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Learning Machine #9 - Conociendo a los archivos GPX.

Hola a todos, el día de hoy vamos a ver cómo es que funcionan los archivos GPX.
Hace poco tiempo, cansado de no hacer nada por la mañana, decidí que sería buena idea volver a hacer un poco de ejercicio. Correr no es una opcion por ahora, estoy tan fuera de forma que probablemente muera de un infarto al primer kilometro, pero no dejare que eso sea un impedimento, así que opte por hacer un recorrido en bicicleta.
Yo soy de esas persona a las que le gusta tener cuantificado todo, asi que si por ejemplo, decidiera correr, necesitaria algo para medir los pasos y en el caso de la bicicleta, algo para medir la distancia.
Una de las maneras más sencillas para hacerlo, es usar mi telefono, al disponer de tantos sensores, debia de haber uno que me ayudara en lo que queria hacer. El GPS que tiene integrado, ayuda a obtener las coordenadas del trayecto.
Actualmente existen muchas aplicaciones que sirven para medir la distancia, velocidad y altitud de un trayecto, la mayoria de las aplicaciones que probé, guardaban toda la informacion en un archivo de extension *.GPX.

Los archivos GPX.

GPX, o GPS eXchange Format (Formato de Intercambio GPS) es un esquema XML pensado para transferir datos GPS entre aplicaciones. Se puede usar para describir puntos (waypoints), recorridos (tracks), y rutas (routes). (Wikipedia/GPX)
En resumidas cuentas, un archivo GPX es solamente un archivo XML en el cual se guardan los datos que se obtienen del GPS (u otras fuentes), pero ¿cómo saber que etiquetas se deben de usar? Bueno, las mas importantes (y que usaremos en futuros proyectos) son las siguientes:

  • <gpx> Indica el inicio del archivo, aqui se definen los esquemas a utilizar
    • <metadata> Indica el inicio de los meta datos.
      • <createtime> Fecha de creación.
      • <starttime> Fecha y hora de inicio del registro.
      •  <endtime> Fecha y hora del final del registro.
      • <distance> Distancia (en metros).
      • <duration> Duración del registro.
      • <maxspeed> Velocidad máxima (Km/h).
      • <avgspeed> Velocidad promedio (Km/h).
      • <vehicle> Tipo de vehículo.
      • <description> Descripción.
    • <trk> Indica el inicio de una pista.
    • <trkseg> Indica el inicio de un segmento de la pista.
    • <trkpt lat="00.0000000" lon="-00.0000000"> Un punto de la pista, cómo atributos se usa "lat" para almacenar la latitud y "lon" para almacenar la longitud.
    • <ele> Indica la elevación en este punto.
    • <speed> Indica la velocidad en este punto.
    • <currentdistance> Indica la distancia total actual.
    • <timeelapsed> Indica el tiempo transcurrido en este punto.
    • <time> Fecha y hora en la que se registro este punto.
Con lo anterior, entonces podemos crear un archivo cómo el que sigue:

<?xml version="1.0" encoding="UTF-8"?>
<gpx xmlns="http://www.topografix.com/GPX/1/1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.1" creator="Speed View GPS" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd">
   <metadata>
	  <createtime>2017-10-13T09:07:03Z</createtime>
	  <starttime>2017-10-13 08:32:23</starttime>
	  <endtime>2017-10-13 09:07:02</endtime>
	  <distance>7081.146</distance>
