fTerrA

Function to derive terrain attributes using SAGA GIS

Source

https://github.com/FLFgit/ScaleP/blob/master/functions/fTerrA.R

Parameter

• DEM.DIR -> directory containing digital elevation model (DEM)
• DEM -> name digital elevation model (DEM)
• DEM.FRM -> format of DEM file
• OUT.DIR -> directory containing result
• TA.PF -> prefix of resulting terrain attributes
• TCI=TRUE -> option: TCI calculation is TRUE
• P.CA1 -> minimal parameter (threshold of catchment area)
• P.CA2 -> maximum parameter (threshold of catchment area)
• P.CA3 -> number of calucation variants (threshold of catchment area)
• MBI=TRUE -> option: MBI calculation is TRUE
• P.MBI1 -> minimal parameter (transfer constant Tcurvature)
• P.MBI2 -> maximum parameter (transfer constant Tcurvature)
• P.MBI3 -> number of calucation variants (transfer constant Tcurvature)
• NH=TRUE -> option: NH calculation is TRUE
• P.NH1 -> minimal parameter (smoothing parameter T)
• P.NH2 -> maximal parameter (smoothing parameter T)
• P.NH3 -> number of calucation variants (smoothing parameter T)
• TPI=TRUE -> option: NH calculation is TRUE
• P.TPI1 -> minimum parameter (scale parameter)
• P.TPI2 -> maximum parameter (scale parameter)
• P.TPI3 -> number of calucation variants (scale parameter)

Result

• names_TA.txt -> conversion table of terrain attribute names and resulting raster files
• TA[1…n].sgrd -> names of resulting raster files using prefix TA.PF and file number