# 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           |