[Openstreetmap] contour rings from GPX

[Christian Nold]

Hi a bit off topic but I would love some help!

I have a large number of GPX files that I would like to use for creating filled contour rings of an area.

Ideally I would like to use the files as they are and not have to
convert them to X,Y,Z and it would be fantastic if I could export the
contours as vectors.

Could somebody please recommend me some easy to use - open
source/freeware (windows) programs that could do this?

Any help would be really appreciated!

-- 
Thanks
 Christian 


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