[GIS] Generate KML file/url from Google Maps

Question

I created kml file from ArcMap and imported into my Google maps, it works. Not sure if you can open this URL:
https://www.google.com/maps/d/edit?mid=13TuHmGuW9nnE-8TACTfGLdDDf6o&ll=38.90133009121122%2C-77.01476049999996&z=12

Now I want to display my map using Java API and I used this code
https://developers.google.com/maps/documentation/javascript/kml
tweaked it a little bit, inserted my API_Key at the end of the script but the problem is

<script>
      var map;
      var src = 'https://myGoogleMapURL

should be with the .kml extension if I am not mistaken.
My question is, how do I generate kml file/url from my map URL mentioned above.
I tried adding &output=kml at the end of the Google map URL as some people suggested but it does not work.

Answer 1

You can download the data directly from MyMaps with this syntax

https://www.google.com/maps/d/u/0/kml?mid={MAP_ID}&forcekml=1

The MAP_ID is the ID in the URL when you've got the MyMap open,

eg. your map

https://www.google.com/maps/d/edit?mid=13TuHmGuW9nnE-8TACTfGLdDDf6o&ll=38.90133009121122%2C-77.01476049999996&z=12

will be...

https://www.google.com/maps/d/u/0/kml?mid=13TuHmGuW9nnE-8TACTfGLdDDf6o&forcekml=1

or adding to your Google Maps Javascript API. But there is a limit of 2mb data size for this.

    let my_url = 'https://www.google.com/maps/d/u/0/kml?mid={MAP_ID}&forcekml=1'

    let kmlLayer = new google.maps.KmlLayer(my_url, {
      suppressInfoWindows: true,
      preserveViewport: false,
      map: map
    });

    kmlLayer.addListener('click', function(event) {
      var content = event.featureData.infoWindowHtml;
      var testimonial = document.getElementById('capture');
      testimonial.innerHTML = content;
    });

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Take note of your sharing settings. This does expose your data publicly (If they have the link or even the ID) but that's whats needed to download the data directly