	  <duration>00:34:38</duration>
	  <maxspeed>7.91</maxspeed>
	  <avgspeed>3.406369</avgspeed>
	  <vehicle>car</vehicle>
	  <description>oct. 13, 2017 8:32:23</description>
   </metadata>
   <trk>
	  <trkseg>
		 <trkpt lat="19.2873547" lon="-98.9054489">
			<ele>2229.5</ele>
			<speed>4.17</speed>
			<currentdistance>4890.514</currentdistance>
			<timeelapsed>00:17:36</timeelapsed>
			<time>2017-10-13T08:49:59Z</time>
		 </trkpt>
		 <trkpt lat="19.2873004" lon="-98.9052929">
			<ele>2229.6</ele>
			<speed>4.68</speed>
			<currentdistance>4908.041</currentdistance>
			<timeelapsed>00:17:40</timeelapsed>
			<time>2017-10-13T08:50:03Z</time>
		 </trkpt>
		 <trkpt lat="19.2872414" lon="-98.9051528">
			<ele>2229.2</ele>
			<speed>5.6099997</speed>
			<currentdistance>4924.208</currentdistance>
			<timeelapsed>00:17:43</timeelapsed>
			<time>2017-10-13T08:50:06Z</time>
		 </trkpt>
		 <trkpt lat="19.2871614" lon="-98.9049907">
			<ele>2228.5</ele>
			<speed>6.16</speed>
			<currentdistance>4943.435</currentdistance>
			<timeelapsed>00:17:46</timeelapsed>
			<time>2017-10-13T08:50:09Z</time>
		 </trkpt>
		 <trkpt lat="19.2871065" lon="-98.9048134">
			<ele>2227.8</ele>
			<speed>6.6099997</speed>
			<currentdistance>4963.037</currentdistance>
			<timeelapsed>00:17:49</timeelapsed>
			<time>2017-10-13T08:50:12Z</time>
		 </trkpt>
		 <trkpt lat="19.2870293" lon="-98.9046317">
			<ele>2228.4</ele>
			<speed>6.8599997</speed>
			<currentdistance>4983.9917</currentdistance>
			<timeelapsed>00:17:52</timeelapsed>
			<time>2017-10-13T08:50:15Z</time>
		 </trkpt>
		 <trkpt lat="19.2869668" lon="-98.9044324">
			<ele>2229.5</ele>
			<speed>7.0699997</speed>
			<currentdistance>5006.054</currentdistance>
			<timeelapsed>00:17:55</timeelapsed>
			<time>2017-10-13T08:50:18Z</time>
		 </trkpt>
		 <trkpt lat="19.2868996" lon="-98.9042383">
			<ele>2229.0</ele>
			<speed>6.22</speed>
			<currentdistance>5027.7915</currentdistance>
			<timeelapsed>00:17:58</timeelapsed>
			<time>2017-10-13T08:50:21Z</time>
		 </trkpt>
		 <trkpt lat="19.2868314" lon="-98.9040744">
			<ele>2229.4</ele>
			<speed>5.42</speed>
			<currentdistance>5046.6025</currentdistance>
			<timeelapsed>00:18:01</timeelapsed>
			<time>2017-10-13T08:50:24Z</time>
		 </trkpt>
		 <trkpt lat="19.2867868" lon="-98.9039388">
			<ele>2229.3</ele>
			<speed>5.17</speed>
			<currentdistance>5061.6934</currentdistance>
			<timeelapsed>00:18:04</timeelapsed>
			<time>2017-10-13T08:50:27Z</time>
		 </trkpt>
		 <trkpt lat="19.2867203" lon="-98.9037992">
			<ele>2229.0</ele>
			<speed>5.42</speed>
			<currentdistance>5078.158</currentdistance>
			<timeelapsed>00:18:07</timeelapsed>
			<time>2017-10-13T08:50:30Z</time>
		 </trkpt>
		 <trkpt lat="19.2866701" lon="-98.9036398">
			<ele>2229.2</ele>
			<speed>5.75</speed>
			<currentdistance>5095.8345</currentdistance>
			<timeelapsed>00:18:10</timeelapsed>
			<time>2017-10-13T08:50:33Z</time>
		 </trkpt>
		 <trkpt lat="19.2866279" lon="-98.9035024">
			<ele>2229.4</ele>
			<speed>4.94</speed>
			<currentdistance>5111.036</currentdistance>
			<timeelapsed>00:18:13</timeelapsed>
			<time>2017-10-13T08:50:36Z</time>
		 </trkpt>
		 <trkpt lat="19.2865573" lon="-98.903338">
			<ele>2230.8</ele>
			<speed>5.35</speed>
