https://github.com/cran/RgoogleMaps
Tip revision: cc7c38b38ccf45852de311d06b1680c6c4acb5d6 authored by Markus Loecher on 20 January 2015, 00:00:00 UTC
version 1.2.0.7
version 1.2.0.7
Tip revision: cc7c38b
LatLon2XY.Rd
\name{LatLon2XY}
\alias{LatLon2XY}
\title{computes the coordinate transformation from lat/lon to map tile coordinates }
\description{The function LatLon2XY(lat,lon,zoom) computes the coordinate transformation from lat/lon to map tile coordinates given a zoom level.
It returns the tile coordinates as well as the pixel coordinates within the Tile itself.
Thanks to Neil Young (see \url{http://groups.google.com/group/Google-Maps-API/browse_thread/thread/d2103ac29e95696f?hl=en}) for providing the formulae used.}
\usage{LatLon2XY(lat, lon, zoom)}
\arguments{
\item{lat}{latitude values to transform}
\item{lon}{longitude values to transform}
\item{zoom}{zoom level.lat,lon,zoom}
}
\value{A list with values
\item{Tile}{integer numbers specifying the tile}
\item{Coords}{pixel coordinate within the Tile}}
\author{Markus Loecher}
\note{The fractional part times 256 is the pixel coordinate within the Tile itself. }
\examples{
LatLon2XY(38.45, -122.375, 11)
}