Where they went

Radio presence and device exposure

Counts of the devices near each screen, read from the signals nearby phones and other devices broadcast (Bluetooth, mDNS, SSDP and HTTP probes): distinct devices, returning devices, devices also seen at another screen, dwell and exposure seconds, per screen, hour and signal. A co-presence table lines each five-minute radio count up with the camera reading beside it, and device-level files list every play or window by device, on a device key salted for your company.

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The question it answers

How many devices were near this screen, how long did they stay, and did they come back?

5,633

radio screens, 28 days

1,163

radio screens with no camera

2.4 million

screen-hours by signal

Measured over the 28 days to October 11, 2026.

The dataset

Grain: Hourly.
Cadence: Hourly rows, one file per day.
History: From May 24, 2026.
Format: Parquet or JSONL.
Delivered to: Your S3 bucket, your GCS bucket, or a time-limited download link, with a manifest and a schema.
Method: How each measure is produced and how to add rows up: the measurement methodology.

What buyers do with it

Reach and frequency at device level, per screen and hour.
Visit, dwell and return rates for venues.
Audience counts at screens that carry radio and no camera.

The tables

Read from the export registry each time this site is built.

`device_exposure_hourly`

Hourly, from May 24, 2026

Radio exposure per screen, hour and signal: distinct, returning and cross-screen devices, dwell and attention seconds.

Grain: One row per hour, screen_mongo_id and source.
Delivery: One file per day, as Parquet or JSONL.
Basis: Measured.
Definition: Version 3.

Column	Type	What it holds
`hour`	timestamp	UTC hour the 6-minute exposure slots of the row started.
`screen_mongo_id`	string	Trillboards screen id (24-character hex); joins dim_screen.screen_id.
`source`	string	Radio signal source: ble, wifi, mdns, ssdp or http_probe.
`visitor_source`	integer	1 when the source is one the canonical visitor count uses (ble, mdns, ssdp, http_probe), 0 for wifi. Visitor headline counts sum the rows with 1.
`n_windows`	integer	Exposure windows: one per device key, screen, source and 6-minute slot. Unit: exposure_windows.
`unique_devices`	integer	Distinct device keys (the canonical visitor id) seen at the screen in the hour on the source. Unit: identifiers.
`returning_devices`	integer	Of those, the keys seen at this screen on an earlier day (30-day look-back). Unit: identifiers.
`cross_screen_devices`	integer	Of those, the keys that also appear at another screen (cross_screen_transitions). Unit: identifiers.
`total_dwell_seconds`	integer	Sum over the windows of each window's dwell (first to last sighting in the slot). Unit: seconds.
`attention_windows`	integer	Windows whose slot carried a camera attention value. Through 2026-09-23 a slot no camera window covered carried none; from 2026-09-24 the windower writes 0 for such a slot, so every window counts. Unit: exposure_windows.
`total_attention_seconds`	integer	Sum over those windows of the slot's camera attention seconds (the slot's high or medium attention camera windows times their length); every window of a slot carries the slot's value. From 2026-09-24 a slot no camera covered counts 0. Unit: seconds. Null: No window of the row carried a camera attention value (through 2026-09-23: no camera window covered its slots).
`p50_dwell_seconds`	integer	Exact median dwell of the windows. Unit: seconds.
`p90_dwell_seconds`	integer	Exact 90th-percentile dwell of the windows. Unit: seconds.

`screen_hourly_presence`

Hourly, from June 24, 2026

Grain: One row per hour_start, screen_mongo_id and evidence_grade.
Delivery: One file per day, as Parquet or JSONL.
Basis: Measured.
Definition: Version 2.

Column	Type	What it holds
`hour_start`	timestamp	Start of the UTC hour. The hour of the 5-minute radio bucket.
`screen_mongo_id`	string	Trillboards screen id (24-character hex); joins dim_screen.screen_id.
`evidence_grade`	string	Grade (face_backed or person_backed) of the latest camera window that closed within 15 s of a bucket of the row.
`unique_devices`	integer	Distinct canonical visitor keys (BLE, mDNS, SSDP, HTTP probe) in the screen-hour's buckets that had a camera window within 15 s. Unit: identifiers.
`observation_windows`	integer	Distinct (visitor key, 5-minute bucket) pairs. Unit: device_buckets.
`face_present_windows`	integer	Of those, the pairs whose camera window read at least half a face. Unit: device_buckets.
`attention_high_windows`	integer	Of those, the pairs whose camera window qualifies under the published attention rule. Unit: device_buckets.
`total_radio_pings`	integer	Radio pings of the visitor keys in those buckets (each key and bucket's largest cluster size, capped at 255). Unit: pings.

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