Re: [gpsd-users] [ANN]: A gpsd client that plot on world vector shoreline map

[Hamish]

Chen Wei wrote:
> The vector shoreline is from NOAA. A script that convert
> NOAA's binary format to sqlite database used by gpsd Navigator
> is also included.

(see also OpenCPN which uses the NOAA coastline dataset as a
basename too [maybe not the most recent version though])


> Screenshots:
> https://dl.dropbox.com/u/509097/screenshot/screenshot_4.png

Congratulations, but careful about reinventing the wheel. I know
it's fun, I've written a gpsd client plotter too, but e.g. the
distance ring on the screen-shot 4 should really be a bit pear
shaped if you follow the geodesic true great circle distance and
plot it on a mercator projection. You can find code to do that
calc in various places, e.g. the `geod` software from PROJ.4.
Also Gerald Evenden has a newer great circle program too AFAIR.


regards,
Hamish