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Tuesday, February 10th, 2026 – 9:00 am
The Out of Home Advertising Association of America (OAAA) has launched a significantly updated version of its OpenOOH venue taxonomy, a move poised to revolutionize programmatic buying in the digital out-of-home (DOOH) advertising sector. This initiative aims to dismantle the traditional, often opaque, method of categorizing DOOH inventory by broad venue types, such as "retail" or "transit." The revised taxonomy introduces a granular, hierarchical structure designed to provide programmatic buyers with the precise data they require to confidently bid on and integrate DOOH into their omnichannel campaigns, mirroring the sophistication already present in digital advertising.
The OAAA’s decision to enhance the OpenOOH taxonomy stems from a clear demand from programmatic buyers for greater transparency and specificity. For years, the industry has grappled with the limitations of generic classifications, which often obscured the true nature and quality of available ad space. When publishers and Supply-Side Platforms (SSPs) group media of varying quality under broad umbrellas, it not only erodes advertiser confidence but also acts as a significant deterrent for programmatic buyers looking to execute targeted campaigns. This latest iteration of the OpenOOH taxonomy, first introduced in 2020, directly addresses these long-standing challenges.
The development and ongoing maintenance of this crucial standard will now be managed by the OAAA Taxonomy Committee, which will absorb the dedicated OpenOOH Taxonomy Working Group that spearheaded the creation of the new specification last year. This consolidation signifies a commitment to the long-term evolution and adoption of the taxonomy across the industry.
Embracing Programmatic Precision for Omnichannel Integration
The imperative for a more programmatic-friendly OOH landscape is underscored by the evolving needs of advertisers. Premesh Purayil, CTO at OOH publisher OUTFRONT Media, articulated this need, stating, "Programmatic advertisers require a more streamlined approach to leverage OOH inventory as a seamless extension of their omnichannel campaigns, particularly when aligning with retail media and Connected TV (CTV) buys." The ability to precisely target OOH placements based on detailed venue attributes is essential for advertisers seeking to replicate the audience segmentation and targeting capabilities they have come to expect from other digital channels.
Anna Bager, President and CEO of the OAAA, echoed this sentiment, emphasizing the strategic advantage for OOH publishers. "By aligning OOH media classification more closely with programmatic buying practices, out-of-home publishers can effectively capitalize on the recent surge in programmatic CTV and retail media spend," she explained. This strategic alignment is critical for the continued growth and integration of OOH into the broader digital advertising ecosystem.
The OOH sector has demonstrated remarkable resilience and growth in recent years, a stark contrast to the challenges faced during the COVID-19 pandemic. According to OAAA data, the industry has experienced 18 consecutive quarters of ad revenue growth. This trend continued into the third quarter of 2025, with a notable 4.5% year-over-year improvement, during which advertisers invested a record $2.13 billion, the highest figure ever recorded for a third quarter. Despite this robust performance, a significant portion of OOH advertising revenue still originates from direct-sold deals. Open-auction programmatic, while growing, accounts for a comparatively smaller fraction of OOH ad spend. Bager attributed this disparity, in part, to the historical lack of granular detail in OOH inventory classification, which has prevented programmatic advertisers from achieving the level of precision they demand.
A Hierarchical Schema for Unprecedented Granularity
The cornerstone of the updated OpenOOH taxonomy is its introduction of a sophisticated "parent/children/grandchildren" schema. This hierarchical structure empowers media owners to classify their inventory with a level of detail that can be directly integrated into Open Real-Time Bidding (OpenRTB) bid requests.
For instance, a digital screen situated in an airport baggage claim area, which was previously relegated to the broad "transit" category, can now be precisely identified as "transit/airports/baggage claim." This level of specificity allows for highly targeted media buys, moving beyond generalized location categories to pinpoint exact environments within larger venues.
Purayil acknowledged that the previous OOH taxonomy did offer a "venueTypeString" field within OpenRTB, a free-text field that allowed for manual input of more detailed venue information. However, he highlighted the inherent limitations of such unstructured data. "Free text fields are notoriously difficult for programmatic systems to parse accurately," Purayil noted. "They are often applied inconsistently across different platforms, leading to ambiguity and potential errors in automated buying processes."
