Geohash neighborhoods

Return the geohashes adjacent to input geohashes

gh_neighbors(geohashes, self = TRUE)

gh_neighbours(geohashes, self = TRUE)

Arguments

geohashes

character vector of input geohashes. There's no need for all inputs to be of the same precision.

self

Should the input also be returned as a list element? Convenient for one-line usage / piping

Value

list with character vector entries in the direction relative to the input geohashes indicated by their name (e.g. value$south gives all of the southern neighbors of the input geohashes).

The order is self (if self = TRUE), southwest, south, southeast, west, east, northwest, north, northeast (reflecting an easterly, then northerly traversal of the neighborhod).

Details

North/south-pole adjacent geohashes are missing three of their neighbors; these will be returned as NA_character_.

References

http://geohash.org/ ( Gustavo Niemeyer's original geohash service )

Author

Michael Chirico

Examples

gh_neighbors('d7q8u4')
#> $self
#> [1] "d7q8u4"
#> 
#> $southwest
#> [1] "d7q8gc"
#> 
#> $south
#> [1] "d7q8u1"
#> 
#> $southeast
#> [1] "d7q8u3"
#> 
#> $west
#> [1] "d7q8gf"
#> 
#> $east
#> [1] "d7q8u6"
#> 
#> $northwest
#> [1] "d7q8gg"
#> 
#> $north
#> [1] "d7q8u5"
#> 
#> $northeast
#> [1] "d7q8u7"
#>