st_geohash: compute geohash from (average) coordinates

In r-spatial/lwgeom: Bindings to Selected 'liblwgeom' Functions for Simple Features

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
)

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 http://geohash.org/ or https://en.wikipedia.org/wiki/Geohash.

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.

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)

r-spatial/lwgeom documentation built on Feb. 12, 2025, 10:06 a.m.