[GIS] Using Value from Iterate Feature Selection to Calculate Field in ArcMap ModelBuilder

arcgis-desktoparcmapfield-calculatoriteratormodelbuilder

I am using ArcMap 10.1.

I have two polygon feature classes, an alignment layer and a parcels layer. I am trying to use ModelBuilder to create a tool that will do the follow:

  1. iterate through groups in a single field of a polygon alignment layer (ie select and iterate through certain attributes in a field with same names such as "tunnel", "portal", etc)
  2. Clip a parcel layer by each group
  3. Populate a new field in the parcel layer called "EsmtType" with the name of each group (group is called "Value" in model)
  4. Merge the clipped groups into one feature class

I have gotten steps 1 and 2 to function but I am stuck on step 3. I am not sure how I need to configure the "Calculate Field" tool in order to recognize the "Value" variant of the "Iterate Feature Selection" tool. I tried using the advice from Using a value from "iterate feature selection' to calculate a field but I couldn't figure out how to implement it for my situation.

Here is the model I have thus far:
http://imgur.com/ji2nAJJ

I would also like advice on how to implement step 4, I am not sure if it would require integrating a model within a model.

Best Answer

I remember struggling with this in ModelBuilder as well, and the method I eventually came up with is this:

enter image description here

An expression is built using the Calculate Value tool with Value as an inline variable. It will return a string containing the current Value which can be used as the expression for the Calculate Field tool.

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