Select date/time range from Google Location History JSON, using jq

select-time-range-from-google-location-history.sh

#!/usr/bin/env bash

# First, download "Location History" from https://takeout.google.com/settings/takeout?hl=en&gl=EN&expflags
#    (fr: "Historique des positions" from https://takeout.google.com/settings/takeout?hl=fr&gl=FR&expflags)
#
# => Big "Location history.json" file that looks like that:
# 
# {
#   "locations": [
#     {  "timestampMs": "1546415889121" },
#     {  "timestampMs": "1546415725521" } 
#   ]
# }
# 
# Then, pick your date/time range:
#
START_TIME='2019-01-01T1:00:00Z'
END_TIME='2019-01-03T1:00:00Z'
#
# And generate a JSON file that only returns the location history for that range:
#
cat "Location History.json" | jq --arg s ${START_TIME} --arg e ${END_TIME} '
  [($s, $e) | fromdate] as $r |
    [ .locations[] |
      select(
        (.timestampMs|tonumber) >= ($r[0] * 1000) and
        (.timestampMs|tonumber) <= ($r[1] * 1000)
      )
    ]' > filtered-location-history.json
#
# Convert it to a simpler "journey" format:
# 
cat "filtered-location-history.json" | jq '[ .[] | {
  timestamp: .timestampMs|tonumber,
  lat: (.latitudeE7 / 10000000),
  lng: (.longitudeE7 / 10000000)
 } ]' > journey.json
#
# (you may require: $ brew install jq)
#
# Then, you can use that file to render your replay your journey on a map
# --> https://github.com/sebastianvirlan/maps-journey-replay/issues/1
#