Inserting the TLM North Arrow element (Defense Mapping)

The TLM Defense North Arrow element is generated to match TLM specifications and represents the three ways of defining north:

• Grid north (GN)—The north established by using the vertical grid lines on the map.
• Magnetic north—The direction to the north magnetic pole, as indicated by the north-seeking needle of a magnetic instrument. It is symbolized by a line ending with half an arrowhead.
• True north—A line from any point on the earth's surface to the North Pole. All lines of longitude are true north lines. It is represented by a star at the end of a line.

Once inserted, double-clicking the TLM north arrow allows you to access the Defense North Arrow Properties dialog box. Clicking Symbol in the Appearance area of the Defense North Arrow Properties dialog box causes the North Arrow Text Symbol dialog box to appear, where you can modify the TLM north arrow text symbol.

See Modifying symbols and map elements to learn more about modifying the north arrow text symbol.

步骤:

1. Start ArcMap.
2. Verify that the map is in layout view.
3. On the main menu, click Customize > Toolbars > Defense Mapping.
4. On the Defense Mapping toolbar, click Defense Mapping > Surround Elements > TLM North Arrow.

   The north arrow is displayed in the map layout.

5. Double-click the north arrow.

   The Defense North Arrow Properties dialog box appears.

6. Click the Defense North Arrow tab.
7. If necessary, uncheck the Update dynamically check box.

   The UTM, G-M Angle, and Grid Convergence areas become editable.

8. Click the Date drop-down arrow to choose the declination date you want to use.

   Modifying the declination date (when the Update dynamically check box is unchecked) updates the G-M Angle values.

9. Click the Properties button next to the Zone field in the UTM area and perform the following steps to modify the UTM zone.

   Modifying the UTM Zone parameter (when the Update dynamically check box is unchecked) updates the Grid Convergence values.

   1. In the Spatial Reference Properties dialog box, expand Projected Coordinate Systems and navigate to the coordinate system you want to use.
   2. Click OK.

   The Defense North Arrow Properties dialog box appears.

10. Perform the following for both the G-M Angle and Grid Convergence area options:
    1. Click to choose West or East for your north arrow.
    2. Type or choose the number of degrees you want to use in the Degrees text box.
    3. Type or choose the number of minutes you want to use in the Minutes text box.
    4. Type or choose the value you want to use in the Mils text box.
11. Check the appropriate check boxes in the Coordinate Display area.
    • EAST/WEST Directional Notes—EAST or WEST text will be capitalized and added to both the G-M and G-T notes, for example, 1½° (30 MILS) WEST.
    • Leading Zeros for Minute Coordinates—Will display the leading zeros for G–C minutes.
    • Rounded G-M Angle Coordinates—G-M Angle is displayed to the nearest ½ degree, for example, 13 ½°; Mils is displayed to the nearest 10 Mils, for example, 240. If unchecked, then G-M Angle is displayed as degrees and minutes, for example, 13°41’; Mils is displayed to the nearest 1 Mil, for example, 243; and Leading Zeros will not be displayed for G-M minutes.
    • Rounded Mils—If unchecked, then Mils for both G-C and G-M will be shown in decimals, for example, 19.6. This option is disabled when the Rounded G-M Angle Coordinates check box is checked.
12. Click Symbol in the Appearance area to modify the north arrow text symbol.

    The North Arrow Text Symbol dialog box appears.

    注:

    The text defaults to Zurich BT. If you do not have the Zurich BT font installed, the text defaults to Arial.

13. Click any option in the Preview area or any tab and its associated options to modify the north arrow text symbol.
14. Click OK when you are finished.

    The Defense North Arrow Properties dialog box appears.

15. Click Large or Small in the Size area to determine the size of the north arrow.
16. Click Color in the Appearance area to modify the color for the north arrow.
17. Choose the color you want to use for the north arrow.
18. 单击确定。

The TLM North Arrow element is generated.