The siteId on a FieldVisit determines which site's monitoring wells are available when adding FieldMeasurement records to the visit. Since multiple sites may be managed under one Piper account, siteId ensures that all water-level and field-parameter readings collected during this visit are attributed to the correct location. Select the correct site when creating the FieldVisit — misattributing a visit to the wrong site would cause water-level trend data to appear at the wrong location.
Technical section
Data model, API, and internals — visible to developers.