| # Quality report (review sample) |
|
|
| Scope: the four sessions in this sample (days 1, 8, 13 and 15). Sections 1 to 5 restate numbers from the paper and |
| from the dataset's existing quality-assurance runs over the whole window. Section 6 was computed fresh from the files |
| of this sample and is marked as such. |
|
|
| ## 1. Sessions |
|
|
| | day | weekday | type | hours | node-hours | live tracks | occupancy level | |
| |---:|---|---|---:|---:|---:|---| |
| | 1 | Tue | term weekday | 19.0 | 133.0 | 3,200 (from day 2 02:09 UTC only) | -- (partial) | |
| | 8 | Tue | low-occupancy weekday | 19.0 | 133.0 | 9,454 | moderate | |
| | 13 | Sun | weekend | 15.0 | 105.0 | 7,000 | moderate | |
| | 15 | Tue | term weekday | 19.0 | 133.0 | 25,763 | busy | |
|
|
| Occupancy level is set by the 90th percentile of live tracks present in the session: quiet up to 20, busy above 85, |
| moderate in between. Each session ran from opening to 07:00 UTC the next day. All times in this report are UTC |
| (shifted); a session's day number is the day it started. |
|
|
| ## 2. Recording completeness (recorder manifest and archive verifier) |
|
|
| | day | nodes with frames | share of the span with all 7 nodes | single-node outages | restarts | verifier findings | |
| |---:|---|---:|---:|---:|---| |
| | 1 | 7 / 7 | 0.999997 | 0 | 0 | none (exit code 0) | |
| | 8 | 7 / 7 | 0.999998 | 0 | 0 | none (exit code 0) | |
| | 13 | 7 / 7 | 0.999995 | 0 | 0 | none (exit code 0) | |
| | 15 | 7 / 7 | 0.999997 | 0 | 0 | none (exit code 0) | |
|
|
| Intervals per node are in `metadata/recorder/<session>/verification_findings.json` (frames less than 1 s apart form |
| one interval). |
|
|
| ## 3. Live tracklets (whole-window tracklet QA) |
|
|
| | day | verdict | reason | |
| |---:|---|---| |
| | 1 | FAIL | the live log starts at day 2 02:09:46 UTC (25 % of the session span), after the benchmark walk; see section 5 | |
| | 8 | WARN | nearest-node share of sightings under N5 is 0.4 % against a median of 4.0 %; an occupancy effect of the low-occupancy period (the east seating is nearly empty), not node loss: every node recorded at full rate | |
| | 13 | WARN | nearest-node share under N7 is 4.6 % against a median of 9.7 %; weekend occupancy, as above | |
| | 15 | PASS | - | |
|
|
| Across all 21 live sessions, 7 tracks in about 306,000 show a sustained jump faster than 4 m/s, all while coasting; one |
| of them is on day 15 at 15:40:36 UTC. Frame stamps are near-monotonic, and no live log has a gap longer than 5 minutes |
| inside a session. |
|
|
| Known properties of the live tracklets: |
| - The live tracker restarts daily at 11:05 UTC; there are no frames from about 10:50 to 11:05 UTC, and track IDs |
| restart at every restart. Key tracks by (tracker run, id). |
| - The live tracker ran at 2.5 Hz after its restart and slowed to 1.3 to 1.8 Hz by evening on the busiest days. A lost |
| moving track coasts about 8 s at 2.5 Hz and about 15 s at 1.3 Hz. |
| - Live tracks last a median of about 35 s, because a person who stays an hour is often carried by several tracks. |
|
|
| ## 4. Experimental flicker flags |
|
|
| The filter flags tracks born at a few fixed spots that coast for most of their life and barely move. It writes flags |
| and deletes nothing; the raw tracklets are the default. Whole-session counts from the run over all 21 sessions |
| (the filter counts each session's track set with its own boundary convention, so totals can differ by one from |
| section 1): |
|
|
| | day | tracks | flagged | |
| |---:|---:|---:| |
| | 1 | 3,201 | 436 | |
| | 8 | 9,454 | 2,561 | |
| | 13 | 7,001 | 1,538 | |
| | 15 | 25,764 | 2,323 | |
|
|
| Validation against manual headcounts: in the busy benchmark session the median number of tracks present moves from 88 |
| to 87 with the flags applied, against a headcount of about 85 (toward it); in the quiet session from 9 to 8, against |
