MazamaLocationUtils (version 0.2.0)

location_createID: Create one or more unique locationIDs

Description

A unique locationID is created for each incoming longitude and latitude. The following code is used to generate each locationID. See the references for details.

# Retain accuracy up to ~.1m
locationString <- paste0(
  sprintf("%.7f", longitude),
  "_",
  sprintf("%.7f", latitude)
)
# Avoid collisions until billions of records
locationID <- digest::digest(locationString, algo = "xxhash64")  

Usage

location_createID(longitude = NULL, latitude = NULL)

Arguments

longitude

Vector of longitudes in decimal degrees E.

latitude

Vector of latitudes in decimal degrees N.

Value

Vector of character locationIDs.

References

https://en.wikipedia.org/wiki/Decimal_degrees

https://www.johndcook.com/blog/2017/01/10/probability-of-secure-hash-collisions/

Examples

# NOT RUN {
library(MazamaLocationUtils)

# Wenatchee
lon <- -120.325278
lat <- 47.423333
locationID <- location_createID(lon, lat)
# }