			<currentdistance>5130.0107</currentdistance>
			<timeelapsed>00:18:17</timeelapsed>
			<time>2017-10-13T08:50:40Z</time>
		 </trkpt>
		 <trkpt lat="19.2865119" lon="-98.9031719">
			<ele>2232.1</ele>
			<speed>5.7</speed>
			<currentdistance>5148.191</currentdistance>
			<timeelapsed>00:18:20</timeelapsed>
			<time>2017-10-13T08:50:43Z</time>
		 </trkpt>
		 <trkpt lat="19.2864684" lon="-98.9030063">
			<ele>2231.6</ele>
			<speed>5.2999997</speed>
			<currentdistance>5166.3203</currentdistance>
			<timeelapsed>00:18:23</timeelapsed>
			<time>2017-10-13T08:50:46Z</time>
		 </trkpt>
		 <trkpt lat="19.2864122" lon="-98.9028658">
			<ele>2231.3</ele>
			<speed>4.96</speed>
			<currentdistance>5182.3594</currentdistance>
			<timeelapsed>00:18:26</timeelapsed>
			<time>2017-10-13T08:50:49Z</time>
		 </trkpt>
		 <trkpt lat="19.2863534" lon="-98.9026856">
			<ele>2231.1</ele>
			<speed>5.0899997</speed>
			<currentdistance>5202.404</currentdistance>
			<timeelapsed>00:18:30</timeelapsed>
			<time>2017-10-13T08:50:53Z</time>
		 </trkpt>
		 <trkpt lat="19.286309" lon="-98.9025323">
			<ele>2230.1</ele>
			<speed>5.73</speed>
			<currentdistance>5219.2666</currentdistance>
			<timeelapsed>00:18:33</timeelapsed>
			<time>2017-10-13T08:50:56Z</time>
		 </trkpt>
		 <trkpt lat="19.2862376" lon="-98.9023771">
			<ele>2230.8</ele>
			<speed>5.62</speed>
			<currentdistance>5237.3994</currentdistance>
			<timeelapsed>00:18:36</timeelapsed>
			<time>2017-10-13T08:50:59Z</time>
		 </trkpt>
		 <trkpt lat="19.286167" lon="-98.902229">
			<ele>2230.1</ele>
			<speed>5.7999997</speed>
			<currentdistance>5254.8184</currentdistance>
			<timeelapsed>00:18:39</timeelapsed>
			<time>2017-10-13T08:51:02Z</time>
		 </trkpt>
		 <trkpt lat="19.2861174" lon="-98.9020688">
			<ele>2229.7</ele>
			<speed>5.19</speed>
			<currentdistance>5272.635</currentdistance>
			<timeelapsed>00:18:42</timeelapsed>
			<time>2017-10-13T08:51:05Z</time>
		 </trkpt>
		 <trkpt lat="19.2860754" lon="-98.9019254">
			<ele>2229.5</ele>
			<speed>5.14</speed>
			<currentdistance>5288.4106</currentdistance>
			<timeelapsed>00:18:45</timeelapsed>
			<time>2017-10-13T08:51:08Z</time>
		 </trkpt>
		 <trkpt lat="19.2860339" lon="-98.9017654">
			<ele>2228.9</ele>
			<speed>4.89</speed>
			<currentdistance>5306.137</currentdistance>
			<timeelapsed>00:18:48</timeelapsed>
			<time>2017-10-13T08:51:11Z</time>
		 </trkpt>
		 <trkpt lat="19.2859513" lon="-98.9016034">
			<ele>2227.7</ele>
			<speed>4.52</speed>
			<currentdistance>5325.536</currentdistance>
			<timeelapsed>00:18:52</timeelapsed>
			<time>2017-10-13T08:51:15Z</time>
		 </trkpt>
		 <trkpt lat="19.285881" lon="-98.901449">
			<ele>2227.4</ele>
			<speed>4.81</speed>
			<currentdistance>5343.5986</currentdistance>
			<timeelapsed>00:18:56</timeelapsed>
			<time>2017-10-13T08:51:19Z</time>
		 </trkpt>
		 <trkpt lat="19.2858317" lon="-98.9013101">
			<ele>2228.0</ele>
			<speed>4.54</speed>
			<currentdistance>5359.328</currentdistance>
			<timeelapsed>00:18:59</timeelapsed>
			<time>2017-10-13T08:51:22Z</time>
		 </trkpt>
		 <trkpt lat="19.2857715" lon="-98.9011595">
			<ele>2228.3</ele>
			<speed>4.48</speed>
			<currentdistance>5376.5923</currentdistance>
			<timeelapsed>00:19:03</timeelapsed>
