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Menu | View > Display Window Properties |
Status bar | [Coordinate reference system] |
Select a coordinate reference system for the current data.
A coordinate reference system (CRS) represents an area of the globe on a flat surface. Projecting the 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 are based on entries in a set of support files, which are user-configurable. By default CARIS applications are set up with the projections and datums defined by EPSG, a global standard, but many custom projections and datums that are known to have been used by organizations around the world are available. You can also add custom entries; see Support Files for more information.
CRS dialog boxes store recently used values and support setting favourites.
Related commands:
• | • |
Interface
Tab | Displays |
|---|---|
Current | Coordinate reference system for the currently open data. |
Favourites | Any coordinate reference system that has been marked as a favourite. |
Recent | Recently used coordinate reference systems. |
Custom | Any custom coordinate reference systems that you have created. You can also create custom systems on this tab. For more information, see Create Custom Coordinate Reference System. |
Search | Coordinate reference systems that match the search criteria entered in the search box. After a search is performed, the tab is renamed Search Results. |
Each CRS displays two icons at right when you click or hover over a CRS listing on any tab. If a CRS is marked as a favourite, the Favourite icon is visible at all times on all tabs.
Button | Command | Description |
|---|---|---|
| Favourite | Identifies favourite or frequently used coordinate reference systems. If a CRS is identified as a favourite, the icon is yellow and the CRS is listed on the Favourites tab. Otherwise, the icon is grey. To add a CRS to the Favourites tab, click the Favourite icon. To remove a CRS from the Favourites tab, click the icon a second time. |
| Info | Displays information about the selected CRS. When you hover over the icon, a tooltip displays information in the following format.
If you click the icon, the advanced coordinate reference system dialog box is displayed with more detailed information, as shown in Coordinate Reference System dialog box - Advanced. |
Search
Search for coordinate reference systems by typing a text string in the Search box. Strings are found if they appear in the identifier, the reference system name, or the area of use.
1. Type a string in the Search box.
Results are displayed on the Search Results tab.
2. Review the results.
3. Press <ESC> to clear the search box.
Coordinate Reference System dialog box - Advanced
The Coordinate Reference System dialog box displays detailed information on the selected CRS. This information is read-only and cannot be modified.
Tab | Description |
|---|---|
Details | Displays detailed information on the selected CRS, including names, major components and values. This information cannot be modified. The nodes of the coordinate reference system are displayed in the list at left. 1. Click a node. Node properties are displayed at right. |
WKT | Displays the CRS as a WKT (Well Known Text) string. You can select and copy this string using the pop-up menu. |
Test | Displays details of the transformation from the currently selected CRS to another CRS, by default WGS 84. This is useful when testing CRS transformations that have been set up in the boundcrs.dat support file for the application. For more information, see Testing the transformation. |
Procedure
1. Select the Select 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 then select a CRS from your list of favourites.
• Select the Recent tab and then select a recently used CRS.
• Type a string in the Search box and then select a reference system returned on the Search Results tab.
3. Click OK.
The selected reference system is applied to the view.
You can also double-click a coordinate reference system on any tab. The dialog box closes and your selection is applied. |
