Publication errors can include ads that were not aired or were aired for a shorter duration than planned. Other examples include equipment malfunctions resulting in black screens or color discrepancies, or when the ad display is obstructed.

OTC stands for Opportunity to Contact, which refers to the probability of reaching the audience within the visible area of outdoor advertising. Miaozhen combines real-time LBS data, proprietary ad visibility models, time probability models, scene-based algorithms, and foundational research data to calculate audience reach for outdoor advertising.

To measure the audience, clients provide the planned outdoor advertising locations and schedules (pre-buy).

Using historical LBS data, the audience measurement product calculates and provides the corresponding reach curve. Supported outdoor media types include building ads (elevator ads, indoor ads), outdoor billboards, LED displays on building exteriors, bus shelters, subway stations, airports, high-speed train stations, and train stations. The system also supports the merging of multiple media types for combined calculations.

Currently, the visible areas are defined using a relatively fixed selection method based on media types. Most cases do not require manual intervention, as long as the system can accurately identify the location.

For example, for media types like airports, subway stations, and buildings with indoor advertisements, the proprietary outlines are used as the default visible range.

For some special locations (primarily outdoor billboards), the visible range may be adjusted based on specific information such as billboard height and position. Once confirmed, the system will use the adjusted range as the default.