r.SDD

Results from the Standard Deviation Distance Calculator (calc_sdd) are stored in a list object. This object is required for the plot function (plot_sdd).

datasets

A collection of functions for computing centrographic
statistics (e.g., standard distance, standard deviation
ellipse, standard deviation box) for observations taken at
point locations. Separate plotting functions have been
developed for each measure. Users interested in writing results
to ESRI shapefiles can do so by using results from aspace
functions as inputs to the convert.to.shapefile and
write.shapefile functions in the shapefiles library. The aspace
library was originally conceived to aid in the analysis of
spatial patterns of travel behaviour (see Buliung and Remmel,
2008). Major changes in the current version include (1) removal
of dependencies on several external libraries (e.g., gpclib,
maptools, sp), (2) the separation of plotting and estimation
capabilities, (3) reduction in the number of functions, and (4)
expansion of analytical capabilities with additional functions
for descriptive analysis and visualization (e.g., standard
deviation box, centre of minimum distance, central feature).

Ron N Buliung

aspace

A collection of functions for estimating centrographic
statistics and computational geometries for spatial point
patterns

r.SDD function

The list object contains the following results:
  <dl>
	<dt>id</dt><dd>Identifier for the SDD estimation - it should be unique</dd> <dt>points</dt><dd>a simple two-column data frame (or matrix) containing x,y coordinates for a series of point locations.</dd> <dt>coordsSDD</dt><dd>coordsSDD value, coordinates of the SDD</dd> <dt>SDD</dt><dd>SDD value, radius of the SDD</dd> <dt>calccentre</dt><dd>Boolean: TRUE if mean centre is computed</dd> <dt>weighted</dt><dd>Boolean: TRUE if the weighted mean centre is to be used instead</dd> <dt>weights</dt><dd>Weights applied to point observations</dd> <dt>CENTRE.x</dt><dd>X-coordinate of the centre</dd> <dt>CENTRE.y</dt><dd>Y-coordinate of the centre</dd> <dt>SDD.area</dt><dd>Area of the SDD circle</dd> </dl> 

Format

This demonstration data has been manufactured for illustrative purposes only.

r.SDD: Demo Data: Standard Deviation Distance Output Object

Description

Arguments

Format

Source

Details

Examples