Intimacy measures include for example the discussion over  topics that are indicative of a closer connection to a given person.

Augustana College (IL)

Example of survey item measuring tie strength from the Census's 2017 Civic Supplemental Survey.  Strength of a tie is also known as intensivity, which attempts to capture frequency and quality of interaction with another tie, related to the four dimensions that Granovetter espoused 

https://www.census.gov/data/datasets/2017/demo/cps/cps-civic.html

Measurement

Amount of Time

Intimacy 

Measures can include frequency at which one does favors for a friend or neighbor

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