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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.
'''
# This code runs compatibly under Python 2 and 3.x for x >= 2.
# Preserve this property!
from __future__ import absolute_import, print_function, division
import getopt
import os
import socket # for socket.error
import sys
# pylint wants local modules last
try:
import gps
except ImportError as e:
sys.stderr.write(
"gegps: can't load Python gps libraries -- check PYTHONPATH.\n")
sys.stderr.write("%s\n" % e)
sys.exit(1)
gps_version = '3.19-dev'
if gps.__version__ != gps_version:
sys.stderr.write("gegps: ERROR: need gps module version %s, got %s\n" %
(gps_version, gps.__version__))
sys.exit(1)
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']
# not all TPV includes speed, like when acquiring fix
if 'speed' in tpv:
speed_in = tpv['speed'] # meter/second
speed = speed_in * gps.MPS_TO_KPH # Km/h
else:
speed = 0
# not all TPV includes heading, like when acquiring fix
if speed >= 1 and 'track' in tpv:
heading = int(round(tpv['track'], 0))
else:
heading = 0
# not all TPV includes altitude
# like ublox8 in fixed position (time) mode
if 'alt' in tpv:
altitude = tpv['alt']
else:
altitude = 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__":
def usage():
"Print usage and exit"
sys.stderr.write("usage: gegps: [-d] [-h] [-i] [-V]\n\n"
" -d directory Location of Google Earth\n"
" -h Print this help and exit\n"
" -i\n"
" -V Print version and exit\n")
sys.exit(0)
kmldir = "."
initialize = False
(options, arguments) = getopt.getopt(sys.argv[1:], "d:hiV")
for (opt, arg) in options:
if opt == '-d':
kmldir = arg
elif opt == '-h':
usage()
elif opt == '-i':
initialize = True
elif opt == '-V':
sys.stderr.write("gegps: Version %s\n" % gps_version)
sys.exit(0)
try:
session = gps.gps()
except socket.error:
sys.stderr.write("gegps: Could not connect to gpsd daemon\n")
sys.exit(1)
session.stream(gps.WATCH_ENABLE)
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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