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I am working on an application that uses javascript to display a map and a marker at some coordinates over the sea. I want the application to move that marker according a certain path but I want it to be stopped when it touches the land.

I am already able to show the map, move the marker and get the elevation, but it turns out that I must do a lot of calls to the elevation service to make sure the marker doesn't go on land.
I thought of asking once for each point on earth and save it to a file but... I am not confortable with that solution. ;-)

Would anyone have a suggestion on how to determine if the marker is still on water without performing all the calls to the elevation service that my tests had me to do ?

Would there be a way to download this data or another data source I could use to get a map of the sea floor ?

I don't need it to be real-time accurate, but just enough to know if, in average, there is 1 meter of water or 25 meters at a certain location.

Thanks for any help, Claude

ClaudeVernier
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  • http://stackoverflow.com/questions/9644452/verify-if-a-point-is-land-or-water-in-google-maps would probably be a good place to start. – not_a_bot May 06 '15 at 21:21

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