Simple script to convert the fit files of a garmin forerunner to gpx files.

fit2gpx.py

#!/usr/bin/env python


from fitparse import FitFile
import srtm
import xml.dom.minidom as minidom
import moment
import sys
import xml.etree.cElementTree as ET



def prettify(elem):
    """Return a pretty-printed XML string for the Element.
    """
    rough_string = ET.tostring(elem, 'utf-8')
    reparsed = minidom.parseString(rough_string)
    return reparsed.toprettyxml(indent="\t")
    
def print_record(record_data):
    if record_data.units:
        print " * %s: %s %s" % (
            record_data.name, record_data.value, record_data.units,
        )
    else:
        print " * %s: %s" % (record_data.name, record_data.value)


if len(sys.argv) != 3:
	print sys.argv[0]+" filename outputpath"
	sys.exit()

fitfile = FitFile(sys.argv[1])


factor =(180/pow(2.0,31))

elevation_data = srtm.get_data()
output_file=""


root = ET.Element("gpx")
root.set("xmlns","http://www.topografix.com/GPX/1/1")
root.set("version","1.1")


track = ET.SubElement(root, "trk")
segment=ET.SubElement(track, "trkseg")

for record in fitfile.get_messages('record'):

    longtitude=-999
    latitude=-999
    heart_rate=-999
    speed=-999
    timestamp=""
    elevation=-999
    for record_data in record:
        if record_data.name=="timestamp":
            timestamp=record_data.value
            continue
        if not (type(record_data.value) is int or type(record_data.value) is float):
            if not record_data.name=="cadence":
                print_record(record_data)
            continue
        if record_data.name == "position_lat":
            latitude=record_data.value*factor
            continue
        if record_data.name=="position_long":
            longtitude=record_data.value*factor
            continue
        if record_data.name=="heart_rate":
            heart_rate=record_data.value
            continue
        if record_data.name=="speed":
            speed=record_data.value
            continue
        if record_data.name=="altitude":
            elevation=record_data.value
            continue
        if record_data.name=="distance":
            continue
        print_record(record_data)

    if not( longtitude==-999 or latitude==-999):
        point=ET.SubElement(segment, "trkpt")
        point.set("lat",str(latitude))
        point.set("lon",str(longtitude))
        if not heart_rate==-999:
            ext=ET.SubElement(point,"extensions")
            bpm=ET.SubElement(ext,"heartrate")
            bpm.text=str(heart_rate)
        if not speed==-999:
            s=ET.SubElement(point, "speed")
            s.text=str(speed)
        altitude=ET.SubElement(point, "ele")
        if not elevation==-999:
            altitude.text=str(elevation)
        else:
            altitude.text=str(elevation_data.get_elevation(latitude, longtitude))
        if timestamp:
            m = moment.date(str(timestamp), "%Y-%m-%d %H:%M:%S")
            t=ET.SubElement(point, "time")
            t.text=str(m.format("YYYY-M-DTH:m:sZ"))
            output_file=str(m.format("YYYY-M-DTH:m:sZ"))
    
    
output_file=sys.argv[2]+"/"+output_file+".gpx"

f = open(output_file, 'w+')
f.write(prettify(root))
f.close()