[ gpsdrive ] making use of AIS data

[Guenther Meyer]

Am Donnerstag 15 Januar 2009 schrieb Hamish:
> Doug wrote:
> > AIS targets (a hack of the friends tracker code perhaps),
>
> Guenther:
> >> are these targets static or moving ones?
>
> they are moving targets highly similar to friendsd blips.
> It is real-time position and speed+direction data for ships,
> which are typically traveling much faster than you are (so
> static representation is dangerous).
>
> if integrated into a NMEA stream with a multiplexer, we need to
> start parsing NMEA again.
not good.

> an alternative is to patch/add AIS 
> support into GPSD (a reoccurring request on their ML AFAICT).
>
maybe we can utilize something like http://gnuais.sourceforge.net/ for this?

> >> [...], I see two possibilites:
> >> - using a kind of friends server to provide the data
>
> yes please (or integrate it into/reuse friendsd display code)
>
I would prefer to integrate this separately but by reusing the friends code, 
so that one can choose not to compile in support for friends and ais 
separately.

> >> - having an external program, that gets those data from
> >>   somehwere, and inserts it into the gpsdrive database
> >>   temporarily
>
> mmmph, vulnerable to left-over cruft in the DB, etc., and relies
> on our timeout loop too much.  no thanks
>
this external tool would also have to take care of this, like gpsdrive already 
does for the friends data (can be optimized maybe).


> We don't need GDAL support for WMS. You can give enough data
> directly in the WMS request URL to form a nice gpsdrive backdrop
> tile. This is exactly what we do for the NASA LANDSAT downloads
> in Options->Maps->Downloads.
>
this is the current way...

> FWIW for the WMS raster driver in GDAL 1.5 and newer you create
> a small ~10 line XML file with the request details and it works
> from that.
>
...and that could be an interesting alternative in the future to support any 
wms server, that wants to be used by someone, and without including them all 
into the code.




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