Privacy and standards
DOOH Measurement Standards: IAB, MRC, and Geopath
DOOH measurement standards: IAB guidance and OpenRTB, MRC independent accreditation, and Geopath/Nielsen/Route currency — why they matter for trust and budget.
18 min readUpdated
DOOH Measurement Standards: IAB, MRC, and Geopath
DOOH measurement standards make it possible to answer “who was reached, by how many, with how much attention” in a shared language across digital out-of-home advertising. This article maps the standards landscape — IAB’s measurement guidance and OpenRTB, MRC’s independent accreditation, and currency providers such as Geopath, Nielsen, and Route — and explains why these standards are critical for trust and budget.
Why are DOOH measurement standards needed?
Before allocating budget to a channel, advertisers want assurance that impressions on that channel are defined consistently and comparably. DOOH was fragmented on this front for a long time: different networks counted impressions differently and modelled audiences differently. Standards reduce that fragmentation by introducing common definitions, common metrics, and independent verification, so that budget can flow with confidence.
It helps to think of the standards landscape in three roles: those who set guidance and frameworks (IAB), those who grant independent accreditation (MRC), and those who provide the trading currency in the market (Geopath, Nielsen, Route). These three layers complement one another.
IAB: measurement guidance and OpenRTB
The IAB (Interactive Advertising Bureau) produces technical frameworks and guidance for digital advertising (iab.com). On the DOOH side, two contributions stand out.
The first is measurement guidance. IAB’s DOOH measurement guide tracks the industry’s maturation of the impression definition from the concept of OTS (Opportunity-to-See) toward LTS (Likelihood-to-See) — that is, from a coarse count like “opportunity to see” to a measure that accounts for attention, like “likelihood to see.” IAB guidance also explicitly anticipates AI camera and sensor-based audience detection and offers a framework for how such measurements should be reported.
The second is OpenRTB. IAB Tech Lab’s OpenRTB 2.6 defines a dedicated dooh object and an imp.qty.multiplier field for programmatic DOOH; this multiplier expresses how many billable impressions a single play corresponds to and can take a fractional value (for example 14.2 or 0.32). This lets a single screen play be priced programmatically according to the measured audience size. You can find more on how OpenRTB works in DOOH in the article on currency and measurement.
MRC: independent accreditation
The MRC (Media Rating Council) is the body that independently audits and accredits measurement systems. While IAB sets definitions and frameworks, MRC answers the question “does this measurement really work as it claims” through an independent CPA audit. The accreditation process is typically long and costly: it can take approximately 6–18 months and may require an investment in the high six figures (USD).
MRC’s OOH accreditation is advancing in phases. Phase 1 took effect in April 2024 and excluded audience measurement; that is, it focused on basic impression and delivery metrics. The Phase 2 — Audience draft (approximately 2025) addresses the rules for audience measurement and is currently being written. This means the rules for how camera-based and modeled audience measurement will be accredited are still maturing.
This timeline carries a practical message: independent accreditation standards in DOOH measurement are actively evolving, so it is meaningful to ask whether a provider is “accredited” and against which phase.
Currency providers: Geopath, Nielsen, Route
The third layer is the currency providers the market references for buying and selling. These tie how many people a screen reaches to a standard measure, so that parties can discuss budget through a common unit.
- Geopath is the established OOH currency provider in the United States.
- Nielsen, with its long media-measurement history, offers measurement across various channels including OOH.
- Route is the OOH audience measurement system in the United Kingdom.
An important and honest note: most of these established currency providers rely on modeling the audience rather than measuring it directly with cameras. That is, they estimate “who passed by” statistically from mobile-location and panel data; “who actually looked” is most often not measured directly. This difference between modeled and measured is addressed in the article on modeled vs measured and is one of the most fundamental distinctions in DOOH measurement today.
Roles of the bodies: a summary table
| Body | Type | Primary role | Contribution in DOOH |
|---|---|---|---|
| IAB / IAB Tech Lab | Framework & technical standard | Guidance, common definitions, OpenRTB | DOOH measurement guide (OTS→LTS); dooh object + imp.qty.multiplier |
| MRC | Independent accreditation | Auditing and accrediting measurement systems | OOH Phase 1 (Apr 2024, excludes audience); Phase 2 — Audience draft (~2025) |
| Geopath | Currency provider (US) | OOH audience currency | Mostly modeled audience estimation |
| Nielsen | Measurement/currency provider | Multi-channel media measurement | Modeled measurement including OOH |
| Route | Currency provider (UK) | OOH audience measurement | Mostly modeled audience estimation |
This table shows that “standard” is not a single thing: setting a framework, accrediting, and providing currency are distinct functions, and a healthy ecosystem needs all three.
How do standards unlock trust and budget?
The practical effect of standards is on budget. When an advertiser sees that impressions are measured against a common definition, that the measurement can be independently audited, and that the result can be tied to a currency, they allocate budget to the channel more comfortably and at greater scale. Conversely, where measurement is not transparent, budget stays cautious. This is why measurement infrastructure is the lock that unlocks budget in DOOH; you can find the whole picture in the article on DOOH audience measurement.
In this landscape, privacy-first, computer-vision-based measurement providers (such as Mecrai) aim to fill the “who actually looked” gap left by modeled currencies with anonymous, aggregate camera-measurement data; however, such measurement finding its full place in the industry depends on accreditation rules like MRC Phase 2 maturing.
Summary
DOOH measurement standards are organised around three roles: IAB establishes the common language with frameworks and OpenRTB, MRC audits trust through independent accreditation, and Geopath/Nielsen/Route provide currency to the market. This structure is still maturing — particularly on the audience-measurement side — and the evolution of these standards is a direct determinant of trust and budget in DOOH.
Frequently asked questions
- What is the difference between IAB and MRC?
- IAB produces common definitions, measurement guidance, and technical standards such as OpenRTB for digital advertising. MRC accredits those measurements through an independent audit. In short, IAB sets the framework, while MRC answers whether a measurement really works as claimed.
- Does MRC OOH accreditation cover audience measurement?
- Not fully yet. Phase 1, which took effect in April 2024, excluded audience measurement. The rules for audience measurement are addressed under Phase 2 — Audience, which was in draft form around 2025 and is currently being written.
- Do Geopath and Route measure audiences with cameras?
- Generally no. Most established currency providers such as Geopath (US) and Route (UK) rely on modeling the audience from mobile-location and panel data. That means estimating "who passed by" statistically; direct camera measurement is typically not used.
- What is the OpenRTB multiplier?
- The `imp.qty.multiplier` defined in OpenRTB 2.6 is the factor expressing how many billable impressions a single DOOH play corresponds to. It can take a fractional value (for example 14.2 or 0.32), so a screen play can be priced programmatically according to the measured audience size.
Related articles
Privacy and standards
KVKK/GDPR and DOOH: Data Privacy on Digital Screens
DOOH data privacy under GDPR and KVKK: the legal line between anonymous, aggregate measurement and processing personal data on digital screens.
14 min read
Privacy and standards
Privacy-by-Design Measurement: Anonymous and On-Device
Privacy-by-design measurement explained: the 6 principles of anonymous, on-device DOOH measurement that stores no image and creates no identity.
16 min read
DOOH fundamentals
cornerstoneWhat Is DOOH? A Guide to Digital Out-of-Home Advertising
What is DOOH? A clear guide to digital out-of-home advertising — its definition, how it differs from print OOH, where screens live, and why it's measurable.
15 min read