Yes, STK supports both streaming terrain and imagery with local data for use offline.Streaming Terrain:
Offline streaming of terrain can only be accomplished by purchasing the Geospatial Content Server (GCS). https://p.widencdn.net/6mo5ix/Geospatial-CS-Product-SpecsheetNote
: GCS encompasses functionality previously named "Terrain Server". This part of GCS allows you to ingest your raw terrain and then stream it efficiently as a quantized mesh.
The no cost alternative is to convert user provided raw terrain formats into a custom format
that renders terrain in 3D.Streaming Imagery:
Option 1: GCS comes with global 10 meter resolution Sentinel 2 imagery and can stream user provided imagery.
Option 2: Streaming imagery can be accomplished at no cost with the WMS / WMTS or ArcGIS Rest UI plugin.WMS / WMTS: http://help.agi.com/stk/11.0/index.htm#wms.htm?Highlight=wmsArcGIS Rest
If you would like to get a quote for GCS email email@example.com or firstname.lastname@example.org.