I have a tank age data set which I would like to present on ArcGIS.
I would like to represent the different tanks using their tank age. I would like the symbol colour to be dependent on the tank age (think red, green, yellow).
The problem is, there are some tanks which I don't have the tank age for.
How can I represent the tanks that don't have tank age?
- Put in the tank age as 'N' to give it a character input
- I can't put a dummy number such as -9999 since I have other graphical representations that rely on that age field and -9999 would skew the charts.
Edit: - I could create a different column for Null_values and ask the symbology to draw off that. I'm unsure if we can represent one symbology from different fields. - Grey of blank would be a great visual but I'm not sure how to map off the NULL data.