These functions create and export geography vectors. Unlike the BigQuery geography constructors, these functions do not sanitize invalid or redundant input using s2_union(). Note that when creating polygons using s2_make_polygon(), rings can be open or closed.

s2_geog_point(longitude, latitude)

s2_make_line(longitude, latitude, feature_id = 1L)

s2_make_polygon(
  longitude,
  latitude,
  feature_id = 1L,
  ring_id = 1L,
  oriented = FALSE,
  check = TRUE
)

s2_geog_from_text(wkt_string, oriented = FALSE, check = TRUE)

s2_geog_from_wkb(wkb_bytes, oriented = FALSE, check = TRUE)

s2_as_text(x, precision = 16, trim = TRUE)

s2_as_binary(x, endian = wk::wk_platform_endian())

Arguments

longitude, latitude

Vectors of latitude and longitude

feature_id, ring_id

Vectors for which a change in sequential values indicates a new feature or ring. Use factor() to convert from a character vector.

oriented

TRUE if polygon ring directions are known to be correct (i.e., exterior rings are defined counter clockwise and interior rings are defined clockwise).

check

Use check = FALSE to skip error on invalid geometries

wkt_string

Well-known text

wkb_bytes

A list() of raw()

x

geography vectors. These inputs are passed to as_s2_geography(), so you can pass other objects (e.g., character vectors of well-known text) directly.

precision

The number of significant digits to export when writing well-known text. If trim = FALSE, the number of digits after the decimal place.

trim

Should trailing zeroes be included after the decimal place?

endian

The endian-ness of the well-known binary. See wk::wkb_translate_wkb().

See also

See as_s2_geography() for other ways to construct geography vectors.

BigQuery's geography function reference:

Examples

# create point geographies using coordinate values: s2_geog_point(-64, 45)
#> <s2_geography[1]> #> [1] <POINT (-64 45)>
# create line geographies using coordinate values: s2_make_line(c(-64, 8), c(45, 71))
#> <s2_geography[1]> #> [1] <LINESTRING (-64 45, 8 71)>
# optionally, separate features using feature_id: s2_make_line( c(-64, 8, -27, -27), c(45, 71, 0, 45), feature_id = c(1, 1, 2, 2) )
#> <s2_geography[2]> #> [1] <LINESTRING (-64 45, 8 71)> <LINESTRING (-27 0, -27 45)>
# create polygon geographies using coordinate values: # (rings can be open or closed) s2_make_polygon(c(-45, 8, 0), c(64, 71, 90))
#> <s2_geography[1]> #> [1] <POLYGON ((-45 64, 8 71, 0 90, -45 64))>
# optionally, separate rings and/or features using # ring_id and/or feature_id s2_make_polygon( c(20, 10, 10, 30, 45, 30, 20, 20, 40, 20, 45), c(35, 30, 10, 5, 20, 20, 15, 25, 40, 45, 30), feature_id = c(rep(1, 8), rep(2, 3)), ring_id = c(1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1) )
#> <s2_geography[2]> #> [1] <POLYGON ((20 35, 10 30, 10 10, 30 5, 45 20...> #> [2] <POLYGON ((40 40, 20 45, 45 30, 40 40))>
# import and export well-known text (geog <- s2_geog_from_text("POINT (-64 45)"))
#> <s2_geography[1]> #> [1] <POINT (-64 45)>
s2_as_text(geog)
#> [1] "POINT (-64 44.99999999999999)"
# import and export well-known binary (geog <- s2_geog_from_wkb(wk::as_wkb("POINT (-64 45)")))
#> <s2_geography[1]> #> [1] <POINT (-64 45)>
s2_as_binary(geog)
#> [[1]] #> [1] 01 01 00 00 00 00 00 00 00 00 00 50 c0 ff ff ff ff ff 7f 46 40 #> #> attr(,"class") #> [1] "blob"