| # `cedd` — 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:** 2 | |
| - **Total rows:** 98,730 | |
| - **Total size:** 149.3 KB | |
| - **Sources:** cedd_geo | |
| - **Time coverage:** 2023-01-01 00:00:00 .. 2025-12-31 00:00:00 | |
| - **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 | |
| ### `cedd_daily_rainfall.parquet` | |
| - **Format:** parquet · **Rows:** 98,640 · **Columns:** 10 · **Size:** 145.9 KB | |
| - **Purpose:** HKO CIS daily total rainfall | |
| - **Source:** cedd_geo | |
| - **Time coverage (`date`):** 2023-01-01 00:00:00 .. 2025-12-31 00:00:00 | |
| - **station_id:** 90 distinct | |
| | Column | Type | Non-null | Range / values | Description | | |
| |---|---|---|---|---| | |
| | `date` | str | 98640/98640 (100%) | 2023-01-01 00:00:00 .. 2025-12-31 00:00:00 | observation date | | |
| | `station_id` | str | 98640/98640 (100%) | 90 distinct; e.g. "H01" | AWS/CoWIN station identifier | | |
| | `station_name` | str | 98640/98640 (100%) | 61 distinct; e.g. "Mount Davis" | station name | | |
| | `easting` | int64 | 98640/98640 (100%) | range 804276 .. 855431 | field | | |
| | `northing` | int64 | 98640/98640 (100%) | range 802763 .. 842003 | field | | |
| | `value_raw` | str | 98640/98640 (100%) | 676 distinct; e.g. "0" | original value exactly as received (may be 'M' or 'Trace') | | |
| | `rain_mm_1d` | float64 | 97692/98640 (99%) | range 0 .. 622.5 | daily total rainfall (mm) | | |
| | `is_trace` | bool | 98640/98640 (100%) | True / False | TRUE when the raw rainfall value is 'Trace' (< 0.05 mm) | | |
| | `is_incomplete` | bool | 98640/98640 (100%) | True / False | field | | |
| | `source` | str | 98640/98640 (100%) | values: cedd_geo | source dataset identifier | | |
| ### `cedd_stations.csv` | |
| - **Format:** CSV · **Rows:** 90 · **Columns:** 5 · **Size:** 3.4 KB | |
| - **Purpose:** HKO station metadata | |
| - **Source:** cedd_geo | |
| - **station_id:** 90 distinct | |
| | Column | Type | Non-null | Range / values | Description | | |
| |---|---|---|---|---| | |
| | `station_id` | str | 90/90 (100%) | 90 distinct; e.g. "H01" | AWS/CoWIN station identifier | | |
| | `station_name` | str | 90/90 (100%) | 61 distinct; e.g. "Mount Davis" | station name | | |
| | `easting` | int64 | 90/90 (100%) | range 804276 .. 855431 | field | | |
| | `northing` | int64 | 90/90 (100%) | range 802763 .. 842003 | field | | |
| | `source` | str | 90/90 (100%) | values: cedd_geo | source dataset identifier | | |