Thanks for the reply, Stephan (and thanks for all your TT software, I'm using a lot of it :) )
I am not a coder, so I can barely understand what that c code says :P
it looks like the about 700 static values in the array could be a good approximation, way better then the fixed value I was proposing.
Are you planning to implement something like that in Height?

For the time being, I found gpsbabel has an option to fix the gpx files directly[1], but having the corrected files coming out directly from TT would be more elegant, IMHO :)

[1] http://www.gpsbabel.org/htmldoc-development/filter_height.html


On 30/12/2009 09:50, [email protected] wrote:
Hi Ulisse,

I don't think to a system that calculates the correction basing on the
GPS coords, it would be too much work for the tiny TT processor.

Not really, there are pieces of code out there that can do it
approximately, and fast, like "geoid.c" of the "gpsd"-package.

Have a look:
http://www.sfr-fresh.com/linux/misc/gpsd-2.90.tar.gz:a/gpsd-2.90/geoid.c

Best Regards and a Happy New Year!
Stephan aka Joghurt



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