VIEWING MAPS USING THE NATMAP RASTER VIEWER

COORDINATE DISPLAY

For more information on the coordinate systems used in NATMAP Raster 2003, please refer to the Coordinate Systems section.

Whenever the map is panned (either using the pan tool, or using click-pan) the co-ordinates of the centre point of the map are displayed on the left pane as shown in the following image:

The type and format of the location displayed depends on the values of the buttons immediately above the location values. Locations can be display as either latitude/longitude or as grid.

Latitude and Longitude Coordinates

To display the centre location in latitude and longitude click the "LAT/LONG" button. Values can be displayed in either decimal degrees (as shown in the example above) or Degrees, Minutes and Seconds, eg. Lat: 32° 26' 12" S, Long: 148° 35' 54" E. The reference datum for the latitude and longitude can be selected as either Geocentric Datum of Australia (GDA) or Australian Geodetic Datum (AGD). Using the mouse, simply left click on the appropriate button to select the format you require. Latitudes and longitudes referenced to GDA are directly compatible values from GPS receivers.

Grid Coordinates

To display the centre location in grid coordinates click the "GRID" button. This will hide the latitude and longitude and display the current position in Easting/Northing/Zone format. The reference datum for the Easting and Northing can be selected as either Map Grid of Australia (MGA) or Australian Map Grid (AMG). Simply click on the appropriate button to select the format you require. Note that MGA is the default reference datum for grid coordinates. The Decimal and DEG buttons are disabled when in Grid mode as they are irrelevant.

The image below illustrates the centre coordinates displayed in grid mode.

Note on disabled buttons: When in GRID mode, you will not be able to select the DECIMAL or DEG buttons as they are disabled, although a tool tip will still appear when you hover the mouse over the button. You need to select LAT/LONG mode first, and then select either DECIMAL or DEG.