Water level report. In this case from the NOAA Co-Ops 6 minute raw data. Bit aligning with AIS packet size has not yet been done. 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/
| Name | NumberOfBits | ArrayLength | Type | Description |
|---|---|---|---|---|
| dac | 16 | uint | Designated Area Code | |
| fid | 4 | uint | Functional Identifier | |
| efid | 12 | uint | extended functional identifier | |
| timetag_month | 4 | uint | Time the measurement represents month 1..12 | |
| timetag_day | 5 | uint | Time the measurement represents day of the month 1..31 | |
| timetag_hour | 5 | uint | Time the measurement represents UTC hours 0..23 | |
| timetag_min | 6 | uint | Time the measurement represents minutes | |
| timetag_sec | 6 | uint | Time the measurement represents seconds | |
| stationid | 6 | 7 | aisstr6 | Character identifier of the station. Usually a number. |
| stationloc_longitude | 28 | decimal | Location of the sensor taking the water level measurement or position of prediction East West location | |
| stationloc_latitude | 27 | decimal | Location of the sensor taking the water level measurement or position of prediction North South location | |
| waterlevel | 16 | int | 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: MLS 6: NGVD 7: NAVD |
|
| sigma | 32 | float | 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_month | 4 | uint | Time since last measured value was available month 1..12 | |
| timeLastMeasured_day | 5 | uint | Time since last measured value was available day of the month 1..31 | |
| timeLastMeasured_hour | 5 | uint | Time since last measured value was available UTC hours 0..23 | |
| timeLastMeasured_min | 6 | uint | Time since last measured value was available minutes | |
| timeLastMeasured_sec | 6 | uint | Time since last measured value was available seconds |