# Slope Area Combination

(c) 2010 by David G. Tarboton
Creates a grid of slope-area values = `(Sm) (An)` based on slope and specific catchment area grid inputs, and parameters `m` and `n`. This tool is intended for use as part of the slope-area stream raster delineation method.

## Parameters

Number of Processes
Integer
  The number of stripes that the domain will be divided into and the number of MPI parallel processes that will be spawned to evaluate each of the stripes.
Slope Grid
Raster Grid
  This input is a grid of slope values. This grid can be obtained from the "D-Infinity Flow Directions" tool.
Area Grid
Raster Grid
  A grid giving the specific catchment area for each cell taken as its own contribution (grid cell length or summation of weights) plus the proportional contribution from upslope neighbors that drain in to it. This grid is typically obtained from the "D-Infinity Contributing Area" tool.
Slope Exponent
Double
  The slope exponent (`m`) parameter which will be used in the formula: `(Sm)(An)`, that is used to create the slope-area grid. Default value 2.
Area Exponent
Double
  The area exponent (`n`) parameter which will be used in the formula: `(Sm)(An)`, that is used to create the slope-area grid. Default is 1.

## Outputs

Slope Area Grid
Raster Grid
  A grid of slope-area values = `(Sm)(An)` calculated from the slope grid, specific catchment area grid, `m` slope exponent parameter, and `n` area exponent parameter.