Symbology / Legend Order for No Value Features

[sgambrel_Bouldercounty]

Hello,

I have a web map that shows the FEMA-regulated Floodplain in my community.  In the FEMA data, there is a Zone Subtype field that is used to classify features in the commonly-used categories of Floodway / 100-Year Floodplain / 500-Year Floodplain.  This field has values for Floodway and 100-year Floodplain, but no value for 100-Year Floodplain. 

I can symbolize each of these categories distinctly, however because the 100-Year Floodplain is "No Value", it doesn't seem that I can re-order it in the legend to show up where it logically should, between Floodway and 500-Year Floodplain. 

I also do not appear to be able to suppress the "Area of Minimal Flood Hazard" - basically everything NOT regualted floodplain -  from showing up on the legend.  This does not need to be on the legend.

Is there any way to remedy this?  The current layer list / legend looks ridiculous as-is.   See the screenshot below for an illustration.   

  
Two notes:  The source of this data is a REST mapservice; I am using the "0" layer.  I don't think there's any flexibility in this.  Also, both FEMA and ESRI host this data which is somehow correctly symbolized, but I cannot use that as we have modified the FEMA data slightly, as we consider all floodplain above a certain elevation to be floodway.

 

[Laura]

You should be able to drag the Area of Minimal Flood Hazard down to the other area and uncheck it - will disappear from legend. Also your symbols style is set to 3 colors (classes) change it to include 4 and your other one should be in that main list. 

[sgambrel_Bouldercounty]

That doesn't work and is precisely the issue.  "No Value" is in this case a legitamite value, for the 100-year floodplain.  The Map Viewer insists on putting No Value ar the bottom.  You can see that it is not moveable because it doesn't have the dotted handle at the left.  Likewise, the Area of Minimal Risk cannot be dragged below No Value, and dragging it "into" it groups it with the 100-Year Floodplain. 

 

[Laura]

Can you post a link to the FEMA data here?

The 6 dots left to Area of Minimal Risk should allow you to drag it below. Did you try changing the symbol style as stated above to see if that resolved any issues?

[sgambrel_Bouldercounty]

https://maps.bouldercounty.org/arcgis/rest/services/HAZARD/FLOODPLAIN_FEMA_REGULATED/MapServer/0

The Zone Subtype Field is the one that is used for the 3 commonly used zones.

[Laura]

Sorry but that says restricted access. You may need to send the link from the direct source. 

[sgambrel_Bouldercounty]

I woried that might happen...  Here's a Feature Layer made from that REST endpoint:

https://arcg.is/rWyf8

[Laura]

Ah ok I see. I can't edit but have you tried populating those fields that are listed as no value with 100 yr?

[sgambrel_Bouldercounty]

Unfortunately I am not allowed to do so.  It's important for us to keep the classifications consistent with the source data, from FEMA. 

The issue truly is about being able to manipulate "no value" features.

[Laura]

You're not going to be able to 'drag it up' until it has a value. All you can do without 'altering' the data would be to change the label. Can you add another column and duplicate the data and edit it from there?

You could also look into using the FLD_Zone field and looking at your A, AE values.