How to have a flat terrain?

I use the terrain of Cesium, he has ups and downs, and the ups and downs are not accurate. I need a flat terrain. I want to upload a custom terrain. What format should I upload?

I saw that in Ion’s Stories, the “WGS84 Ellipsoid” terrain can be selected. How to use it in unreal?

In other words, how do I upload terrain data to Ion? Such as what format is needed…

Hi @Xiaoguang,

This page should help you with the formats required for terrain data: Tiler Data Types and Formats – Cesium

I’m looking in to your point about the WGS84 Ellipsoid - It would be helpful to be able to use that in Unreal, so I’ll get back to you if I learn anything on that front.