ggmap (version 3.0.0)

LonLat2XY: Convert a lon/lat coordinate to a tile coordinate

Description

Convert a lon/lat coordinate to a tile coordinate for a given zoom. Decimal tile coordinates (x, y) are reported.

Usage

LonLat2XY(lon_deg, lat_deg, zoom, xpix = 256, ypix = 256)

Value

a data frame with columns X, Y, x, y

Arguments

lon_deg

longitude in degrees

lat_deg

latitude in degrees

zoom

zoom

xpix

width of tile in pixels

ypix

length of tile in pixels

Author

David Kahle , based on function LatLon2XY by Markus Loecher, Sense Networks in package RgoogleMaps

See Also

http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames

Examples

if (FALSE) {
gc <- geocode('baylor university')
LonLat2XY(gc$lon, gc$lat, 10)

}