I am using Cesium version 1.38. I need to use Cesium in an offline setting so I am using the Cesium Terrain Builder and Cesium Terrain Server to build and serve up terrain data. Everything works great except the ocean elevation level is roughly 3km above sea-level creating a "Day After Tomorrow esque" Tidal wave effect all along the coast. (Pretty terrifying)
I downloaded the terrain data from usgs.gov 's Earth Explorer. I am using the GTOPO30 terrain set. I am using the provided TIFFS have NODATA for ocean. My question is how/where can I account for this lack of data? Does it need to be when I build the tilesets, when I server them up, or in cesium itself? A point in the right direction would be helpful.