Problem

Allow website users to enter four latitude and longitude coordinates.

Proposed Solution

Integrate Google Maps API, and add a click event handler, similar to:

• http://itouchmap.com/latlong.html
• http://stackoverflow.com/questions/2770421/how-retrieve-latitude-and-longitude-via-google-maps-api
• http://marcgrabanski.com/article/jquery-google-maps-tutorial-basics

The data would populate into a hidden form field.

Questions

• What other ways (besides <input type='text' ... />) outside of Google's API are available to solve the problem?
• How would you restrict the number of lat/long points the user can choose?
• Would using those coordinates violate Google's Terms of Service?

Thank you!