Table 1: SAGA modules to calculate terrain parameters.

Terrain parameterModule libraryModuleReferenceSaga author/year

AltitudeTerrain analysis—preprocessingFill sinks (Planchon/Darboux, 2001)[24] Wichmann/2003
Slope 
Aspect 
Profile curvature 
Plan curvature
Terrain analysis—morphometrySlope, aspect, curvature[25] Conrad/2001
Convergence indexTerrain analysis—morphometryConvergence index (search radius)[26] Conrad/2003
Normalised height 
Valley depth
Terrain analysis—morphometryRelative heights and 
Slope positions
Böhner and  Conrad/2008
TRITerrain analysis—morphometryTerrain ruggedness index[27] Conrad/2010
Wind effectTerrain analysis—morphometryWind effectBöhner and Ringeler/2008, Conrad/2011
KRAA 
KRAS
Terrain analysis—hydrologyCatchment area 
(flow tracing)
[28] Conrad/2001
SWITerrain analysis—hydrologySaga wetness index[29] Böhner and Conrad/2001
PISRTerrain analysis—lighting, visibilityPotential incoming solar radiation—direct insolation[3032] Conrad/2010