The STK Esri Display Library allows developers to integrate Esri map documents and GIS functionality into custom STK X and STK Engine applications. It also allows for automation of GIS functionality in STK and manipulation of map documents from external scripts or applications.
Follow this link to enter the STK Esri Display Library
With this capability the STK rendering and animation engine can directly open and visualize Esri map documents. This is accomplished by embedding the ArcGIS Engine into the STK 3D capabilities. The Library is a thin wrapper on top of ArcObjects. It is functionally equivalent to the ArcGIS esriDisplay library, but for STK. It also exposes a few helper classes to facilitate configuration and manipulation of GIS data in the specifc context of STK and custom applications.
STK 11.2.1 Programming Interface