Is there a way to generate the swath/coverage area (possibly by outlining it by using a polyline or by creating a cone-like shape that connects the satellite to the globe) of a satellite using its 2-line element set?
If you know what the coverage should be, and want to visualize what is covered based on the geometry of the scene (so for example, taking into account other moving objects, the terrain/mountains etc.) the Analytics SDK, which is a commercial version of CesiumJS, has that ability you can read about here: https://cesium.com/ion-sdk/