From ba8adbd905b3b1b9378c9e1958cfff4f0bb27c15 Mon Sep 17 00:00:00 2001
From: typebrook <typebrook@gmail.com>
Date: Wed, 4 Dec 2019 09:13:00 +0800
Subject: update

---
 scripts/match.sh | 44 +++++++++++++++++++++++++++++++++-----------
 1 file changed, 33 insertions(+), 11 deletions(-)

(limited to 'scripts/match.sh')

diff --git a/scripts/match.sh b/scripts/match.sh
index a1c7e62..135fc81 100755
--- a/scripts/match.sh
+++ b/scripts/match.sh
@@ -1,12 +1,28 @@
-#! /bin/bash
+#!/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.sh raw.gpx > new.gpx
+#
+# Hint:
+#
+# Remember to put Mapbox Access Token at the top!
 
 #set -x
 set -e
 
-ACCESS_TOKEN=$(cat ~/settings/tokens/mapbox)
-LIMIT=10
+ACCESS_TOKEN=$(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
+MATCHED=/tmp/matched
 
 # store data of time and location into tmp file with 2 columns, format is like:
 # 1970-01-01T08:00:46 [121.0179739,14.5515336]
@@ -16,30 +32,36 @@ paste -d' ' \
     <(sed -nr 's/.*lat=\"([^\"]+)\".*/\1/p' $1) |\
 sed -r 's/ ([^ ]+) ([^ ]+)/ [\1,\2]/' |\
 awk '!_[$1]++' > $ORIGIN_DATA
-exit 0
 
+# 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 $ORIGIN_DATA | cut -d' ' -f1 | jq -nR '[inputs]') |\
-    curl -X POST -s --header "Content-Type:application/json" --data @- https://api.mapbox.com/matching/v4/mapbox.driving.json?access_token=$ACCESS_TOKEN > $RESPONSE
+    # Mapbox Map Matching API
+    curl -X POST -s  --data @- --header "Content-Type:application/json" https://api.mapbox.com/matching/v4/mapbox.driving.json?access_token=$ACCESS_TOKEN > $RESPONSE
 
-    TIMESTAMP=0
+    # Put matched points and indices into tmp file
     paste -d' ' \
         <(jq -c '.features[0].properties.matchedPoints[]' $RESPONSE) \
         <(jq -c '.features[0].properties.indices[]' $RESPONSE | xargs -I{} echo {}+1 | bc | xargs -I{} sed -n {}p $ORIGIN_DATA | cut -d' ' -f1 | date -f - +%s) \
-    > matched
+    > $MATCHED
+
+    # For each coodinates from Map Matching API, add timestamp at the end and print it out to tty
     jq -c '.features[0].geometry.coordinates[]' $RESPONSE |\
     while read line
     do
-        TIMESTAMP=$(head -1 matched | cut -d' ' -f2)
-        (head -1 matched | grep -F $line && sed -i 1d matched) || echo $line $TIMESTAMP jojo
+        TIMESTAMP=$(head -1 $MATCHED | cut -d' ' -f2)
+        (head -1 $MATCHED | grep -F $line && sed -i 1d $MATCHED) || echo $line $TIMESTAMP jojo
     done |\
-    tee /dev/tty && rm matched
+    tee /dev/tty && rm $MATCHED
 
+    # 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\
@@ -54,4 +76,4 @@ sed "1i \
 \ \ \ \ <\/trkseg>\n\
   <\/trk>\n\
 <\/gpx>\n\
-    " | tee output.gpx
+    "
-- 
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