RgoogleMaps (version 1.5.1)

Tile2R: simple utility to offset and scale XY coordinates with respect to the center

Description

simple utility to offset and scale XY coordinates with respect to the center

Usage

Tile2R(points, center)

Value

list with X and Y pixel values

Arguments

points

XY coordinates returned by e.g. LatLon2XY

center

XY coordinates of center returned by e.g. LatLon2XY

Author

Markus Loecher

Details

mainly used for shrinking the size of a tile to the minimum size.

Examples

latR <- c(34.5,34.9);


 lonR <- c(-100.3, -100);


 lat.center <- 34.7;


 lon.center <- -100.2;


 zoom = 10;


 ll <- LatLon2XY(latR[1], lonR[1], zoom);#lower left corner


 ur <- LatLon2XY(latR[2], lonR[2], zoom );#upper right corner


 cr <- LatLon2XY(lat.center, lon.center, zoom );#center


 ll.Rcoords <- Tile2R(ll, cr);


 ur.Rcoords <- Tile2R(ur, cr);