McSpatial (version 2.0)

geodistance: Calculates distances using the great circle formula

Description

geodistance calculates distances in miles between a set of observations and a location. Distances are calculated in miles using the great circle formula. Geographic coordinates must be expressed in latitudes and longitudes.

Usage

geodistance(longvar, latvar, lotarget, latarget, dcoor = FALSE)

Arguments

longvar

Longitude variable, in degrees.

latvar

Latitude variable, in degrees.

lotarget

Target longitude.

latarget

Target latitude.

dcoor

If dcoor = T, also calculates the distance east (deast) and north (dnorth) of the target point.

Value

dist

A vector with the distance in miles between each data point and the target point.

dnorth

A vector with the number of miles north of the target point for each data point. dnorth < 0 for observations that are south of the target point.

deast

A vector with the number of miles east of the target point for each data point. deast < 0 for observations that are west of the target point.

See Also

geodensity

geoshape

Examples

data(cookdata)
dcbd <- geodistance(cookdata$LONGITUDE, cookdata$LATITUDE, -87.627800, 41.881998)$dist