location == Geometry Control File (.tgc)

command == Read GIS Z Line

description == Used to update topography within a model. Polylines are treated as breaklines in the model’s topography (with the breakline height or elevation varying along its length). This command has been superseded with the TGC commands:\n\tRead GIS GIS Z Shape\n\tThe template file and command only remain for the purpose of version backward compatibility.

wiki link == https://wiki.tuflow.com/TUFLOW_Empty_Files#TUFLOW_Geometry_Control_file_.28TGC.29

manual link == https://docs.tuflow.com/classic-hpc/manual/2026.0/TwoD-Domains-1.html#tab:tab-twoDZAttribute