Tile2R {RgoogleMaps}

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)

Arguments

points

XY coordinates returned by e.g. LatLon2XY

center

XY coordinates of center returned by e.g. LatLon2XY

Details

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

Value

list with X and Y pixel values

Author(s)

Markus Loecher

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);