dtMidpoint: dt midpoint

In SymbolixAU/spatialdatatable:

Description

Finds the half-way point along the great circle path between two points

Usage

dtMidpoint(latFrom, lonFrom, latTo, lonTo)

Arguments

latFrom	latitude from
lonFrom	longitude from
latTo	latitude to
lonTo	longitude to

Value

list of the latitude & longitude coordinates at the midpoint along the line

Examples

dtMidpoint(0,0,0,52)

dtMidpoint(25, 0, -25, 0)

dtMidpoint(-37,144,-38,145)

dtMidpoint(25, 0, 35, 0)

n <- 10
set.seed(20170511)
lats <- -90:90
lons <- -180:180
dt <- data.table::data.table(lat1 = sample(lats, size = n, replace = T),
                             lon1 = sample(lons, size = n, replace = T),
                             lat2 = sample(lats, size = n, replace = T),
                             lon2 = sample(lons, size = n, replace = T))

dt[, c("latMid", "lonMid") := dtMidpoint(lat1, lon1, lat2, lon2)]

SymbolixAU/spatialdatatable documentation built on May 6, 2019, 11:20 a.m.