Does the input track data have to be WGS84?

[angelyix]

Hi, dear developer! I tried your example and I changed the input track to my data expressed by WGS84 coordinates as follows,

track=np.array([[104.02605, 30.62130], [104.02590, 30.62138], [104.02548, 30.62161], [104.02529, 30.62170], [104.02522, 30.62175]])
But an error was reported, I wonder the reason for this? By the way, how can I import the 'plot_html' package?