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# port_authority_nsw.py
Download latest time series data from Port Authority of NSW and update local copy.
[wavewindtide.portauthoritynsw.com.au](http://wavewindtide.portauthoritynsw.com.au/)
Only one observation is available at any given moment. This script must be run regularly to obtain a complete time series.
## Chart datum levels
Water level observations are reported in chart datum. The offsets from AHD are below:
| Location | Chart zero (m AHD) | Stations |
|----------|-------------------:|-------------------------------------------|
| Sydney | -0.925 | Brotherson Emergency Response Jetty Tide |
| | | Caltex (Directional) Current |
| | | Fort Denison-Primary (Nth end) Tide |
| | | Fort Denison-Secondary (Vegapuls64) Tide |
| | | Circular Quay ADCP Current |
| | | Balls Head Current |
| | | |
| Yamba | -0.895 | Middle Wall (Vegapulse WL61) Tide |
| | | Goodwood (Vegapulse WL61) Tide |
## Station locations
| ID | Description |
|----|-------------------------------------------|
| 02 | Offshore (Directional) Wave |
| 03 | Bombora (Directional) Wave |
| 04 | Captain Cook Channel (SG) Wave |
| 05 | Kurnell (SG) Wave |
| 06 | Molineaux Point Wind |
| 07 | Sydney Airport (Main Runway BOM) Wind |
| 08 | Brotherson Emergency Response Jetty Tide |
| 09 | Caltex (Directional) Current |
| 12 | Western Wedding Cake Wind |
| 13 | Fort Denison (Sth end BOM) Wind |
| 14 | Overseas Passenger Terminal Wind |
| 15 | Glebe Island Wind |
| 16 | Fort Denison-Primary (Nth end) Tide |
| 17 | Fort Denison-Secondary (Vegapuls64) Tide |
| 18 | Circular Quay ADCP Current |
| 19 | Balls Head Current |
| 22 | Twofold Bay - Munganno Point Wave |
| 23 | Twofold Bay - Multipurpose Wharf Wind |
| 24 | Breakwater Wharf Wind |
| 27 | Middle Wall (Vegapulse WL61) Tide |
| 28 | Goodwood (Vegapulse WL61) Tide |