Set an extent constraint A map extent defines the geographic boundaries for displaying GIS information within a map frame. These boundaries contain top, bottom, left, and right coordinates. These are the edges of the map extent.
Map extent options and their effect on map navigation A map extent defines the geographic boundaries for displaying GIS information within a data frame.
These boundaries contain top, bottom, left, and right coordinates. These are the edges of the map extent. For example, the image below shows a map centered on the U. The map image also shows the extent boundaries. The units for these values are the same as the map units.
In this case, the map is projected in Albers, and the map units are meters. Map extents are affected by map scale. As you zoom in or out of a map, the map extent changes, provided that the data frame size on the page remains the same. In some cases, you will want to control the map extent. For instance, you might only be interested in a geographic subset of your data and want to limit the map user to this area.
Or, you may want to limit users to a particular map scale while allowing them to pan to different locations.
Also, you may want to derive the map extent of one data frame, for example, an inset map, based on the map extent of a different data frame. ArcMap provides a number of options in which you can control a map's extent: Notice that with this option there are no other controls or options available in the Extent portion of the dialog box.
Appropriate controls are added based on the extent option chosen. Automatic This is the default option. This option places no restrictions on map navigation. You can freely pan, zoom, or use bookmarks. When you do, the map's extent and scale change automatically.
If you change the data frame size on the layout, the map extent and scale will change as the data frame changes. Fixed Extent This option keeps the map extent constant.
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The geographic boundaries of the map—the top, bottom, left, and right coordinates—are specifically defined. These values should be in map units. There are six ways that you can set a fixed extent: The current extent of the data frame The combined extent of all the features in a specific layer The combined extent of all the features in a specific layer visible in the current map extent The combined extent of all selected features in a specific layer The combined extent of all or any selected graphic shapes you draw inside the data frame in other words, in data view or in a focused data frame The graphic or graphics you want to use to define the data frame extent must be selected; otherwise, the Outline of selected graphic s option will be unavailable.
If you intend to create a map layout using a fixed extent, you should set the fixed extent while in layout view.
Map navigation is restricted for this data frame. You cannot pan, zoom, or use bookmarks. If you choose this option, appropriate map navigation tools and commands will be unavailable. If you resize the data frame on the page layout, the map scale will change to keep the extent constant. If you resize the data frame on the page layout, the map scale will change.
The geographic area displayed in the map does not change, as illustrated below: Fixed Scale This option keeps the map scale constant. Enter the scale you want to use. You can enter the scale in absolute format, such as 1: You can enter scales in absolute or relative format irrespective of what format the scale control is currently using.
When you enter a scale, it automatically is converted to the current scale format being displayed. When you type scales into this field, they remain at the top of the list for the duration of your session so that they can be easily accessed again in this dialog box or anywhere else scale is specified.
Customizations you make to the list of predefined scales and how scale is displayed are stored as ArcMap settings on your computer; they are not stored in the map document itself so will not be in effect if the map document is opened on a different machine. A variety of scale formatting is supported: In absolute format, the 1: Any character or word can be used as the separator in absolute format:May 11, · Weekday morning in January at a Toyoko Line station between Shibuya and Yokohama (Naka Meguro).
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