Geographic

Use this option to convert coordinates of selected objects from:

• Australian Map Grid (AMG), Integrated Survey Grid (ISG), World Geodetic Systems (WGS 84) and Map Grid of Australia (MGA) to latitudes/longitudes and vice versa.
• AMG to ISG and vice versa.
• Zone changes on overlapping zones for AMG.

Note:  This option uses Redfearns Formulae to perform a direct conversion of the coordinates. Both AMG and ISG are based on the same spheroid, which means that you can convert freely from AMG to ISG. However, this option does not convert from AMG or ISG to MGA. Use the GDA Conversion option to convert AMG of ISG to MGA.

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Instructions

On the Design menu, point to Transformation, then click Geographic.

Follow these steps:

1. Choose the Transform Required.

   Option	Description
   UTM to Lat/Long	Convert map grid coordinates to geographic coordinates. Enter the current grid and zone.
   Lat/Long to UTM	Convert geographic coordinates to map grid. Enter the resulting grid and zone.
   UTM to UTM	Convert AMG ↔ ISG or change AMG zones. Specify both current and new zones.

2. Define the Current and Resultant Datum Details.

   For both the Current datum and the Resultant datum, you can choose the EPSG code by selecting it from the drop-down list, or by typing the name of the datum into the box labelled Find by name.

   If you want to apply a unit conversion, select the type of conversion from the list. This step is optional.

3. Choose the processing method.

   • Select Replace Original Object to directly transform the existing object.

   • Select Create Copy to generate a transformed copy. You’ll be prompted to enter a new layer name.

4. Confirm and select the items to apply the transformation.

   Click OK to begin the process.

   The Multiple Selection box will appear. Use it to choose which objects to transform.

5. View the transformed data. Transformed objects may fall outside the visible range. Navigate to View > Windows > Fit Layer to adjust and display the updated coordinates.