			<time>2017-10-13T08:51:26Z</time>
		 </trkpt>
		 <trkpt lat="19.2857089" lon="-98.9010114">
			<ele>2228.3</ele>
			<speed>4.35</speed>
			<currentdistance>5393.6396</currentdistance>
			<timeelapsed>00:19:07</timeelapsed>
			<time>2017-10-13T08:51:30Z</time>
		 </trkpt>
		 <trkpt lat="19.2856641" lon="-98.9008596">
			<ele>2228.6</ele>
			<speed>3.6799998</speed>
			<currentdistance>5410.394</currentdistance>
			<timeelapsed>00:19:11</timeelapsed>
			<time>2017-10-13T08:51:34Z</time>
		 </trkpt>
		 <trkpt lat="19.2855949" lon="-98.9006918">
			<ele>2228.4</ele>
			<speed>4.63</speed>
			<currentdistance>5429.6284</currentdistance>
			<timeelapsed>00:19:15</timeelapsed>
			<time>2017-10-13T08:51:38Z</time>
		 </trkpt>
		 <trkpt lat="19.2855428" lon="-98.9005373">
			<ele>2228.0</ele>
			<speed>4.48</speed>
			<currentdistance>5446.902</currentdistance>
			<timeelapsed>00:19:19</timeelapsed>
			<time>2017-10-13T08:51:42Z</time>
		 </trkpt>
		 <trkpt lat="19.2855065" lon="-98.9003938">
			<ele>2227.8</ele>
			<speed>5.7</speed>
			<currentdistance>5462.5405</currentdistance>
			<timeelapsed>00:19:22</timeelapsed>
			<time>2017-10-13T08:51:45Z</time>
		 </trkpt>
		 <trkpt lat="19.2854442" lon="-98.9002132">
			<ele>2227.5</ele>
			<speed>6.69</speed>
			<currentdistance>5482.7666</currentdistance>
			<timeelapsed>00:19:25</timeelapsed>
			<time>2017-10-13T08:51:48Z</time>
		 </trkpt>
		 <trkpt lat="19.2853641" lon="-98.9000407">
			<ele>2227.6</ele>
			<speed>6.8399997</speed>
			<currentdistance>5502.969</currentdistance>
			<timeelapsed>00:19:28</timeelapsed>
			<time>2017-10-13T08:51:51Z</time>
		 </trkpt>
		 <trkpt lat="19.2853049" lon="-98.8998464">
			<ele>2228.1</ele>
			<speed>6.7999997</speed>
			<currentdistance>5524.433</currentdistance>
			<timeelapsed>00:19:31</timeelapsed>
			<time>2017-10-13T08:51:54Z</time>
		 </trkpt>
		 <trkpt lat="19.2852443" lon="-98.8996762">
			<ele>2228.1</ele>
			<speed>6.25</speed>
			<currentdistance>5543.546</currentdistance>
			<timeelapsed>00:19:34</timeelapsed>
			<time>2017-10-13T08:51:57Z</time>
		 </trkpt>
		 <trkpt lat="19.2851887" lon="-98.8994991">
			<ele>2229.2</ele>
			<speed>6.6</speed>
			<currentdistance>5563.195</currentdistance>
			<timeelapsed>00:19:37</timeelapsed>
			<time>2017-10-13T08:52:00Z</time>
		 </trkpt>
		 <trkpt lat="19.2851245" lon="-98.8993265">
			<ele>2229.4</ele>
			<speed>6.25</speed>
			<currentdistance>5582.688</currentdistance>
			<timeelapsed>00:19:40</timeelapsed>
			<time>2017-10-13T08:52:03Z</time>
		 </trkpt>
		 <trkpt lat="19.2850556" lon="-98.8991673">
			<ele>2230.2</ele>
			<speed>6.44</speed>
			<currentdistance>5601.079</currentdistance>
			<timeelapsed>00:19:43</timeelapsed>
			<time>2017-10-13T08:52:06Z</time>
		 </trkpt>
		 <trkpt lat="19.2850039" lon="-98.8989882">
			<ele>2231.2</ele>
			<speed>6.43</speed>
			<currentdistance>5620.7734</currentdistance>
			<timeelapsed>00:19:46</timeelapsed>
			<time>2017-10-13T08:52:09Z</time>
		 </trkpt>
		 <trkpt lat="19.284942" lon="-98.8988195">
			<ele>2230.0</ele>
			<speed>6.42</speed>
			<currentdistance>5639.808</currentdistance>
			<timeelapsed>00:19:49</timeelapsed>
			<time>2017-10-13T08:52:12Z</time>
		 </trkpt>
		 <trkpt lat="19.2848768" lon="-98.8986502">
