How to get terrain height offline mode

Hi,
I have a issue on getting the height data offline mode.
I am able to get the height from terrain provider with online but.
I need to get it offline mode. So, how can I solve this?
Thanks

Hi there,

You’ll need access to an offline terrain provider.

Cesium has a few paid options for this. If you are interested, contact sales@cesium.com.

Otherwise, you will need to find another service which locally serves terrain data in the quantized mesh or heightmap format.

Thanks,
Gabby

You can check out here

https://portal.terrainserver.com