Return IDs of known locations — table_getLocationID • MazamaLocationUtils

Returns a vector of locationIDs for the known locations that each incoming location will be assigned to within the given. If more than one known location exists within the given distanceThreshold, the closest will be assigned. NA will be returned for each incoming that cannot be assigned to a known location in locationTbl.

table_getLocationID(
  locationTbl = NULL,
  longitude = NULL,
  latitude = NULL,
  distanceThreshold = NULL,
  measure = c("geodesic", "haversine", "vincenty", "cheap")
)

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

Value

Vector of known locationIDs.

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

locationTbl <- get(data("wa_monitors_500"))

# Wenatchee
lon <- -120.325278
lat <- 47.423333

# Too small a distanceThreshold will not find a match
table_getLocationID(locationTbl, lon, lat, distanceThreshold = 50)
#> [1] NA

# Expanding the distanceThreshold will find one
table_getLocationID(locationTbl, lon, lat, distanceThreshold = 5000)
#> [1] "c26mvd3xm6"