AIS Message Definitions

AIS Message: waterlevel (366:63:1)

Description:

Water level report. In this case from the NOAA Co-Ops 6 minute raw data

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.
waterlevel 16 sdecimal Water level in centimeters
stationloc_longitude 28 udecimal Location of the sensor taking the water level measurement or position of prediction East West location
stationloc_latitude 27 udecimal Location of the sensor taking the water level measurement or position of prediction North South location
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
timeSinceLastMeasured_month 4 uint Time since last measured value was available month 1..12
timeSinceLastMeasured_day 5 uint Time since last measured value was available day of the month 1..31
timeSinceLastMeasured_hour 5 uint Time since last measured value was available UTC hours 0..23
timeSinceLastMeasured_min 6 uint Time since last measured value was available minutes
timeSinceLastMeasured_sec 6 uint Time since last measured value was available seconds