topic Re: ArcGIS Pro 3.1.2 - How to create variable with all features in Arcade? in ArcGIS Pro Questions

ArcGIS Pro 3.1.2 - How to create variable with all features in Arcade?

VincentLaunstorfer — Wed, 05 Jul 2023 16:07:49 GMT

Hi,

I have an Arcade expression in which I would like to look through all features for calculation.

I start my expression as:

var Zoning = FeatureSetByName($layer,["City"],true);

I would like to use the variable 'Zoning' to loop in order to calculate in each $feature using the 'City' attribute and the geometry (hence 'True')

In Arcade, I though I could simply point to the current layer using $layer but it does not work!

For info, I am using this Arcade expression in Calculate Field in Model Builder and I cannot easily reference the $datastore name as it is dynamic.

Any help appreciated

Re: ArcGIS Pro 3.1.2 - How to create variable with all features in Arcade?

JohannesLindner — Wed, 05 Jul 2023 19:06:44 GMT

FeaturesetByName() asks for a Featureset Collection. $layer is a Featureset (the Featureset that the current $feature belongs to).

To loop through each feature in the current layer, you can just use the $layer global like this:

for(var f in $layer) { // do something with f }

Re: ArcGIS Pro 3.1.2 - How to create variable with all features in Arcade?

VincentLaunstorfer — Thu, 06 Jul 2023 16:00:33 GMT

Fantastic!

I will try that. I knew there was something easy.

Appreciated

Re: ArcGIS Pro 3.1.2 - How to create variable with all features in Arcade?

VincentLaunstorfer — Thu, 17 Aug 2023 15:09:47 GMT

Hi,

Finally, I am trying to use the $layer global variable to loop through all features in order to sum acreage per cities. The Arcade expression makes an initial distinct list of cities in the $layer and then calculates acreage acreage accordingly for each $feature, as follow:

but I still get an:

Invalid expression.
Error on line 3.
Object not found $layer

For info, I am using this Arcade expression in Calculate field tool.

Any guess?

Re: ArcGIS Pro 3.1.2 - How to create variable with all features in Arcade?

VincentLaunstorfer — Fri, 18 Aug 2023 08:11:13 GMT

I think I found out the reason why global variable $layer gives an Object not found error.

In Field Calculation profile, only $feature and $datastore can be used in Aracde. Not $layer.

https://developers.arcgis.com/arcade/profiles/field-calculation/

As I use this this Arcade expression in Field Calculation in ModelBuilder with a dynamic feature class name, I have no chance to re-use the ModelBuilder variable pointing to my feature class in the Arcade script...

Never mind, I will perform my calculation differently.