| about 9 (away from it). The moderate session has no live log and no headcount. The filter is experimental and not |
| accepted as a correction. |
|
|
| ## 5. Benchmark sessions |
|
|
| | level | session day, time (UTC) | tracks present | walked | live rate | |
| |---|---|---|---:|---| |
| | quiet | Sun, day 13, 16:02-16:41 | about 9 | 940 m | 2.5 Hz | |
| | moderate | Tue, day 1 (day 2 00:39-01:26) | about 70 | 932 m | 1.3 Hz (replayed) | |
| | busy | Tue, day 15, 17:30-17:55 | median 88 | 940 m | 2.5 Hz | |
|
|
| Reference results (walker-level; IDSW = ID switches per 100 m; Seat = seated stops after which the walker kept the ID): |
|
|
| | level | tracker | MOTA* | IDF1 | IDSW | Seat | |
| |---|---|---:|---:|---:|---:| |
| | quiet | live (2.5 Hz) | 0.97 | 0.93 | 0.32 | 6/6 | |
| | quiet | offline (10 Hz) | 0.99 | 0.97 | 0.21 | 5/6 | |
| | moderate | live (1.3 Hz, replayed) | 0.93 | 0.75 | 1.07 | 2/6 | |
| | moderate | offline (10 Hz) | 0.99 | 0.95 | 0.43 | 4/6 | |
| | busy | live (2.5 Hz) | 0.88 | 0.75 | 1.38 | 2/6 | |
| | busy | offline (10 Hz) | 0.94 | 0.85 | 0.85 | 1/6 | |
|
|
| A manual headcount during the busy session found about 85 people in the room. In the busy session two walkers walked |
| the four routes concurrently. The benchmark windows are tagged in `sessions.csv` and should be excluded from analyses |
| of everyday behavior. |
|
|
| The moderate session predates the live tracklet logger, so its live tracklets are the live tracker replayed on the |
| recorded clouds at the live tick cadence; route B, also walked that evening, is not a benchmark route. |
|
|
| ## 6. This sample (computed fresh from the package files) |
|
|
| Computed by the sample build from the files of this package (not numbers from the paper). Times are UTC. |
|
|
| **Tracklet files** |
|
|
| | file | tracker frames | track rows | distinct tracks | median rate | first - last (UTC) | |
| |---|---:|---:|---:|---:|---| |
| | `track_log/tracks_day8_000000.jsonl.gz` | 213,688 | 2,781,569 | 10,617 (tracker run, id) | 2.50 Hz | 03:59:59 - 03:59:59 (next day) | |
| | `track_log/tracks_day15_000000.jsonl.gz` | 165,373 | 8,312,597 | 26,452 (tracker run, id) | 2.08 Hz | 03:59:59 - 03:59:58 (next day) | |
| | `benchmark/busy/tracks_final_5hz.csv.gz` | 7,494 | 692,019 | 1,572 ids | 5.00 Hz | 17:30:00 - 17:54:59 | |
| | `benchmark/busy/tracks_live_day15_133000.jsonl.gz` | 3,901 | 342,792 | 1,040 (tracker run, id) | 2.50 Hz | 17:30:00 - 17:55:59 | |
| | `benchmark/quiet/tracks_final_5hz.csv.gz` | 13,440 | 138,404 | 418 ids | 5.00 Hz | 16:00:10 - 16:44:59 | |
| | `benchmark/quiet/tracks_live_day13_120200.jsonl.gz` | 6,000 | 53,333 | 254 (tracker run, id) | 2.50 Hz | 16:02:00 - 16:41:59 | |
| | `benchmark/moderate/tracks_final_5hz.csv.gz` | 19,489 | 1,429,730 | 2,811 ids | 5.00 Hz | 00:30:00 - 01:34:59 | |
| | `benchmark/moderate/tracks_live_replayed_day1_203900.csv.gz` | 3,738 | 279,667 | 1,193 ids | 1.30 Hz | 00:39:00 - 01:26:59 | |
|
|
| The offline files in `offline/` are byte-identical copies of the benchmark offline files; each covers the whole offline |
| run, and `window.json` gives the benchmark window. |
|
|
| **Point-cloud windows** |
|
|
| | window | nodes | segments | frames (all nodes) | points | bytes | |
| |---|---:|---:|---:|---:|---:| |
| | `clouds/geo_day8_080011` (19:00:00-20:00:00 UTC) | 7 | 49 | 254,899 | 990,441,953 | 11.89 GB | |
| | `benchmark/busy/clouds/geo_day15_080014` (17:30:00-17:56:00 UTC) | 7 | 28 | 110,610 | 474,966,718 | 5.70 GB | |
| | `benchmark/quiet/clouds/geo_day13_120009` (16:02:00-16:42:00 UTC) | 7 | 35 | 169,778 | 635,130,164 | 7.62 GB | |
| | `benchmark/moderate/clouds/geo_day1_080012` (00:39:00-01:27:00 UTC) | 7 | 42 | 203,979 | 856,542,452 | 10.28 GB | |
|
|
| **Flicker flags in this sample:** 5,775 flags of tracks born in the sample's live data (`metadata/flicker/flags.tsv`). |
|
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