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'''
Convert a NMEA ascii log file into a GPX file
'''
import argparse
import datetime
import logging
import pathlib
import re
import xml.dom.minidom
log = logging.getLogger(__name__)
try:
import pynmea2
except ImportError:
import sys
import pathlib
p = pathlib.Path(__file__).parent.parent
sys.path.append(str(p))
log.info(sys.path)
import pynmea2
def main():
parser = argparse.ArgumentParser(formatter_class=argparse.RawDescriptionHelpFormatter)
parser.add_argument('nmea_file')
args = parser.parse_args()
nmea_file = pathlib.Path(args.nmea_file)
if m := re.match(r'^(\d{2})(\d{2})(\d{2})', nmea_file.name):
date = datetime.date(year=2000 + int(m.group(1)), month=int(m.group(2)), day=int(m.group(3)))
log.debug('date parsed from filename: %r', date)
else:
date = None
author = 'https://github.com/Knio/pynmea2'
doc = xml.dom.minidom.Document()
doc.appendChild(root := doc.createElement('gpx'))
root.setAttribute('xmlns', "http://www.topografix.com/GPX/1/1")
root.setAttribute('version', "1.1")
root.setAttribute('creator', author)
root.setAttribute('xmlns', "http://www.topografix.com/GPX/1/1")
root.setAttribute('xmlns:xsi', "http://www.w3.org/2001/XMLSchema-instance")
root.setAttribute('xsi:schemaLocation', "http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd")
root.appendChild(meta := doc.createElement('metadata'))
root.appendChild(trk := doc.createElement('trk'))
meta.appendChild(meta_name := doc.createElement('name'))
meta.appendChild(meta_author := doc.createElement('author'))
trk.appendChild(trk_name := doc.createElement('name'))
trk.appendChild(trkseg := doc.createElement('trkseg'))
meta_name.appendChild(doc.createTextNode(nmea_file.name))
trk_name. appendChild(doc.createTextNode(nmea_file.name))
meta_author.appendChild(author_link := doc.createElement('link'))
author_link.setAttribute('href', author)
author_link.appendChild(author_text := doc.createElement('text'))
author_link.appendChild(author_type := doc.createElement('type'))
author_text.appendChild(doc.createTextNode('Pynmea2'))
author_type.appendChild(doc.createTextNode('text/html'))
for line in open(args.nmea_file):
try:
msg = pynmea2.parse(line)
except Exception as e:
log.warning('Couldn\'t parse line: %r', e)
continue
if not (hasattr(msg, 'latitude') and hasattr(msg, 'longitude')):
continue
# if not hasattr(msg, 'altitude'):
# continue
trkseg.appendChild(trkpt := doc.createElement('trkpt'))
trkpt.setAttribute('lat', f'{msg.latitude:.6f}')
trkpt.setAttribute('lon', f'{msg.longitude:.6f}')
if hasattr(msg, 'altitude'):
trkpt.appendChild(ele := doc.createElement('ele'))
ele.appendChild(doc.createTextNode(f'{msg.altitude:.3f}'))
# TODO try msg.datetime
if date:
trkpt.appendChild(time := doc.createElement('time'))
dt = datetime.datetime.combine(date, msg.timestamp)
dts = dt.isoformat(timespec='milliseconds').replace('+00:00', 'Z')
time.appendChild(doc.createTextNode(dts))
xml_data = doc.toprettyxml(
indent=' ',
newl='\n',
encoding='utf8',
).decode('utf8')
print(xml_data)
if __name__ == '__main__':
logging.basicConfig(level=logging.DEBUG)
main()
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