			<ele>2229.3</ele>
			<speed>6.33</speed>
			<currentdistance>5659.0356</currentdistance>
			<timeelapsed>00:19:52</timeelapsed>
			<time>2017-10-13T08:52:15Z</time>
		 </trkpt>
		 <trkpt lat="19.2848074" lon="-98.8984819">
			<ele>2228.3</ele>
			<speed>6.2999997</speed>
			<currentdistance>5678.3735</currentdistance>
			<timeelapsed>00:19:55</timeelapsed>
			<time>2017-10-13T08:52:18Z</time>
		 </trkpt>
		 <trkpt lat="19.2847355" lon="-98.8983052">
			<ele>2227.7</ele>
			<speed>6.24</speed>
			<currentdistance>5698.695</currentdistance>
			<timeelapsed>00:19:58</timeelapsed>
			<time>2017-10-13T08:52:21Z</time>
		 </trkpt>
		 <trkpt lat="19.2846779" lon="-98.8981337">
			<ele>2227.4</ele>
			<speed>6.24</speed>
			<currentdistance>5717.8203</currentdistance>
			<timeelapsed>00:20:01</timeelapsed>
			<time>2017-10-13T08:52:24Z</time>
		 </trkpt>
		 <trkpt lat="19.2846228" lon="-98.8979652">
			<ele>2227.3</ele>
			<speed>6.0899997</speed>
			<currentdistance>5736.634</currentdistance>
			<timeelapsed>00:20:04</timeelapsed>
			<time>2017-10-13T08:52:27Z</time>
		 </trkpt>
		 <trkpt lat="19.2845703" lon="-98.8978222">
			<ele>2228.1</ele>
			<speed>5.62</speed>
			<currentdistance>5752.7866</currentdistance>
			<timeelapsed>00:20:07</timeelapsed>
			<time>2017-10-13T08:52:30Z</time>
		 </trkpt>
		 <trkpt lat="19.2845295" lon="-98.8976665">
			<ele>2228.6</ele>
			<speed>5.0299997</speed>
			<currentdistance>5769.9194</currentdistance>
			<timeelapsed>00:20:10</timeelapsed>
			<time>2017-10-13T08:52:33Z</time>
		 </trkpt>
		 <trkpt lat="19.2844665" lon="-98.8974973">
			<ele>2228.4</ele>
			<speed>5.3199997</speed>
			<currentdistance>5789.093</currentdistance>
			<timeelapsed>00:20:14</timeelapsed>
			<time>2017-10-13T08:52:37Z</time>
		 </trkpt>
		 <trkpt lat="19.2844181" lon="-98.8973579">
			<ele>2228.4</ele>
			<speed>5.3199997</speed>
			<currentdistance>5804.718</currentdistance>
			<timeelapsed>00:20:17</timeelapsed>
			<time>2017-10-13T08:52:40Z</time>
		 </trkpt>
		 <trkpt lat="19.284345" lon="-98.8971953">
			<ele>2228.7</ele>
			<speed>5.46</speed>
			<currentdistance>5823.6953</currentdistance>
			<timeelapsed>00:20:20</timeelapsed>
			<time>2017-10-13T08:52:43Z</time>
		 </trkpt>
		 <trkpt lat="19.2843003" lon="-98.8970488">
			<ele>2228.7</ele>
			<speed>5.6099997</speed>
			<currentdistance>5839.8765</currentdistance>
			<timeelapsed>00:20:23</timeelapsed>
			<time>2017-10-13T08:52:46Z</time>
		 </trkpt>
		 <trkpt lat="19.2842265" lon="-98.8968865">
			<ele>2230.9</ele>
			<speed>5.7599998</speed>
			<currentdistance>5858.798</currentdistance>
			<timeelapsed>00:20:26</timeelapsed>
			<time>2017-10-13T08:52:49Z</time>
		 </trkpt>
		 <trkpt lat="19.2841685" lon="-98.8967161">
			<ele>2229.8</ele>
			<speed>5.7599998</speed>
			<currentdistance>5877.8633</currentdistance>
			<timeelapsed>00:20:29</timeelapsed>
			<time>2017-10-13T08:52:52Z</time>
		 </trkpt>
		 <trkpt lat="19.2840928" lon="-98.8965554">
			<ele>2230.3</ele>
			<speed>5.52</speed>
			<currentdistance>5896.795</currentdistance>
			<timeelapsed>00:20:32</timeelapsed>
			<time>2017-10-13T08:52:55Z</time>
		 </trkpt>
		 <trkpt lat="19.2840414" lon="-98.8964041">
			<ele>2230.1</ele>
			<speed>5.83</speed>
