R: simple utility to offset and scale XY coordinates with...

Tile2R {RgoogleMaps} | R Documentation

## 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);

[Package RgoogleMaps version 1.4.1 Index]