Menu | View > Change Coordinate Reference System |
Tool |
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Status bar | [Coordinate reference system] |
Menu | View > Change Coordinate Reference System |
Tool |
|
Status bar | [Coordinate reference system] |
Select a coordinate reference system for the current data.
Coordinate reference systems represent an area of the globe on a flat surface. Projecting features of a spherical earth onto a flat map usually causes some or all of the features to be distorted. For example, the features may be stretched in one direction, or they may appear relatively larger than features in other areas of the map. Selecting a projection appropriate for the area being viewed helps to minimize the distortion.
Coordinate reference systems (CRS) are based on entries in a set of support files, which are user configurable. By default, CARIS applications are setup with the projections and datums defined by EPSG, a global standard, as well as a number of custom projections and datums that are known to have been used by organizations around the world. It is possible to add custom entries; see the Support Files Guide for more information. The CRS dialog boxes also store recently used values and support setting favourites; see below for more information.
Related commands: Use Coordinate Reference System
Interface
The Select Coordinate Reference System dialog box, launched from the Change Coordinate Reference System Command, is used to select a reference system to apply to the view.
This dialog box contains a search box and four tabs:
Tab | Displays |
Current | The coordinate reference system of the currently open data. |
Favourites | Any coordinate reference system that has been marked as a favourite. |
Recent | Recently used coordinate reference systems. |
Search | Coordinate reference systems that match the search criteria entered in the search box. The tab is renamed to Search Results once a search has been performed. |
Each coordinate reference system has two icons displayed on the right side of the dialog box. These icons are displayed when you click on or hover over a coordinate reference system in a tab. If a system is marked as a favourite, the Favourite icon is persisted at all times in all tabs.
Icon | Command | Description |
| Favourite | This button is used to identify favourite or frequently used reference systems. If a reference system is identified as a favourite, the icon is yellow and that reference system is listed on the Favourites tab. Otherwise the icon is grey. 1. Click the Favourite icon to add the reference system to the Favourites tab. 2. Click the icon a second time to remove the system from the favourites. |
| Info | This icon is used to display information about the system. If you hover over the icon, a tooltip displays information about the coordinate reference system.
If you click the icon, the advanced coordinate reference system Information dialog box is displayed with more details. See Advanced Coordinate Reference System. |
Search
The search box is used to search for coordinate reference systems using a text string. Strings are found if they appear in the identifier, the reference system name, or the area of use.
To search for coordinate reference systems:
1. Type a string in the Search box.
Results are displayed in the Search Results tab.
2. Press <ESC> to clear the search box.
Advanced Coordinate Reference System
The Coordinate Reference System dialog box displays detailed information on the selected reference system, including names, major components, and values. This information is read-only and cannot be modified.
This dialog box contains these tabs:
Tab | Description |
Details | This dialog box displays detailed information on the selected reference system, including names, major components, and values. This information cannot be modified. The nodes of the coordinate reference system are displayed in the list on the left. 1. Click on a node. Node properties are displayed on the right. |
WKT | This tab displays the coordinate reference system as a WKT (Well Known Text) string. You can select and copy this string using the pop-up menu. |
Procedure
1. Select the Change Coordinate Reference System command.
The Select Coordinate Reference System dialog box is displayed.
2. Select a coordinate reference system using one of the following methods:
• Select the Favourites tab and select a reference system from your list of favourites.
• Select the Recent tab and select a recently used reference system.
• Type a string in the Search box and select a reference system returned in the Search Results tab.
3. Click OK.
You can also double-click a coordinate reference system in any of the tabs. This will close the dialog box and apply the selection. |
The selected reference system is applied to the view.
