How do I set the coordinate system for a map displaying a raster in ArcGIS Pro?

To set the coordinate system for a map or scene in ArcGIS Pro, which is essential for correctly displaying raster data, follow these steps:

Setting the coordinate system of your map frame ensures that all layers, including your raster datasets, are displayed and aligned correctly. While rasters typically come with their own coordinate system information, the map's coordinate system determines how they are projected and viewed.

Here are the steps to set the coordinate system for your map or scene in ArcGIS Pro, based on the provided reference:

1. Open Map Properties: In the Contents pane, locate the map or scene for which you want to set the coordinate system. Right-click on the map or scene name (usually at the top of the Contents pane) and select Properties.
2. Access Coordinate Systems Tab: In the Map Properties dialog box that appears, click the Coordinate Systems tab.
3. Change Coordinate System: On the Coordinate Systems tab, you will see the current coordinate systems listed under "Current XY" (for horizontal) and "Current Z" (for vertical, if applicable).
   • To change the horizontal coordinate system, click the button located below the Current XY heading.
   • To change the vertical coordinate system, click the button located below the Current Z heading.
     Clicking these buttons will open a dialog where you can browse or search for predefined coordinate systems or define a custom one.

Summary of Steps:

Step	Action	Location
1. Open Map Properties	Right-click map/scene name, select Properties	Contents Pane
2. Go to Coordinate Systems	Click the Coordinate Systems tab	Map Properties dialog box
3. Change XY or Z	Click the button below the Current XY or Current Z heading to choose a new system	Coordinate Systems Tab

Setting the map's coordinate system is a fundamental step in any GIS project involving spatial data like rasters, ensuring accurate visualization and analysis. Your raster data will be automatically reprojected on-the-fly to match the map's coordinate system for display.