> > as being one. ;)
> 
> Argl... noone wanted to call them such.
> But it is a common word nowadays to call the "getting started for
> newbies" guides "dummie's guides". It was just meant as a humorous
> expression and I really hope that I was not misunderstood.

No, it wasn't as you can see by my simley.
I always frown on those books, because of that strange titles.
More generally I encourage people to have more self confidence
and buy books that do not treat them as dummies, even if it is only
in the title.

> > > I would be willing to contribute as far as I can!
> > First processing steps for receiving GPS data is:
> >  	a) Get the raw data somehow.
> > 	b) (optional) correct it when using other references
> > 	c) Convert it into the right format.
> > 		If you have time information, you can create polygons (tracks)
> > 		Otherwise you have points.
> 
> Concerning the polygons I searched for some solution to create those
> from GPS data.
> In most cases you will have GPS tracks that could be converted to
> polygons - at least in theory. The trick is the "how-to" which I have
> not yet found.

Ah, now that question is a lot better, 
because it goes more to the point.
It seems that somebody should make a shapefile backend for gpsbabel
or OGR to convert some of the GPS formats in GIS formats.
Usually the textfiles are so simple that for real purposes
someone would write a small import script, e.g. using pyshapelib.

> Interestingly for example GRASS has a digitizer option for some misc
> graphics tablets but AFAIK no GPS data import. And I was also not able
> to find any tool to convert GPS track data of any form into something
> that some package like GRASS would be able to postprocess.

There once was s.in.gps, but I did not look up what happend to it.

> > Now you have a regular GIS layer and processing this further
> > would be a GIS course subject.
> > 
> > There is a FreeGIS Tutorial section about using two GPS applications.
> > It is in German:
> > 	http://www.freegis.org/freegis_tutorial/online/node132.html
> 
> OK, I'll have a look at that!

It does not contain this example, but your are right in that it should.
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