card

README.md

@@ -10,13 +10,14 @@ tags:
   - hong-kong
   - geoparquet
 size_categories:
-  - 100K<n<1M
+  - 1M<n<10M
 ---
 
 # Hong Kong road network
 
 Hong Kong's road network from the Transport Department's Intelligent Road Network (2nd generation): every layer and every
-field of its file geodatabase; and the Lands Department's Road Centreline (1:1000 topography), for alignment with LandsD's other
+field of its file geodatabase; its Traffic Aids Drawings (2nd generation: traffic signs, traffic lights, road markings, yellow
+boxes, crossings, railings, tactile paving, direction and pedestrian signs), every layer and every field; and the Lands Department's Road Centreline (1:1000 topography), for alignment with LandsD's other
 1:1000 data. Rebuilt weekly by [AlreadyOpen/hk-roads](https://github.com/AlreadyOpen/hk-roads).
 
 One Parquet file per layer (GeoParquet, `geometry` as WKB in EPSG:4326, every attribute as text exactly as published):
@@ -37,9 +38,36 @@ One Parquet file per layer (GeoParquet, `geometry` as WKB in EPSG:4326, every at
 | `tun_bridge_toll.parquet`, `tun_bridge_tv_toll.parquet` | tunnel and bridge tolls, fixed and time-varying (tables, no geometry) |
 | `landsd_road_centreline_hk1980.parquet` | **Lands Department** Road Centreline: street centre lines from the 1:1000 topographic map, with street name (EN/TC), code and type. Geometry in **HK1980 Grid (EPSG:2326)**, the coordinates as the CSDI service returns them (on a 1/16 m grid), for aligning with iB1000/iRG1000 and other LandsD 1:1000 data |
 | `landsd_road_centreline.parquet` | the same lines in EPSG:4326 |
+| `traffic-aids/<layer>.parquet` | **Traffic Aids Drawings**: one file per layer of `dTAD_IRNP.gdb`, named as the layer in lower case (below) |
+
+Traffic Aids Drawings layers (TD's drawing of every traffic aid; most carry `ELEVATION` (level), `COMPLETION_DATE`, `GAZETTE_DATE`,
+`LAST_UPD_DATE`; sign layers carry `SIGNID`/`POLEID` and `GG_NAME`):
+
+| Layer (`dtad_...`) | What |
+|---|---|
+| `traffic_light_pt`, `traffic_light_line`, `traffic_light_filled` | traffic signals: position and angle, and their drawn symbol |
+| `crossing_line`, `ped_refuge_line` | crossings (`LINETYPE`), pedestrian refuges with design and measured size |
+| `yl_box_poly`, `yl_box_line` | yellow boxes (`YELLOWBOX_TYPE`, angles) and their hatching |
+| `rd_mark_line`, `rd_mark_line_c` | road markings (`COLOR`, `LINETYPE`) and their symbolised representation (pattern, width, offset) |
+| `rd_mark_anno` | road marking text (annotation: `TextString` and its placement) |
+| `rd_mark_sym_pt`, `rd_mark_sym_line` | road marking symbols (`REFNAME`, angle, size) |
+| `railing_line`, `rd_al_line`, `drop_kerb_line`, `run_in_out_line` | railings, special road alignment, dropped kerbs, run-ins/outs |
+| `tw_strip_line`, `tg_path_line`, `ty_bar_line` | tactile warning strips, tactile guide paths, transverse yellow bars |
+| `ts_pole_pt`, `ts_pole_line`, `ts_plate_line`, `ts_abv_pt`, `ts_abv_line`, `ts_abv_anno`, `ts_misc_line`, `ts_filled` | traffic signs: poles, plates (drawn), abbreviations and their text |
+| `ds_*`, `ps_*` | direction signs and pedestrian (and tourist) signs: poles, plates, text (`ps_anno`), fills |
+| `gipole_pt`, `cyc_pt`, `misc_pt` | GI poles, cycling signs, other signs |
+| `rst_zone_line`, `lv21_line` ... `lv38_line`, `lv22_filled` | restriction zones (`TIME_ZONE`) and the drawing levels 21-38 |
+| `unknown_line` | lines TD has not classified |
+
+Layer names are the geodatabase's (TD's data spec and its GML/KML copies call the annotation layers `*_ANNO_PT`). `dtad_lv24_line` and `dtad_ps_filled`
+are not in the geodatabase: they come from TD's CityGML copies of the same dataset (`DTAD_LV24_LINE.gml`, `DTAD_PS_FILLED.gml`).
+Every feature is kept, including the few without geometry (geometry null; `index.json` counts them under `aids.no_geometry`).
+The data revision cut-off date (TD's `DATA_LAST_UPDATED_DATE.csv`) is in `index.json` (`aids.revised`).
 
 Curved geometries in the source (arcs) are turned into lines. Vector tiles of the geometry layers for web maps (PMTiles,
-z8-16, one tile layer per Parquet file name; the LandsD centreline in its own `landsd-centreline.pmtiles`, z12-16) are in the bucket
+z8-16, one tile layer per Parquet file name; the traffic aids in `traffic-aids.pmtiles`, z16-18 only (street detail: the densest
+z16-17 tiles are thinned to fit, z18 holds every feature; zoom past 18 to see them larger); the LandsD centreline in its own
+`landsd-centreline.pmtiles`, z12-16) are in the bucket
 [alreadyopen/hk-roads](https://huggingface.co/buckets/alreadyopen/hk-roads).
 
 ```python
@@ -51,7 +79,8 @@ A copy is mirrored to [Kaggle](https://www.kaggle.com/datasets/helenkwok/hk-road
 
 ## Source and terms
 
-Data from the Government of the Hong Kong SAR, Transport Department, via [DATA.GOV.HK](https://data.gov.hk/en-data/dataset/hk-td-tis_15-road-network-v2),
+Data from the Government of the Hong Kong SAR, Transport Department, via DATA.GOV.HK ([Road Network](https://data.gov.hk/en-data/dataset/hk-td-tis_15-road-network-v2),
+[Traffic Aids Drawings](https://data.gov.hk/en-data/dataset/hk-td-tis_16-traffic-aids-drawings-v2)),
 used under the [DATA.GOV.HK Terms and Conditions](https://data.gov.hk/en/terms-and-conditions). The Government owns the
 intellectual property rights in the data. This dataset is derived from it, provided as is with no warranty, and not endorsed
 by the Government.