r.northerness.easterness

Calculation of northerness, easterness and the interaction between northerness and slope

r.northerness.easterness elevation=name [--verbose] [--quiet] [--qq] [--ui]

Example:

r.northerness.easterness elevation=name

grass.script.run_command("r.northerness.easterness", elevation, verbose=False, quiet=False, superquiet=False)

Example:

gs.run_command("r.northerness.easterness", elevation="name")

Parameters

Command linePython (grass.script)

elevation=name [required]
    Name of elevation raster map
--help
    Print usage summary
--verbose
    Verbose module output
--quiet
    Quiet module output
--qq
    Very quiet module output
--ui
    Force launching GUI dialog

elevation : str, required
    Name of elevation raster map
    Used as: input, raster, name
verbose: bool, optional
    Verbose module output
    Default: False
quiet: bool, optional
    Quiet module output
    Default: False
superquiet: bool, optional
    Very quiet module output
    Default: False

DESCRIPTION

r.northerness.easterness calculates northerness, easterness and the interaction between northerness and slope (northerness*slope). The user must specify the input elevation raster map.

NOTES

As aspect is a circular land-surface parameter, in ecology a sine or cosine transformation is often used to obtain a continuous gradient, stressing the north-south or east-west gradient (northness or eastness).

The GRASS GIS default aspect angles (cartesian) are converted to compass angles.

Calculated raster maps are:

northerness: cos(aspect)
easterness: sin(aspect)
interaction between northerness and slope: northerness*slope

The color of these raster maps are set to grey.

EXAMPLE

  # align region to DEM and habitat vector
  g.region -a raster=DEM align=DEM

  # run r.northerness.easterness
  r.northerness.easterness elevation=DEM

REFERENCES

Olaya, V. 2009. Basic Land-Surface Parameters. In: Hengl, T. & Reuter, H.I. (eds.) 2009. Geomorphometry. Concepts, Software, Applications. Developments in Soil Science, Volume 33. Elsevier.

AUTHOR

Helmut Kudrnovsky

SOURCE CODE

Available at: r.northerness.easterness source code (history)
Latest change: Friday Feb 21 10:10:05 2025 in commit 7d78fe3