neighborDirection: Calculation of the direction of every object to its neighbors

In ggRaver/Lslide: Functions for object-oriented image analysis in landslide science

Calculation of the direction of every object to its neighbors

Description

This function neighborDirection calculate the direction in degree to its surrounding neighbors or a selection

Usage

neighborDirection(spdf, col.name, modus = "nb", tol = 360,
  spdf.bb = NULL, sp.PoS = NULL, nb = NULL, bb = NULL, cores = 1,
  quiet = TRUE, ...)

Arguments

spdf	SpatialPolygonsDataFrame, or full path of a shapefile
col.name	column name for angles (in degree, N = 0, E = 90, S = 180, W = 270)
modus	"bb" for using a boundig box or "nb" for using object neighborhood nb. Modus bb returns data.frame based on spdf. Modus nb returns list based on nb.
tol	tolerance for select neighbor of specific range. Default: 360
spdf.bb	SpatialPolygonsDataFrame from which the bounding boxes are created
sp.PoS	SpatialPoints to which the direction is calculated. As standard they are calculated from spdf input. Default: NULL
nb	object neighborhood based on poly2nb, for modus "nb. Default: Null
bb	bounding box for modus "bb". Default: Null
cores	number of cores for parallel processing. Default: 1 (sequential)
quiet	no outputs in console. Default: TRUE

Value

In the case of modus nb a list is returned. If modus bb is set, a data.frame based on the input spdf is returned

Note

• SpatialPolygonsDataFrame input must have an ID field with unique numbers

ggRaver/Lslide documentation built on April 8, 2022, 7:14 a.m.