In ArcGIS (Arcmap 10.3.1), I would like to change the 'Value' column for one item in my symbology key, as there is a spelling mistake (see picture). How can I do this? (Without deleting the row and creating a new one.)
The value is incorrect in your underlying data, not just in your symbology. To correct this properly and not just work-around it with a different label, you will need to modify the value in your data. It appears that the incorrect value is in your
To modify this value, first you need to select all instances of that value in your layer, and then use field calculator to populate with the correct value.
Select all instances of value:
Open your attribute table (right-click on layer and select Open Attribute Table) and click on the Select by Attributes
SELECT * FROM <layer name> WHERE:box enter
rock_class = 'Metasedimenary'
rock_classis the name of your field and
Metasedimenaryis the value you want to select). Click Apply and Close. You should now see your rows selected in the table.
Right-click on your
rock_classfield and select Field Calculator
In the field calculator window enter the value you want to change the values in your selected features to:
Click OK to run the calculation and close the field calculator. You will now see that the selected values have been updated to your new correct value.
You will now need to update your symbology (as it will still be trying to symbolise on the old value that no longer exists). In your layer symbology tab you can either Remove All and then Add All Values - this will possibly reset all your symbol colours - or you can selectively remove the incorrect values by just selecting the problem values and clicking "Remove" and then click "Add" and add the new correct values in from the selection.
You can select that value in your table, and using field calculator, change it into the correct spelling. Then when you use that field in your symbology, the spelling will be correct