Water level report. This is DRAFT/PROPOSED message format and should not be considered any sort of standard. The main goal is to illustrated the Tide Aware ENC and the AIS XML engine.
Note:This is based on discussions with the NOAA PORTS group. 2nd generation water level message prototype
See Also:http://opendap.co-ops.nos.noaa.gov/axis/
See Also:http://vislab-ccom.unh.edu/~schwehr/software/noaadata/ais-messages/waterlevel.html
See Also:http://http://vislab-ccom.unh.edu/~schwehr/ais/waterlevel/
See Also:http://co-ops.nos.noaa.gov/corms.html
| Name | NumberOfBits | ArrayLength | Type | Units | Description |
|---|---|---|---|---|---|
| MessageID | 6 | uint | AIS message number. Must be 8 | ||
| RepeatIndicator | 2 | uint | Indicated how many times a message has been repeated 0: default 3: do not repeat any more |
||
| UserID | 30 | uint | Unique ship identification number (MMSI) | ||
| Spare | 2 | uint | Reserved for definition by a regional authority. | ||
| dac | 10 | uint | Designated Area Code | ||
| fid | 6 | uint | Functional Identifier | ||
| month | 4 | uint | Time the measurement represents month 1..12 | ||
| day | 5 | uint | Time the measurement represents day of the month 1..31 | ||
| hour | 5 | uint | Time the measurement represents UTC hours 0..23 | ||
| min | 6 | uint | Time the measurement represents minutes | ||
| stationid | 6 | 7 | aisstr6 | Character identifier of the station. Usually a number. | |
| waterlevel | 16 | int | cm | Water level in centimeters | |
| datum | 5 | uint | What reference datum applies to the value 0: MLLW 1: IGLD-85 2: WaterDepth 3: STND 4: MHW 5: MSL 6: NGVD 7: NAVD 8: WGS-84 9: LAT 10: Pool 11: Gauge 31: Unknown/Unavailable |
||
| sigma | 7 | uint | cm | Standard deviation of 1 second samples used to compute the water level height. FIX: is this the correct description of sigma? | |
| source | 3 | uint | How the water level was derived 0: No data 1: Realtime sensor data 2: Raw realtime sensor data - no validation 3: Predicted water level - tidal data generated by using harmonic analysis 4: Forecast water level - tidal data generated by use of a hydrodynamic model 5: Reserved 6: Reserved 7: Reserved |