lwgeom (version 0.2-17)

st_geohash: compute geohash from (average) coordinates

Description

compute geohash from (average) coordinates

Usage

st_geohash(x, precision = 0)
st_geom_from_geohash(
  hash,
  precision = -1,
  crs = st_crs("OGC:CRS84"),
  raw = FALSE
)

Value

`st_geohash` returns a character vector with geohashes; empty or full geometries result in `NA`

`st_geom_from_geohash` returns a (bounding box) polygon for each geohash if `raw` is `FALSE`, if `raw` is `TRUE` a matrix is returned with bounding box coordinates on each row.

Arguments

x

object of class sf, sfc or sfg

precision

integer; precision (length) of geohash returned. From the liblwgeom source: ``where the precision is non-positive, a precision based on the bounds of the feature. Big features have loose precision. Small features have tight precision.''

hash

character vector with geohashes

crs

object of class `crs`

raw

logical; if `TRUE`, return a matrix with bounding box coordinates on each row

Details

see https://en.wikipedia.org/wiki/Geohash.

Examples

library(sf)
lwgeom::st_geohash(st_sfc(st_point(c(1.5,3.5)), st_point(c(0,90))), 2)
lwgeom::st_geohash(st_sfc(st_point(c(1.5,3.5)), st_point(c(0,90))), 10)
st_geom_from_geohash(c('9qqj7nmxncgyy4d0dbxqz0', 'up'), raw = TRUE)
o = options(digits = 20) # for printing purposes
st_geom_from_geohash(c('9qqj7nmxncgyy4d0dbxqz0', 'u1hzz631zyd63zwsd7zt'))
st_geom_from_geohash('9qqj7nmxncgyy4d0dbxqz0', 4) 
st_geom_from_geohash('9qqj7nmxncgyy4d0dbxqz0', 10)
options(o)