From 366cbbde50a2c3599f13d9a204b3c6a7fa679d4f Mon Sep 17 00:00:00 2001 From: Dan Howe Date: Mon, 16 Sep 2019 13:52:48 +1000 Subject: [PATCH] Add chart datum levels --- port-authority-nsw/README.md | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/port-authority-nsw/README.md b/port-authority-nsw/README.md index 145a288..4f05703 100644 --- a/port-authority-nsw/README.md +++ b/port-authority-nsw/README.md @@ -5,6 +5,23 @@ Download latest time series data from Port Authority of NSW and update local cop 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 |