Water level report. In this case from the NOAA Co-Ops 6 minute raw data. 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:Prototype only for the Hampton Roads/Elizabeth River 2007 demonstration project
See Also:http://opendap.co-ops.nos.noaa.gov/axis/
See Also:http://http://vislab-ccom.unh.edu/~schwehr/ais/waterlevel/
| 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 | ||
| efid | 12 | uint | extended 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 | ||
| sec | 6 | uint | Time the measurement represents seconds | ||
| stationid | 6 | 7 | aisstr6 | Character identifier of the station. Usually a number. | |
| longitude | 28 | decimal | degrees | Location of the sensor taking the water level measurement or position of prediction. East West location | |
| latitude | 27 | decimal | degrees | Location of the sensor taking the water level measurement or position of prediction. North South location | |
| 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 |
||
| sigma | 32 | float | m | Standard deviation of 1 second samples used to compute the water level height | |
| o | 8 | uint | Count of number of samples that fall outside a 3-sigma band about the mean | ||
| levelinferred | 1 | bool | indicates that the water level value has been inferred | ||
| flat_tolerance_exceeded | 1 | bool | flat tolerance limit was exceeded. Need better descr | ||
| rate_tolerance_exceeded | 1 | bool | rate of change tolerance limit was exceeded | ||
| temp_tolerance_exceeded | 1 | bool | temperature difference tolerance limit was exceeded | ||
| expected_height_exceeded | 1 | bool | either the maximum or minimum expected water level height limit was exceeded | ||
| link_down | 1 | bool | Unable to communicate with the tide system. All data invalid | ||
| timeLastMeasured | 12 | udecimal | hours | Time relative since the timetag that the station actually measured a value. |