Labeling data with unit conversion (Maritime Charting)

You can display values in labels with the appropriate rounding rule applied.

步骤:

1. Start ArcMap.
2. On the main menu, click Customize > Toolbars > Labeling.
3. 在标注 工具条上单击标注管理器按钮 。
4. 选中想要标注的图层旁边的方框。

   （可选）选择该图层并创建图层分类。

5. 选择图层下方的标注分类。
6. Click Expression.
7. From the Label Expression dialog box, enter or load the appropriate label expression.

   The following is an example of an expression to apply a rounding rule for labeling. You may have to replace DEPTH_M and DEPTH_M_RR with the field names that apply to your label.

   Function FindLabel ( [DEPTH_M], [DEPTH_M_RR] ) 
     if ISNULL( [DEPTH_M_RR] ) then
       FindLabel = ""
     else
       set ipLabelHelper = CreateObject("ESRI.Production.Nautical.LabelHelperClass")
       set ipRounder = ipLabelHelper.GetUnitsRounder( [DEPTH_M_RR] )
       if ipRounder Is Nothing then
         FindLabel = ""
       else
         set ipValue = ipRounder.Round( [DEPTH_M] )
         FindLabel = "<CLR red='1' green='1' blue='1'><BOL><FNT name=""Arial"" size=""12"">" &  ipValue.IntegerString & "</FNT><FNT name=""Arial"" size=""15""><SUB>" & ipValue.FractionalString & "</SUB></FNT></BOL></CLR>"
       end if
     end if
   End Function
   

8. Click Verify to make sure there are no syntax errors and click OK.
9. Click OK to close the Label Manager dialog box.

   Features are labeled with the appropriate rounding rule applied to the destination field. If unit destination values are updated, the appropriate rounding is reapplied for the labels.