# MKMapSize Width and height information on a two-dimensional map projection. ``` struct MKMapSize ``` ## Overview If you project the curved surface of the globe onto a flat surface, what you get is a two-dimensional version of a map where longitude lines appear to be parallel. Such maps are often used to show the entire surface of the globe all at once. An `MKMapSize` data structure represents a horizontal and vertical distance as measured on this two-dimensional map. ## Topics ### Creating a map size [`init()`](/documentation/MapKit/MKMapSize/init()) Creates a map size that represents an empty area on a two-dimensional projection of a map. [`init(width:height:)`](/documentation/MapKit/MKMapSize/init(width:height:)) Creates a map size that represents an area on a two-dimensional projection of a map with the specified width and height. ### Getting standard map sizes [`world`](/documentation/MapKit/MKMapSize/world) The width and height, in map points, of the world in a two-dimensional map projection. ### Getting the width and height [`height`](/documentation/MapKit/MKMapSize/height) The height of the specified area, measured in map points. [`width`](/documentation/MapKit/MKMapSize/width) The width of the specified area, measured in map points. ### Comparing map sizes [`MKMapSizeEqualToSize(_:_:)`](/documentation/MapKit/MKMapSizeEqualToSize(_:_:)) Returns a Boolean value that indicates whether two map sizes are equal. ### Getting a description of the size [`MKStringFromMapSize(_:)`](/documentation/MapKit/MKStringFromMapSize(_:)) Returns a formatted string for the specified map size. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)