transmition to "Terrain provider"!!!!!!

1. A concise explanation of the problem you’re experiencing.

I noticed that cesium transitioned to a paid service for the Terrain provider.
I am just wondering to know if there is any free version of ION or any free terrain providers?


2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

4. The Cesium version you’re using, your operating system and browser.

Hey Maryam,

ion terrain is free as long as you don’t exceed 15 GB per month (see and your app isn’t commercial. You can probably find a lot of free terrain data for local areas, but you’d still need to tile and host it somewhere. Cesium’s terrain tiles & streaming are pretty efficient so it only loads the areas you’re viewing.

What kind of project are you using it for?