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

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

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

Value

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

Author(s)

David Kahle david.kahle@gmail.com, based on function LatLon2XY by Markus Loecher, Sense Networks markus@sensenetworks.com in package RgoogleMaps

See Also

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

Examples

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## Not run: 
gc <- geocode('baylor university')
LonLat2XY(gc$lon, gc$lat, 10)


## End(Not run)

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