Labeling data with unit conversion

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

  1. Start ArcMap.
  2. On the main menu, click Customize > Toolbars > Labeling.
  3. Click the Label Manager button Label Manager on the Labeling toolbar.
  4. Check the box next to the layer you want to label.

    Optionally, select the layer and create label classes.

  5. Choose a label class under the layer.
  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 = ""
        set ipLabelHelper = CreateObject("ESRI.Production.Nautical.LabelHelperClass")
        set ipRounder = ipLabelHelper.GetUnitsRounder( [DEPTH_M_RR] )
        if ipRounder Is Nothing then
          FindLabel = ""
          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.