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