Anonymize locations of a trial site

anonymize_site transforms coordinates to remove potential identification information.

Usage

anonymize_site(trial, ID = NULL, latvar = "lat", longvar = "long")

Arguments

trial

"CRTsp" object or trial data frame with co-ordinates of households

ID

name of column used as an identifier for the points

latvar

name of column containing latitudes in decimal degrees

longvar

name of column containing longitudes in decimal degrees

Value

A list of class "CRTsp".

Details

The coordinates are transformed to support confidentiality of information linked to households by replacing precise geo-locations with transformed co-ordinates which preserve distances but not positions. The input may have either lat long or x,y coordinates. The function first searches for any lat long co-ordinates and converts these to x,y Cartesian coordinates. These are then are rotated by a random angle about a random origin. The returned object has transformed co-ordinates re-centred at the origin. Centroids stored in the "CRTsp" object are removed. Other data are unchanged.

Examples

#Rotate and reflect test site locations
transformedTestlocations <- anonymize_site(trial =  readdata("exampleCRT.txt"))