Bash script to copy Mapillary pictures from an iPhone, and update the EXIF data

mapillary2exif.sh

#!/bin/bash
# This bash script copies pictures from Mapillary folders stored on an iPhone
# then update the pictures EXIF data to get the GPS and timestamp
# written by Christian Quest - August 2016
# requires jq and exiftool, if missing: apt install jq exiftool
# tested on Ubuntu 16.04


# copy Mapillary internal json data (contains GPS info, and more)
rsync /run/user/1000/gvfs/afc*/com.mapillary.app/cameras/internal/ internal -a

# copy picture files without thumbnails and keep a list of newfiles
rsync /run/user/1000/gvfs/afc*/com.mapillary.app/20* ./ -av --exclude *thumb.jpg | grep jpg > newfiles

# for each new file, get GPS data from Mapillary json (using jq)
for f in `cat newfiles`; do
  # location of Mapillary json
  json=`echo $f | sed 's!^.*/!internal/!;s!jpg!json!'`

  # extract lat/lon/heading/precision from json using jq
  lat=`jq -r .MAPLatitude $json`
  lon=`jq -r .MAPLongitude $json`
  heading=`jq -r .MAPCompassHeading.TrueHeading $json`
  dop=`jq -r .MAPGPSAccuracyMeters $json`

  # heading is offset by 90° on my iPhone... fix that ;)
  heading=`echo "($heading+90)%360" | bc`

  # get date/time from picture filename
  time=`echo $json | sed 's!internal/...........!!;s!_....json$!!;s!_!:!g'`
  date=`echo $f | sed 's!^.*/!!;s!..............jpg!!;s!_!/!g'`

  # printout what we found...
  echo "$json : $lon $lat $heading $dop $date $time"

  # put these data back in the picture file EXIF data using exiftool
  exiftool $f \
	-P -q -overwrite_original \
	-GPSLatitude=$lat  -GPSLatitudeRef=N \
	-GPSLongitude=$lon -GPSLongitudeRef=E \
	-GPSImgDirection=$heading -GPSImgDirectionRef=T \
	-GPSHPositioningError=$dop \
        -GPSTimeStamp=$time -GPSDateStamp=$date -DateTimeOriginal="$date $time"
done