topidx: Calculation of the topographic index from a DEM raster
In RHydro: Classes and methods for hydrological modelling and analysis

Calculation of the topographic index from a DEM raster

1	topidx(DEM, res, river = NA)

`DEM`	A matrix representing a DEM with equally sized pixels and equal NS and EW resolution
`res`	Resolution of the DEM (m)
`river`	A matrix representing a river map (optional). All cells with values higher than 0 will be treated as river cells.

The river map should not contain negative values

The function returns a list, containing 2 rasters. Atb are the topographic index values of each grid cell. Area contains the contributing area

Wouter Buytaert, Imperial College London, based on routines developed by the hydrology group of Lancaster University

1
2
3

  data(huagrahuma.dem)
  #topidx <- topidx(huagrahuma.dem, resolution= 25)$atb
  #image(topidx)

RHydro documentation built on May 2, 2019, 6:24 p.m.

RHydro index

rdrr.io home R language documentation Run R code online

Note that we can't provide technical support on individual packages. You should contact the package authors for that.

Description