The Test tab of the Coordinate Reference System dialog box is used to show transformation details from the currently selected CRS to another CRS, by default WGS 84.
Test coordinates can be entered in a format suitable for the selected CRS - geographic coordinates for a geodetic CRS, projected coordinates for a projected CRS - and transformed to the destination CRS. The result of the calculations at each step of the transformation is shown, identifying each stage when concatenated transformations are performed. The end results can then be compared against known values to confirm whether a transformation is setup correctly in the bound CRS support file.
This dialog box is accessed through the Info button of a CRS in the CRS selection dialog box.
Interface
The Test tab of the Coordinate Reference System dialog box is described below.
Option | Description | |
|---|---|---|
Source | Geographic | Enable this option to specify the test coordinates in geographic format instead of ground format. Enabling and disabling this field will change the coordinate fields to allow entry in the selected format. |
Epoch | Specify an epoch time to apply to the source CRS for transformation. 1. Click on a section of the date in the Epoch field. 2. Use the Up and Down Arrow buttons to change the value. 3. Repeat for each piece of the date value. | |
Coordinate fields | Enter the test coordinates in the coordinate fields. Depending on the coordinate format being entered, the fields will be labelled either Easting and Northing or Geodetic latitude and Geodetic longitude. | |
Easting/Northing: If entering ground coordinates: 1. Type a value in each field. 2. Select the relevant unit of measure from the drop-down lists. | ||
Geodetic latitude/Geodetic longitude: If entering geographic coordinates: 1. Select the coordinate format from the drop-down lists. 2. Type a value in each field. 3. Select the direction for each coordinate from the drop-down lists. | ||
Destination | Coordinate Reference System | The coordinate reference system for which you want to test the transformation. 1. Click the browse button (...) to launch the Select Coordinate Reference System dialog box. 2. Select a CRS from one of the lists in the dialog box. 3. Click OK. |
Epoch | Specify an epoch time to apply to the destination CRS for transformation. 1. Click on a section of the date in the Epoch field. 2. Use the Up and Down Arrow buttons to change the value. 3. Repeat for each piece of the date value. | |
Geodetic latitude/Geodetic longitude | These fields are populated with the resulting transformed coordinates when the transformation test is run. | |
Test | Click this button to perform the transformation test. | |
Swap | This button can be used to reverse the test, using the destination CRS as the input and the source CRS as the output. | |
Results area | This area is populated with the details of the transformation when the Test button is clicked and the transformation test is run. | |
Procedure
1. Select the 2D View Properties command to launch the Display Window Properties dialog box.
2. Click the Coordinate reference system browse button (...) to launch the Select Coordinate Reference System dialog box.
3. Select a CRS from the lists and click the Info button for that system.
The Coordinate Reference System information dialog box is displayed, populated with information about the selected system.
4. Select the Test tab.
5. [Optional] Specify an Epoch date for the source CRS if one is needed.
6. Enter the coordinates for the test point.
7. Click the browse button (...) for the Destination CRS and select the relevant CRS from one of the lists.
8. [Optional] Specify an Epoch date for the destination CRS if one is needed.
9. Click Test.
The transformed coordinates will be displayed in the Destination coordinate fields and the details of the transformation are displayed in the results area.