[geojson-script] Transform geojson from GoPro video to gpx format, jq needed #geojson #gpx #garmin

geojson2gpx.sh

#!/bin/bash

paste <(jq '.geometry.coordinates[]' $1 -c | sed -r 's/\[|\]//g' \
        |sed -r 's/^([^,]+),([^,]+),.*/<trkpt lat="\2" lon="\1">/') \
      <(jq '.properties.AbsoluteUtcMicroSec[]' $1 \
        | sed -r 's/(.*)(.{3})$$/\1,\2/' \
        | xargs -I time date -d @time +"%Y-%m-%dT%H:%M:%S") |\
# If you want to keep points at the same seconds, comment out the next line
uniq -f3 |\
sed -r 's/\t(.*)/<time>\1<\/time><\/trkpt>/' |\
sed '1i \
    <?xml version="1.0" encoding="utf8"?>\
    <gpx xmlns=\"http:\/\/www.topografix.com\/GPX\/1\/1\" xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\" xmlns:gpxtpx=\"http:\/\/www.garmin.com\/xmlschemas\/TrackPointExtension\/v2\" xsi:schemaLocation=\"http:\/\/www.topografix.com\/GPX\/1\/1 http:\/\/www.topografix.com\/GPX\/1\/1\/gpx.xsd\">\
    <trk>\
    <name>$layer<\/name>\
    <trkseg>
    $a \
    <\/trkseg>\
    <\/trk>\
    <\/gpx>\
    '

test.geojson