cowin/README.md

cowin — auto-generated data guide

Auto-generated on 2026-10-08T15:45:30+08:00 by scripts/generate_processed_readmes.py from the files actually present in this directory. Do not edit by hand — re-run the generator (or scripts/flatten_hko_data.py) after the data changes.

Overview

• Files: 3
• Total rows: 576,471
• Total size: 2292.6 KB
• Sources: hk_cowin
• Time coverage: 2023-01-01 00:00:00 .. 2025-12-31 23:00:00
• Join keys: use station_id / station_code to join to the station metadata table in this or the hko section; use the time column shown per file for temporal joins.

Files

cowin_hourly_rainfall.parquet

• Format: parquet · Rows: 549,702 · Columns: 6 · Size: 373.0 KB
• Purpose: HKU CoWIN QC hourly rainfall
• Source: hk_cowin
• Time coverage (obs_time_hkt): 2023-01-01 00:00:00 .. 2025-12-31 23:00:00
• station_id: 40 distinct

Column	Type	Non-null	Range / values	Description
obs_time_hkt	str	549702/549702 (100%)	2023-01-01 00:00:00 .. 2025-12-31 23:00:00	observation time (end of the 1-hour rainfall window)
station_id	str	549702/549702 (100%)	40 distinct; e.g. "6003"	AWS/CoWIN station identifier
rain_mm_1h	float64	549698/549702 (100%)	range 0 .. 249.5	rainfall in the past hour (mm)
qcscore	str	549702/549702 (100%)	values: G, M, F, X	CoWIN quality-control flag (G = good; M/F/X = flagged)
year	int64	549702/549702 (100%)	range 2023 .. 2025	year
source	str	549702/549702 (100%)	values: hk_cowin	source dataset identifier

cowin_labels_rainstorm_hourly.csv

• Format: CSV · Rows: 26,295 · Columns: 8 · Size: 1899.7 KB
• Purpose: CoWIN-based rainstorm-hour labels
• Time coverage (hour_end_hkt): 2023-01-01 00:00:00 .. 2025-12-31 23:00:00

Column	Type	Non-null	Range / values	Description
hour_end_hkt	str	26295/26295 (100%)	2023-01-01 00:00:00 .. 2025-12-31 23:00:00	hour-ending timestamp (HKT)
any_station_amber	bool	26295/26295 (100%)	True / False	TRUE if any CoWIN station (QC=G) reached 30 mm/h
any_station_red	bool	26295/26295 (100%)	True / False	TRUE if any CoWIN station (QC=G) reached 50 mm/h
any_station_black	bool	26295/26295 (100%)	True / False	TRUE if any CoWIN station (QC=G) reached 70 mm/h
n_amber	int64	26295/26295 (100%)	range 0 .. 14	number of stations reaching 30 mm/h
n_red	int64	26295/26295 (100%)	range 0 .. 8	number of stations reaching 50 mm/h
n_black	int64	26295/26295 (100%)	range 0 .. 5	number of stations reaching 70 mm/h
label_basis	str	26295/26295 (100%)	values: any_cowin_station_qc_G	rule used to build the label (e.g. any_cowin_station_qc_G)

cowin_stations.parquet

• Format: parquet · Rows: 474 · Columns: 20 · Size: 19.9 KB
• Purpose: HKU CoWIN station metadata
• Source: hk_cowin
• station_id: 164 distinct

Column	Type	Non-null	Range / values	Description
station_id	str	474/474 (100%)	164 distinct; e.g. "1005"	AWS/CoWIN station identifier
station_name	str	473/474 (100%)	155 distinct; e.g. "Hon Wah College"	station name
latitude	float64	473/474 (100%)	range 22.21 .. 22.55	requested station latitude
longitude	float64	473/474 (100%)	range 113.9 .. 114.3	requested station longitude
elevation	float64	86/474 (18%)	range 3.3 .. 151.8	station elevation (m)
Jan	str	90/474 (19%)	values: Y	field
Feb	str	88/474 (19%)	values: Y	field
Mar	str	90/474 (19%)	values: Y	field
Apr	str	84/474 (18%)	values: Y	field
May	str	86/474 (18%)	values: Y	field
Jun	str	83/474 (18%)	values: Y	field
Jul	str	80/474 (17%)	values: Y	field
Aug	str	84/474 (18%)	values: Y	field
Sep	str	87/474 (18%)	values: Y	field
Oct	str	88/474 (19%)	values: Y	field
Nov	str	86/474 (18%)	values: Y	field
Dec	str	88/474 (19%)	values: Y	field
year	float64	473/474 (100%)	range 2023 .. 2025	year
source	str	474/474 (100%)	values: hk_cowin	source dataset identifier
metadata_missing	object	1/474 (0%)	values: True	TRUE when a rainfall station has no row in CoWIN available.csv