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In the Add World Coordinates Online dialog box, choose an unassigned control point location in the Matching Point Location drop-down list, then click the corresponding location on the online map to assign it a world coordinate. Click the Assign World Coordinates Online button to assign real-world WGS 84 coordinates using an online map service (an Internet connection is required). The display format of world coordinates in the table is set in Georeference Preferences.Ī control point must be created prior to assigning it a world coordinate online. survey, corresponding maps, etc), or from online map sources. World coordinates can be sourced from the information displayed on the image itself (such as grids or graticules), from external sources (e.g. See the Coordinate Formats section to learn about the types of coordinate formats that can be entered. It is common for lat/long values in WGS 84 coordinates are used.

If it is unknown, entering X and Y values will use an Image Coordinate System. Any coordinate system can be used to specify coordinates. You can specify a control point coordinate system using the Coordinate System hyperlink. Double-click the Coordinate System, WX, or WY cell of a control point to enter or edit its world coordinates manually in the Edit Location dialog box. If no image coordinate system is specified, it will be assigned "Image CS" until one is specified.įor each control point, enter the corresponding real-world coordinates (WX and WY) in the Control Point List to create a control pair. When a CSV file contains control points that don't have coordinate system information, the imported points will be assigned to the image's coordinate system.

Exported CSV files created with Geographic Imager contain the control point name, pixel location, world coordinates, and the associated coordinate system the world coordinates are entered in. Imported control points are added to the existing list. The only supported reference point file format is Comma Delimited files (.csv). To import a set of defined control points, click the Import Additional Control Points button. This way you can ensure you can identify the location online before creating the control point. If you are assigning world coordinates online you can add points later with the Assign World Coordinates Online dialog box opens. Points are added to the Control Point List below the image view and are automatically assigned a name and pixel coordinates (PX and PY). Pixel and coordinate locations of the cross-hair are displayed along the bottom of the image view. Click within the extent of the current image to add a control point. The cursor in the image view becomes a crosshair. To add control points in the image view, first, click the Add Point button to enable it. These control points and their coordinate and error values (if available) are shown in the Control Point List. The image view shows the current image and any existing control points. With an opened image (referenced or unreferenced), click the Georeference button in the Geographic Imager panel to open the Georeference dialog box.

Reference or rectify the image when you’re satisfied with the registration.

Validate the accuracy of the georeference.

Check total world error of control points and adjust as necessary.

Specify one or use Solve/Find Best and choose one from a list of estimated coordinate systems.

Choose an appropriate image coordinate system.

If you want to rectify the image, choose an appropriate transformation method (rectify is generally used to scale, stretch, rotate, and distort an image).

By default, the Georeference dialog box is set to reference an image without rectification.

Enter manually or assign world coordinates using an online map service.

Assign world coordinates (WX and WY) to each control point (PX and PY) to create a control pair.

Through the image view or import into the Control Point List. In general, the steps for georeferencing an image are as follows: Any referenced or unreferenced image can be used with the Georeference dialog box-verify a referenced image or reference an unreferenced image.