How to export Google Maps' MyMaps data in full?

[Jubal Kessler]

I wish to build a set of shapes.txt entries for a given bus route.
I've created a faithful "line" shape in Google Maps via its MyMaps
feature, with appropriate latitude and longitude coordinates. The
problem is that I cannot yet find a way to export these coordinates
from Google Maps, or otherwise obtain them.

Is there a way to access this data in full, by any means? I don't care
in what format, as long as the lat/lon coordinates are present and in
the correct sequence. I can massage the data into the expected format
for shapes.txt, but first I need to obtain it.

I've "exported" the MyMaps data as a Google Earth KML file, but when I
look inside this file, it consists of a single URL to Google Maps
rather than a set of coordinates. I do not know if it is possible to
obtain the line data from within Google Maps. Is it? If so, how would
I go about doing this?

Thanks for any assistance.

[Devin Braun]

Hi Jubal,

This isn't currently "supported" (which means it could go away at any
time), but paste the url of the MyMap that you've created in your
browser and add &output=kml to the end of it. You'll get a KML file
with the coordinates of the route you're working on.

Devin Braun
San Diego MTS