Use this google page: https://google-developers.appspot.com/maps/documentation/javascript/examples/full/rectangle-event Then draw the rectangle and use the popup information to copy paste the lon/lat into the config.json **Example:** <img width="512" alt="screen shot 2016-08-12 at 20 25 16" src="https://cloud.githubusercontent.com/assets/11859271/17632869/e90dd0a2-60ca-11e6-9a49-443c082f4a1a.png">
Use this google page: https://google-developers.appspot.com/maps/documentation/javascript/examples/full/rectangle-event
Then draw the rectangle and use the popup information to copy paste the lon/lat into the config.json
Example: