OSGB: Ordnance Survey for Great Britain grid reference system

In rspatial/geosphere: Spherical Trigonometry

Ordnance Survey for Great Britain grid reference system

Description

Convert coordinates to the grid reference system used by the Ordnance Survey for Great Britain. Or do the inverse operation to get coordinates for a grid code.

Usage

OSGB(xy, precision, geo=FALSE, inverse=FALSE)

Arguments

xy	x coordinate pairs (vector, matrix, data.frame

; or grid codes if inverse=TRUE.

precision	character. One of "1m", "5m", "10m", "50m", "100m", "500m", "1km", "5km", "10km", "50km", "100km", "500km"
geo	If TRUE the input coordinates are in longitude/latitude (on the airy ellipsoid!). If FALSE they must be in the "OSGB36 / British National Grid" coordinate reference system ("EPSG:27700" or "+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +units=m")
inverse	If TRUE, coordinates are computed for the grid codes in x

Value

character

Examples

pnts <- rbind(cbind(93555 , 256188), 
			  cbind(210637, 349798),
			  cbind(696457, 481704))

g <- OSGB(pnts, "1km", geo=FALSE)
g

OSGB(g, inverse=TRUE)

rspatial/geosphere documentation built on Oct. 12, 2024, 11:44 a.m.