Site location data is inherited from ModelIT but can be changed in RadianceIES by clicking the ApLocate icon on the RadianceIES toolbar. This will open the ApLocate dialog where the location and simulation weather data can be changed. Note that the simulation weather file is only used if Climate Based Daylight Modelling (CBDM) is performed.
The same window can be opened from the Tools>ApLocate menu item, or by double-clicking on the location in the status bar at the bottom of the screen.