			<currentdistance>5913.686</currentdistance>
			<timeelapsed>00:20:35</timeelapsed>
			<time>2017-10-13T08:52:58Z</time>
		 </trkpt>
		 <trkpt lat="19.2839835" lon="-98.8962396">
			<ele>2230.4</ele>
			<speed>6.31</speed>
			<currentdistance>5932.1357</currentdistance>
			<timeelapsed>00:20:38</timeelapsed>
			<time>2017-10-13T08:53:01Z</time>
		 </trkpt>
		 <trkpt lat="19.2839417" lon="-98.8960511">
			<ele>2230.1</ele>
			<speed>5.81</speed>
			<currentdistance>5952.5576</currentdistance>
			<timeelapsed>00:20:41</timeelapsed>
			<time>2017-10-13T08:53:04Z</time>
		 </trkpt>
		 <trkpt lat="19.2838761" lon="-98.8958997">
			<ele>2230.2</ele>
			<speed>5.79</speed>
			<currentdistance>5970.072</currentdistance>
			<timeelapsed>00:20:44</timeelapsed>
			<time>2017-10-13T08:53:07Z</time>
		 </trkpt>
		 <trkpt lat="19.283805" lon="-98.8957721">
			<ele>2229.7</ele>
			<speed>5.31</speed>
			<currentdistance>5985.7344</currentdistance>
			<timeelapsed>00:20:47</timeelapsed>
			<time>2017-10-13T08:53:10Z</time>
		 </trkpt>
		 <trkpt lat="19.2837329" lon="-98.8956155">
			<ele>2228.8</ele>
			<speed>4.69</speed>
			<currentdistance>6004.08</currentdistance>
			<timeelapsed>00:20:51</timeelapsed>
			<time>2017-10-13T08:53:14Z</time>
		 </trkpt>
		 <trkpt lat="19.2836277" lon="-98.8955173">
			<ele>2229.0</ele>
			<speed>5.2599998</speed>
			<currentdistance>6019.7734</currentdistance>
			<timeelapsed>00:20:54</timeelapsed>
			<time>2017-10-13T08:53:17Z</time>
		 </trkpt>
		 <trkpt lat="19.2835321" lon="-98.8953833">
			<ele>2229.3</ele>
			<speed>5.47</speed>
			<currentdistance>6037.611</currentdistance>
			<timeelapsed>00:20:57</timeelapsed>
			<time>2017-10-13T08:53:20Z</time>
		 </trkpt>
		 <trkpt lat="19.2834933" lon="-98.8952368">
			<ele>2229.5</ele>
			<speed>5.35</speed>
			<currentdistance>6053.6636</currentdistance>
			<timeelapsed>00:21:00</timeelapsed>
			<time>2017-10-13T08:53:23Z</time>
		 </trkpt>
		 <trkpt lat="19.2834481" lon="-98.8950919">
			<ele>2228.7</ele>
			<speed>5.22</speed>
			<currentdistance>6069.696</currentdistance>
			<timeelapsed>00:21:03</timeelapsed>
			<time>2017-10-13T08:53:26Z</time>
		 </trkpt>
		 <trkpt lat="19.283385" lon="-98.8949165">
			<ele>2228.7</ele>
			<speed>4.7799997</speed>
			<currentdistance>6089.425</currentdistance>
			<timeelapsed>00:21:07</timeelapsed>
			<time>2017-10-13T08:53:30Z</time>
		 </trkpt>
		 <trkpt lat="19.2833551" lon="-98.8947334">
			<ele>2229.2</ele>
			<speed>4.8399997</speed>
			<currentdistance>6108.9653</currentdistance>
			<timeelapsed>00:21:11</timeelapsed>
			<time>2017-10-13T08:53:34Z</time>
		 </trkpt>
	  </trkseg>
   </trk>
</gpx>

Que tendrá cómo resultado algo cómo lo de la imagen siguiente:
Puedes ver el archivo GPX en http://maplorer.com/
No todos las etiquetas son necesarias para que el archivo funcione, pero por default la aplicación que use crea todas las etiquetas anteriores. Cómo eso se me hace un desperdicio, en el siguiente post, vamos ver cómo hacer uso del GPS en un dispositivo android (con GPS, obviamente) y crear nuestros propios archivos GPX para poder llevar un registro de los recorridos en bicicleta que haga.

Por ahora es todo, los leo luego.

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