Returns distances from known locations in locationTbl, one for each incoming location. If no known location is found within distanceThreshold meters for a particular incoming location, that distance in the vector will be NA.

table_getNearestDistance(
  locationTbl = NULL,
  longitude = NULL,
  latitude = NULL,
  distanceThreshold = NULL,
  measure = "geodesic"
)

Arguments

locationTbl

Tibble of known locations.

longitude

Vector of longitudes in decimal degrees E.

latitude

Vector of latitudes in decimal degrees N.

distanceThreshold

Distance in meters.

measure

One of "haversine" "vincenty", "geodesic", or "cheap" specifying desired method of geodesic distance calculation. See ?geodist::geodist.

Value

Vector of distances from known locations.

Note

The measure "cheap" may be used to speed things up depending on the spatial scale being considered. Distances calculated with measure = "cheap" will vary by a few meters compared with those calculated using measure = "geodesic".

Examples

library(MazamaLocationUtils) locationTbl <- get(data("wa_monitors_500")) # Wenatchee lon <- -120.325278 lat <- 47.423333 # Too small a distanceThreshold will not find a match table_getNearestDistance(locationTbl, lon, lat, distanceThreshold = 50)
#> [1] NA
# Expanding the distanceThreshold will find one table_getNearestDistance(locationTbl, lon, lat, distanceThreshold = 5000)
#> [1] 1495.593