latlong_as_xy: Convert lat long co-ordinates to x,y

In CRTspat: Workflow for Cluster Randomised Trials with Spillover

Convert lat long co-ordinates to x,y

Description

latlong_as_xy converts co-ordinates expressed as decimal degrees into x,y

Usage

latlong_as_xy(trial, latvar = "lat", longvar = "long")

Arguments

trial	A trial dataframe or list of class "CRTsp" containing latitudes and longitudes in decimal degrees
latvar	name of column containing latitudes in decimal degrees
longvar	name of column containing longitudes in decimal degrees

Details

The output object contains the input locations replaced with Cartesian coordinates in units of km, centred on (0,0), corresponding to using the equirectangular projection (valid for small areas). Other data are unchanged.

Value

A list of class "CRTsp" containing the following components:

geom_full	list:	summary statistics describing the site
trial	data frame:	rows correspond to geolocated points, as follows:
	x	numeric vector: x-coordinates of locations
	y	numeric vector: y-coordinates of locations
	...	other objects included in the input "CRTsp" object or data frame

Examples

examplexy <- latlong_as_xy(readdata("example_latlong.csv"))

CRTspat documentation built on April 13, 2025, 9:09 a.m.