kml2gpx.py

import sys
import xml.etree.ElementTree as etree

def main():
    assert len(sys.argv) >= 2

    filename = sys.argv[1]

    # This translates the Google Maps symbol codes
    # to Garmin symbol codes. I have determined that
    # Garmin's codes are more readable.
    iconmaps = {
        '#icon-1417': 'Airport',
        '#icon-1385': 'Tall Tower',
        '#icon-1461': 'Car',        # metro
        '#icon-1037': 'Church',     # shrine
        '#icon-1107': 'Museum',
        '#icon-1445': 'Museum',
        '#icon-1363': 'Marina',
        '#icon-1363': 'Marina',
        '#icon-979':  'Bar',
        '#icon-1193': 'Park',
        '#icon-1021': 'Park',
        '#icon-1095': 'Shopping Center',
        '#icon-991':  'Restaurant',
        '#icon-1075': 'Restaurant',
        '#icon-1085': 'Restaurant',
        '#icon-1459': 'Car',        # train station
        '#icon-1113': 'Geocache',   # interesting place
        '#icon-1053': 'Geocache',   # interesting place
        '#icon-1405': 'Geocache',   # interesting place
        '#icon-1035': 'Residence',
        '#icon-960-DB4436': 'Residence',
        '#icon-960-62AF44': 'Green Diamond',
    }

    waypoints = []
    alllat = []
    alllon = []
    tree = etree.parse(filename)
    root = tree.getroot()

    placemark_nodes = root.find('{http://www.opengis.net/kml/2.2}Document').findall('{http://www.opengis.net/kml/2.2}Placemark')

    # For each placemark in Google Maps,
    # we will map the name, lat, lon, and symbol to something
    # that will work on my Garmin GPS device
    for pm in placemark_nodes:
        point = pm.find("{http://www.opengis.net/kml/2.2}Point")

        if point is not None:
            coordinates = point.find("{http://www.opengis.net/kml/2.2}coordinates").text
            [lon, lat, elev] = coordinates.split(",")

            thiswp = {}
            name = pm.find("{http://www.opengis.net/kml/2.2}name").text.encode('ascii', 'ignore')
            name = name.strip()

            thiswp['name'] = name
            thiswp['lat'] = float(lat)
            thiswp['lon'] = float(lon)
            original_icon = pm.find("{http://www.opengis.net/kml/2.2}styleUrl").text
            if original_icon in iconmaps:
                thiswp['symbol'] = iconmaps[original_icon]
            else:
                print "Find icon for ",thiswp['name'], original_icon
            waypoints.append(thiswp)

            alllat.append( float(lat) )
            alllon.append( float(lon) )

    # Now that we have our waypoints in a workable form, write this to the screen.
    print """<?xml version="1.0" encoding="UTF-8"?>
<gpx xmlns="http://www.topografix.com/GPX/1/1" version="1.1" creator="EasyGPS 4.92" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:gpxtrx="http://www.garmin.com/xmlschemas/GpxExtensions/v3" xmlns:gpxx="http://www.garmin.com/xmlschemas/GpxExtensions/v3" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd http://www.topografix.com/GPX/gpx_style/0/2 http://www.topografix.com/GPX/gpx_style/0/2/gpx_style.xsd http://www.topografix.com/GPX/gpx_overlay/0/3 http://www.topografix.com/GPX/gpx_overlay/0/3/gpx_overlay.xsd http://www.topografix.com/GPX/gpx_modified/0/1 http://www.topografix.com/GPX/gpx_modified/0/1/gpx_modified.xsd http://www.topografix.com/GPX/Private/TopoGrafix/0/4 http://www.topografix.com/GPX/Private/TopoGrafix/0/4/topografix.xsd http://www.garmin.com/xmlschemas/GpxExtensions/v3 http://www.garmin.com/xmlschemas/GpxExtensionsv3.xsd http://www.garmin.com/xmlschemas/GpxExtensions/v3 http://www.garmin.com/xmlschemas/GpxExtensionsv3.xsd">
<metadata>
<bounds minlat="%s" minlon="%s" maxlat="%s" maxlon="%s"/>
<extensions>
<time xmlns="http://www.topografix.com/GPX/gpx_modified/0/1">2013-06-02T02:57:10.274Z</time>
</extensions>
</metadata>
""" % (min(alllat), min(alllon), max(alllat), max(alllon))

    gpxtemplate = """<wpt lat="%s" lon="%s">
<ele>0</ele>
<name>%s</name>
<sym>%s</sym>
<type>%s</type>
<type>Locale</type>
<extensions>
<label xmlns="http://www.topografix.com/GPX/gpx_overlay/0/3">
<label_text>%s</label_text>
</label>
</extensions>
</wpt>
"""

    for wp in waypoints:
        print gpxtemplate % (wp['lat'], wp['lon'], wp['name'], wp['symbol'], wp['symbol'], wp['name'])

    print "</gpx>"

    return 0

if __name__=='__main__':
    sys.exit(main())