how to use

download CDT KML file
upload KML file to gaiagps (use kml, because the CDT gpx file is only waypoints and gaiagps won't handle more than 1000 waypoints uploaded at a time)
download gps file that was converted by gaiagps
set up variables -> input gpx file name to the one just downloaded
set the wp_counter_limit -> 1000 ~ 100 miles, 500 ~ 50 miles, 100 ~ 10 miles, 50 ~ 5 miles
run all cells
to convert this to a route, open the output in a text editor, search and replace "trk" with "rte" and save it



In [1]:

    
# variables
filename = 'CDT_2017_track.gpx'
wp_counter_limit = 50
wp_counter = 0
file_counter = 0
f = open(filename,'r')
o = open('output.gpx', 'w+')
comparison_text = '</trkpt>\n'



In [2]:

    
# insert EOF information for a GPX file
# create a strung variable that has everything needed and return it
# it needs to have this at the end of each file:
# </trkpt>\n</trkseg>\n</trk>\n</gpx>
def file_tags(flag):
    global file_counter
    if flag == 'BOF':
        return '<?xml version="1.0" ?>\n<gpx creator="GaiaGPS" version="1.1" xmlns="http://www.topografix.com/GPX/1/1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd">\n<trk>\n<name>CDT ' + str(file_counter) + '</name>\n<desc>\n</desc>\n<trkseg>\n'
    elif flag == 'NT':
        if len(str(file_counter)) == 1:
            return '</trkseg>\n</trk>\n<trk>\n<name>CDT 00' + str(file_counter) + '</name>\n<desc></desc>\n<trkseg>\n'
        elif len(str(file_counter)) == 2:
            return '</trkseg>\n</trk>\n<trk>\n<name>CDT 0' + str(file_counter) + '</name>\n<desc></desc>\n<trkseg>\n'
        else:
            return '</trkseg>\n</trk>\n<trk>\n<name>CDT ' + str(file_counter) + '</name>\n<desc></desc>\n<trkseg>\n'
    elif flag == 'EOF':
        return '</trkseg>\n</trk>\n</gpx>\n'
    else:
        return 'fail'



In [3]:

    
# method for reading the next line and compare it to some text
def line_compare(f_next_line):
    if f_next_line == comparison_text:
        return 'true'
    elif f_next_line == '':
        return 'EOF'
    else:
        return 'false'



In [4]:

    
# function to increment to a new file and close the previous file
# get file name and save it as a variable
# close the file
# increment the file counter
# open a new file
# return the new file object

def new_track(out_file):
    out_file.write(file_tags('NT'))
    return out_file



In [5]:

    
# while the waypoint counter is less than the waypoint limit, do the following
# get the next line
# write a new line to the output file
# save the previous line variable for testing at the end of the program
# compare the new line to the comparison text
# evaulate the results: true = increment wp_counter, EOL breaks out of while loop and ends program, false does nothing
# check to see if the wp_limit has been reached
# if reached, close old, open new file AND reset the wp_counter to 0

while wp_counter < wp_counter_limit:
    f_string = f.readline()
    o.write(f_string)
    compare_result = line_compare(f_string)

    if compare_result == 'true':
        wp_counter += 1
    elif compare_result == 'EOF':
        break
    
    if wp_counter == (wp_counter_limit-1):
        file_counter += 1
        o = new_track(o)
        wp_counter = 0



In [6]:

    
o.close()
f.close()