To address this critical issue, the new taxonomy deprecates the venueTypeString field, eliminating the guesswork and ensuring a standardized, machine-readable format for venue classification. This move is a significant step towards enabling more reliable and efficient programmatic transactions.
While the OAAA has spearheaded this development, the integration of these new OOH taxonomy standards into the broader OpenRTB specification and the deprecation of legacy fields are crucial for widespread adoption. AdExchanger reached out to the IAB Tech Lab, the governing body for OpenRTB, for comment on their plans to incorporate these advancements, but had not received a response by the time of publication. Industry observers anticipate a collaborative effort to ensure seamless integration and maximize the impact of the new taxonomy.
Democratizing Access and Enhancing Advertiser Control
The implications of this more granular classification system extend far beyond simple data enrichment; it promises to democratize access to OOH advertising for a wider range of advertisers and facilitate more strategic campaign planning.
"With more detailed categories, advertisers can zero in on the OOH inventory they want to use for omnichannel audience extension," Purayil explained. He offered a concrete example: "CPG brands, for instance, could target the specific types of stores where their products are actually sold, rather than relying on the undifferentiated ‘retail’ category." This allows for a more direct alignment between advertising spend and sales channels, enhancing campaign effectiveness.
Furthermore, the taxonomy provides advertisers with greater flexibility in determining the precise placement of their advertisements within venues. For example, a potato chip brand might opt for street-facing displays in the windows of local bodegas to capture impulse purchases, while a pharmaceutical brand might prefer screens located near pharmacy counters within drug stores, targeting consumers actively seeking health-related products. This level of nuanced control was previously unattainable with broader categorization.
The new taxonomy also addresses the challenge of "sorta CTV" OOH placements – digital screens, often found in bars or restaurants, that mimic the experience of CTV but may not offer the same audio capabilities or viewing environment. Purayil elaborated, "A brand whose CTV creative relies heavily on sound will likely prefer to bypass these environments. Conversely, a brand targeting sports fans with ad creative where audio is less critical might deliberately seek out ‘sorta CTV’ inventory to broaden their reach." By allowing advertisers to distinguish between these distinct environments, the taxonomy enhances targeting accuracy and avoids misallocation of budget.
This level of distinction directly benefits both buyers and sellers. Advertisers gain access to more relevant media placements, ensuring their messages resonate with the intended audience in the appropriate context. Publishers, in turn, can more effectively articulate the unique value proposition of their inventory, mitigating concerns that mismatched placements might negatively impact campaign performance.
Empowering Niche Publishers and Driving Open Marketplace Growth
Beyond enabling sophisticated targeting for large brands, the updated OpenOOH taxonomy holds significant promise for smaller, more niche OOH publishers. Purayil highlighted the inherent advantages enjoyed by large OOH platforms like OUTFRONT Media, stating, "Large OOH platforms have an edge because they are well-known to specialist agencies and possess established direct sales teams. Agency buyers understand how these larger networks organize their inventory and can plan accordingly." Smaller publishers, he noted, often lack this established market presence and direct access to agency planners.
However, by adopting the new, standardized taxonomy, smaller publishers can significantly enhance the programmatic activation of their inventory. This makes their offerings more accessible and attractive to programmatic buyers who may not have direct relationships with them.
The taxonomy also fosters a more unified programmatic buying experience across a diverse range of publishers, from large networks to smaller, independent operators. Advertisers can manage OOH buys as part of their broader omnichannel programmatic strategies, rather than relying exclusively on direct deals or private marketplace (PMP) arrangements.
"The revenue is already flowing heavily through the private marketplace side," Purayil observed. "But this could potentially shift some of that revenue into the open marketplace, if it proves to be a more efficient and effective channel for certain types of buys." This potential migration from PMPs to the open auction could lead to greater liquidity and more competitive pricing across the OOH programmatic landscape. The OAAA’s proactive approach with the OpenOOH taxonomy signals a strong commitment to fostering innovation and growth within the digital out-of-home advertising sector, positioning it for an even more integrated and impactful future in the digital media mix.
