Research Panel audit

Each poster site is visited by an independent team of surveyors to determine its particular characteristics. Photographs are taken and up to 245 separate measures are logged. All physical characteristics of the site are measured together with its precise location to the nearest metre. The data is required not just to confirm the physical existence of the panel but to calculate the visibility adjustment to derive its potential audience.

The surveying is undertaken by the firm of Longdin & Browning.