I’m pleased to formally announce a new terrain tileset for use with Cesium and other applications: STK World Terrain!
STK World Terrain is a seamless mosaic built from a large and growing set of terrain data. It currently includes 10 meter resolution data for the United States, 30 meter data for Europe and Australia (both added just this week!), and 90 meter data for most of the rest of the world. With STK World Terrain, your Cesium application can have beautiful, high-resolution terrain right out of the box, just by adding a few of lines of code.
If you're already using the older Small Terrain tileset, you will find that this new tileset is higher-resolution and does a better job of preserving the shape of terrain features like cliffs and distant mountains. Perhaps more importantly, STK World Terrain is a living tileset; we will incorporate more and better data into it as time goes on. However, STK World Terrain does not yet include the water mask found in Small Terrain, so you should continue to use the older tileset for the time being if the fancy water effect is valuable for your application. We expect to include the water mask in a future version of STK World Terrain.