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This .txt file is then accessed by the HTML file that displays the JavaScript Google map API. After the HTML file reads in the text file, it first splits the latitude and longitude coordinates by new line, “\n” to create an array. In this array, each index represents one coordinate, for example, [43.47036890733803,-80.5362815379075]. Then, the array is split again at commas, “,” to create a list of lists. In this example, the list contains 21 elements, and each element contains another two elements (latitude and longitude). Each coordinate in the array is parsed into a float, and two floats (one coordinate) is made into an object. Now, this array of objects were either used to loop through and create markers, or they were drawn on the map as a polyline. Properties of the polyline were set, such as the colour, opacity, and weight, and the flight path was set to the map. This simply connects each sequential coordinate from head to tail using a red line and displays the red line on the map.
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