st_shift_longitude: Shift or re-center geographical coordinates for a Pacific...

In sf: Simple Features for R

Shift or re-center geographical coordinates for a Pacific view

Description

All longitudes < 0 are added to 360, to avoid for instance parts of Alaska being represented on the far left and right of a plot because they have values straddling 180 degrees. In general, using a projected coordinate reference system is to be preferred, but this method permits a geographical coordinate reference system to be used. This is the sf equivalent of recenter in the sp package and ST_ShiftLongitude in PostGIS.

Usage

st_shift_longitude(x)

## S3 method for class 'sfc'
st_shift_longitude(x, ...)

## S3 method for class 'sf'
st_shift_longitude(x, ...)

Arguments

x	object of class sf or sfc
...	ignored

Examples

## sfc
pt1 = st_point(c(-170, 50))
pt2 = st_point(c(170, 50))
(sfc = st_sfc(pt1, pt2))
sfc = st_set_crs(sfc, 4326)
st_shift_longitude(sfc)

## sf
d = st_as_sf(data.frame(id = 1:2, geometry = sfc))
st_shift_longitude(d)

sf documentation built on Oct. 11, 2024, 9:08 a.m.