simple utility to offset and scale XY coordinates with respect to the center
simple utility to offset and scale XY coordinates with respect to the center
Tile2R(points, center)
mainly used for shrinking the size of a tile to the minimum size.
list with X and Y pixel values
Markus Loecher
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);
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.