Map scale in Arcade labels

Question

I'd like to be able to include the current map scale in the labels for a feature in Portal 10.5.1. The documentation on this page suggests that only the feature to be labelled is available as a global variable in Arcade expression

https://developers.arcgis.com/arcade/guide/profiles/#labelling

However within the playground section on the same site the current map scale is available under the labelling profile

If I try to use the map scale global in an Arcade label expression on a layer in a Portal 10.5.1 web map I get an error about the view identifier not being found.

I'm guessing that the reason it works in the playground is that the page is built with the JS API and that has a slightly different implementation of Arcade than Portal 10.5.1 perhaps? My question is will the map scale global be available in later versions of Portal?

Anonymous User · Answer

Xander,

Thank you for the reply and idea, I may just try that for this particular case. I will keep an eye out for future Arcade solutions as well. Thanks!

XanderBakker · Answer

Hi jschuckert_InterwestGIS ,

As you already have noticed, this is not yet possible. Although there is an idea: Scale-based symbology and labeling in AGOL , but you already found and up-voted that idea (so did I just now).

The only thing I can think of at this moment is to duplicate the layer, each with its own label expression and scale dependency. So when you zoom in, for instance layer1 becomes visible (layer2 is not) and shows the larger label text and when you zoom out layer2 becomes visible with the shorter labels (and layer1 will switch off).

However, it is a great use case and it would be great to have this functionality in the Arcade label profile!

Anonymous User · Answer

I would like to access map scale in order to create label classes for a hosted feature layer in Portal. So for example, if below x scale label "xyz" if above x scale label just "xy". It looks like there is access to map scale for symbology purposes, although not for labels is this correct? Any thoughts would be greatly appreciated!