OSGB function

Ordnance Survey for Great Britain grid reference system

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.

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

Returns

character

Examples

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

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

OSGB(g, inverse=TRUE)