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

Description Format Details Source Examples

Description

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).

Format

The list object contains the following results:

id

Identifier for the SDD estimation - it should be unique

points

a simple two-column data frame (or matrix) containing x,y coordinates for a series of point locations.

coordsSDD

coordsSDD value, coordinates of the SDD

SDD

SDD value, radius of the SDD

calccentre

Boolean: TRUE if mean centre is computed

weighted

Boolean: TRUE if the weighted mean centre is to be used instead

weights

Weights applied to point observations

CENTRE.x

X-coordinate of the centre

CENTRE.y

Y-coordinate of the centre

SDD.area

Area of the SDD circle

Details

The coordinates of the points must have the same units and projection as the specified center.

Source

This demonstration data has been manufactured for illustrative purposes only.

Examples

1
2

Example output

Loading required package: splancs
Loading required package: sp

Spatial Point Pattern Analysis Code in S-Plus
 
 Version 2 - Spatial and Space-Time analysis

Loading required package: Hmisc
Loading required package: lattice
Loading required package: survival
Loading required package: Formula
Loading required package: ggplot2

Attaching package: 'Hmisc'

The following object is masked from 'package:splancs':

    zoom

The following objects are masked from 'package:base':

    format.pval, round.POSIXt, trunc.POSIXt, units

Loading required package: shapefiles
Loading required package: foreign

Attaching package: 'shapefiles'

The following objects are masked from 'package:foreign':

    read.dbf, write.dbf

List of 10
 $ id        : num 1
 $ points    :'data.frame':	10 obs. of  2 variables:
  ..$ col1: num [1:10] 617816 611320 606329 620688 612836 ...
  ..$ col2: num [1:10] 4837974 4827947 4826776 4839942 4828455 ...
 $ coordsSDD : num [1:360, 1:2] 619059 619058 619054 619048 619039 ...
 $ SDD       : num 8118
 $ calccentre: logi TRUE
 $ weighted  : logi FALSE
 $ weights   : NULL
 $ CENTRE.x  : num 610941
 $ CENTRE.y  : num 4830837
 $ SDD.area  : num 2.07e+08

aspace documentation built on May 2, 2019, 6:24 a.m.

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