silverblaze: Geographic Profiling in R

Convert lon/lat coordinates to cartesian coordinates by first calculating great circle distance and bearing and then mapping these coordinates into cartesian space. This mapping is relative to the point centre_lat, centre_lon, which should be roughly at the midpoint of the observed data.

1	lonlat_to_cartesian(centre_lon, centre_lat, data_lon, data_lat)

`centre_lon`	The centre longitude
`centre_lat`	The centre latitude
`data_lon`	The data longitude
`data_lat`	The data latitude

# Centre at QMUL
centre_lon <- -0.040827
centre_lat <- 51.523775
# Data point at Queen Elizabeth Park
data_lon <- -0.016546
data_lat <- 51.542473
lonlat_to_cartesian(centre_lon = centre_lon,
                    centre_lat = centre_lat,
                    data_lon = data_lon,
                    data_lat = data_lat)