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#!/usr/bin/env bash
#
# Author: Pham
#
# This script accepts a single GPX file as parameter and
# output the processed GPX body to STDOUT, using Mapbox Map Matching API v4.
# read doc at: https://docs.mapbox.com/api/legacy/map-matching-v4/
#
# Example:
#
# match-road.sh raw.gpx > new.gpx
#
# Hint:
#
# Remember to put Mapbox Access Token at the top!
#set -x
set -e
ACCESS_TOKEN=$(cat ~/settings/tokens/mapbox) # put yout Mapbox token here
LIMIT=10 # number of coordinates for each Mapbox Map Matching API request, Maximum value is 100
ORIGIN_DATA=/tmp/origin
RESPONSE=/tmp/response
# store data of time and location into tmp file with 2 columns, format is like:
# 1970-01-01T08:00:46 [121.0179739,14.5515336]
paste -d' ' \
<(sed -nr '/<trk>/,/<\/trk>/ { s/.*<time>(.*)<\/time>/\1/p }' $1 | cut -d'.' -f1) \
<(sed -nr 's/.*lon=\"([^\"]+)\".*/\1/p' $1) \
<(sed -nr 's/.*lat=\"([^\"]+)\".*/\1/p' $1) |\
sed -r 's/ ([^ ]+) ([^ ]+)/ [\1,\2]/' |\
awk '!_[$1]++' > $ORIGIN_DATA
# Consume raw data with serveral request
while [ -s $ORIGIN_DATA ]
do
# Make GeoJSON object for request
jq --slurp '{type: "Feature", properties: {coordTimes: .[1]}, geometry: {type: "LineString", coordinates: .[0]}}' \
<(head -$LIMIT $ORIGIN_DATA | cut -d' ' -f2 | jq -n '[inputs]') \
<(head -$LIMIT $ORIGIN_DATA | cut -d' ' -f1 | jq -nR '[inputs]') |\
# Mapbox Map Matching API, store response into tmp file
curl -X POST -s --data @- --header "Content-Type:application/json" https://api.mapbox.com/matching/v4/mapbox.driving.json?access_token=$ACCESS_TOKEN > $RESPONSE
# Put existing timestamp to matched points, and interpolate new timestamp into new points
join -a1 \
<(jq -c '.features[0].geometry.coordinates[]' $RESPONSE) \
<(jq -cr '.features[0].properties | [.matchedPoints, .indices] | transpose[] | "\(.[0]) \(.[1])"' $RESPONSE) |\
awk '{COOR[NR][0]=$1; N++; if(NF>1) COOR[NR][1]=$2; else COOR[NR][1]=-1} END{for (i=1; i<=N; i++) {printf COOR[i][0]; if (COOR[i][1] != -1) {print " "COOR[i][1]; LAST=i} else {while(COOR[i+n][1] == -1) n++; print " "COOR[LAST][1]+(COOR[i+n][1]-COOR[LAST][1])*(i-LAST)/(i+n-LAST)}}}' |\
while read coor unix_time
do
# Trasform unix timestamp into human readable time format, like following:
# Transform [121.018088,14.5516] 18.50
# Into [121.018088,14.5516] 1970-01-01T08:00:18.50Z
echo $coor $(date -d @$unix_time +'%Y-%m-%dT%H:%M:%S.%2NZ')
done | tee /dev/tty
# Remove processed raw data
sed -i "1,$LIMIT d" $ORIGIN_DATA
done |\
# Make GPX format for output
sed -r 's/\[([^,]+),([^,]+)\] ?(.*)/ <trkpt lon="\1" lat="\2"><time>\3<\/time><\/trkpt>/' |\
sed "1i \
<gpx version=\"1.1\" creator=\"Garmin Connect\"\n\
xsi:schemaLocation=\"http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd http://www.garmin.com/xmlschemas/GpxExtensions/v3 http://www.garmin.com/xmlschemas/GpxExtensionsv3.xsd http://www.garmin.com/xmlschemas/TrackPointExtension/v1 http://www.garmin.com/xmlschemas/TrackPointExtensionv1.xsd\"\n\
xmlns=\"http://www.topografix.com/GPX/1/1\"\n\
xmlns:gpxtpx=\"http://www.garmin.com/xmlschemas/TrackPointExtension/v1\"\n\
xmlns:gpxx=\"http://www.garmin.com/xmlschemas/GpxExtensions/v3\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\">\n\
<trk>\n\
<name>$(sed -nr 's/.*<name>(.*)<\/name>.*/\1/p; /<name>/q' $1)<\/name>\n\
<trkseg>
\$a \
\ \ \ \ <\/trkseg>\n\
<\/trk>\n\
<\/gpx>\n\
"
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