[GIS] How to split a GPX track file into several files of N trackpoints each

Question

I have some GPX track files, each containing tracks with thousands of trackpoints.

I need to split those files into multiple ones, each with 500 (or more, accordingly) points each.

Unfortunately I cannot simplify those tracks, I really need to split them.

As long as I could find, gpsbabel isn't able to do so. I am open to use any tool either on Linux (preferably) or Windows as well.

Answer 1

Surprisingly it seems gpsbabel indeed can't do it. But at least it can help by first converting to csv. Then I split the result with Unix' split and convert back to gpx with gpsbabel. A similar strategy might work with PowerShell, but I don't know if it has a split equivalent. Here is the bash function I used:

splitTrack() {
    # $1 shall be the gpx file to split
    pfx="${1%.*}-"
    gpsbabel -i gpx -f "$1" -t -o csv -F - \
    | split -d -l 500 --additional-suffix=.csv - "$pfx"

    for f in "$pfx"*.csv; do
        fout=${f%.*}.gpx
        gpsbabel -i csv -f "$f" -x transform,trk=wpt -x nuketypes,waypoints \
                            -o gpx -F "$fout"
        rm "$f"
    done
}

EDIT: Added hint from comments about getting track points out instead of way points.