lengthWidthRatio: Length-Width-Ratio

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

Length-Width-Ratio

Description

This function calculates the length-width-ratio for SpatialPolygonsDataFrame objects. The length-width vectors for the ratio are computed by a principal component analysis according to YI & MARSHALL (2000)

Usage

lengthWidthRatio(spdf, cores = 1, quiet = TRUE)

Arguments

spdf	SpatialPolygonsDataFrame input
cores	number of cores for parallel processing. Default: 1 (sequential)
quiet	no outputs in console. Default: TRUE

Value

data.table containing the ID field and a column (ratio) with length-width-ratio

Note

• for the principal component analysis the princomp function is used

• SpatialPolygonsDataFrame input must have an ID field with unique numbers

• YI, W.& S. MARSHALL (2000): Principal component analysis in application to object orientation. Geo-spatial Information Science, 3(3), 76-78.

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