Selecting or deselecting this item controls whether the 1 degree of latitude to 1 degree of longitude aspect ratio is maintained. When map Isotropic is set, then resizing the map will always result in a map with the correct aspect ratio. For example, if the entire world in the cylindrical projection is the current display, resizing the boundary to a perfect square and releasing will still result with a map that is rectangular. If a square cylindrical work projection is desired then map Isotropic must be OFF.