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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# usage: gegps [-i] [-d kmldir]
#
# Feed location data from a running GPSD to a Google Earth instance.
# The -d argument is the location of the Google Earth installation
# directory. If not specified, it defaults to the current directory.
#
# If you have the free (non-subscription) version, start by running with
# the -i option to drop a clue in the Google Earth installation directory,
# as 'Open_in_Google_Earth_RT_GPS.kml', then open that file in Places
# (File > Open...),
#
# The basic recipe is here:
# http://tjworld.net/wiki/Linux/Ubuntu/GoogleEarthPlusRealTimeGPS
#
# This code originally by Jaroslaw Zachwieja and a guy referring
# to himself/herself as TJ(http://tjworld.net)
# Modified by Chen Wei <weichen302@aol.com> for use with gpsd
# Cleaned up and adapted for the GPSD project by Eric S. Raymond.
import time, os, gps, getopt
import sys
KML_OPEN_IN_GE = '''\
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://earth.google.com/kml/2.2">
<NetworkLink>
<name>Realtime GPS</name>
<open>1</open>
<Link>
<href>Realtime_GPS.kml</href>
<refreshMode>onInterval</refreshMode>
</Link>
</NetworkLink>
</kml>
'''
def kmlize(tpv):
'''http://code.google.com/apis/kml/documentation/kmlreference.html
for official kml document'''
latitude = tpv['lat']
longitude = tpv['lon']
speed_in = tpv['speed'] # meter/second
speed = speed_in * gps.MPS_TO_KPH # Km/h
heading = int(round(tpv['track'], 0))
altitude = tpv['alt']
if speed < 1:
heading = 0
return """<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://earth.google.com/kml/2.0">
<Placemark>
<name>%s km/h,heading %s</name>
<description>Realtime GPS feeding</description>
<LookAt>
<longitude>%s</longitude>
<latitude>%s</latitude>
</LookAt>
<Point>
<coordinates>%s,%s,%s</coordinates>
</Point>
</Placemark>
</kml>""" % (speed,heading,longitude,latitude,longitude,latitude,altitude)
if __name__ == "__main__":
session = gps.gps()
session.stream(gps.WATCH_ENABLE)
kmldir = "."
initialize = False
(options, arguments) = getopt.getopt(sys.argv[1:], "d:i")
for (opt, arg) in options:
if opt == '-d':
kmldir = arg
elif opt == '-i':
initialize = True
if initialize:
f = open(os.path.join(kmldir, 'Open_in_Google_Earth_RT_GPS.kml'), 'w')
f.write(KML_OPEN_IN_GE)
f.close()
else:
try:
while True:
report = session.next()
if report['class'] == 'TPV':
f = open(os.path.join(kmldir, 'Realtime_GPS.kml'), 'w')
f.write(kmlize(report))
f.close()
except StopIteration:
pass
except KeyboardInterrupt:
print 'gegpsd stopped '
# end
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