Re: [ gpsdrive ] Newbie question

[Hamish <hamish_nospam@yahoo.com>]

Hamish wrote:
> David wrote:
> > I have a list of all airports in Australia and have not tried using
> > the top_Australia.jpg image before.
> > 
> > When I load the map and show the waypoints they are not in the
> > correct position.
> > 
> > On the South East Coast (where I know where the airposts should be)
> > everything is too far west by several hundred km.
> > 
> > On the South West Coast everything is too far East.
> > 
> > As you move towards the equator things look much better.
> > 
> > Im not sure what this means.
> 
> it means we have to do more testing, unfortunately. I'm not sure if
> the input map scaling is bad, the gpsdrive rendering is bad or
> different that what I expected (Plate carrée), the airport data is of
> dubious quality, or what.
> 
> how close is your gps location on the australia map?
> 
> probably need to turn on grid lines in gpsdrive-cvs version and I need
> to re-export the .au map from the GIS with embedded grid lines, then
> compare how they match up.  alternatively, make a grid of waypoints.
> 
> 
> how do the included continental maps look for everyone else?


I just exported a map of the Tasman Sea from the GIS* with Dunedin, New
Zealand (me) in the bottom right corner of the image. Everything is
where it should be. I also cropped out the AU+NZ airports from the
FlightGear list and converted into gpsdrive way_*.txt format. They all
draw in the right place too. (see WA screenshot linked below)
[gpsdrive 2.09 on Debian/Stable (sarge), using official debian package]

[*] ie NASA Blue Marble 2002 + GRASS GIS + d.out.gpsdrive module


Some linked files, including the draft quality Tasman Sea GpsDrive
backdrop, the way_tasman_airports.txt file, and a screenshot of
correctly located airports over top_Australia.png:

   http://hamish.bowman.googlepages.com/gpsdrivefiles#tasman


"works for me"


Hamish
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