GISillä
GISillä is a Finnish word that translates to "with GIS" or "using GIS". GIS refers to Geographic Information Systems, which are systems designed to capture, store, manipulate, analyze, manage, and present all types of geographically referenced data. Therefore, "GISillä" signifies the application or utilization of these powerful spatial analysis tools.
When someone mentions performing a task "GISillä", they are indicating that a geographic approach will be taken.