• Jump to:
• Preliminary Water Level
• Verified Water Level
• Hourly Height
• High Low
• Daily Mean
• Monthly Mean
• One Minute Water Level
• Tide Predictions
• Air Gap
• Wind
• Air Pressure
• Air Temperature
• Visibility
• Humidity
• Water Temperature
• Conductivity
• Salinity
• Currents

What do the letters in the data columns represent? There is a different set of columns returned for different types of data.

Preliminary Water Level

Field	Description
t	Time - Date and time of the observation
v	Value - Measured water level height
s	Sigma - Standard deviation of 1 second samples used to compute the water level height
f	Data Flags - in order of listing: -- (O) Count of number of 1 second samples that fall outside a 3-sigma band about the mean -- (F) A flag that when set to 1 indicates that the flat tolerance limit was exceeded -- (R) A flag that when set to 1 indicates that the rate of change tolerance limit was exceeded -- (L) A flag that when set to 1 indicates that either the maximum or minimum expected water level height limit was exceeded
q	Quality Assurance/Quality Control level -- p = preliminary -- v = verified

Verified Water Level

Field	Description
t	Time - Date and time of the observation
v	Value - Measured water level height
s	Sigma - Standard deviation of 1 second samples used to compute the water level height
f	Data Flags - in order of listing: -- (I) A flag that when set to 1 indicates that the water level value has been inferred -- (F) A flag that when set to 1 indicates that the flat tolerance limit was exceeded -- (R) A flag that when set to 1 indicates that the rate of change tolerance limit was exceeded -- (T) A flag that when set to 1 indicates that either the maximum or minimum expected water level height limit was exceeded
q	Quality Assurance/Quality Control level -- p = preliminary -- v = verified

Hourly Height

Field	Description
t	Time - Date and time of the observation
v	Value - Measured water level height
s	Sigma - Standard deviation of 1 second samples used to compute the water level height
f	Data Flags - in order of listing: -- (I) A flag that when set to 1 indicates that the water level value has been inferred -- (L) A flag that when set to 1 indicates that either the maximum or minimum expected water level height limit was exceeded

High Low

Field	Description
t	Time - Date and time of the observation
v	Value - Measured water level height
ty	Type - Designation of Water level height. HH = Higher High water, H = High water, L = Low water, LL = Lower Low water
f	Data Flags - in order of listing: -- (I) A flag that when set to 1 indicates that the water level value has been inferred -- (L) A flag that when set to 1 indicates that either the maximum or minimum expected water level height limit was exceeded

Daily Mean

Field	Description
t	Time - Date and time of the observation
v	Value – Mean hourly data over a 24 hour period
f	Data Flags - in order of listing: -- (I) A flag that when set to 1 indicates that the water level value has been inferred -- (L) A flag that when set to 1 indicates that either the maximum or minimum expected water level height limit was exceeded

Monthly Mean

Field	Description
year	Year
month	Month
highest	Highest Tide
MHHW	Mean Higher-High Water
MHW	Mean High Water
MSL	Mean Sea Level
MTL	Mean Tide Level
MLW	Mean Low Water
MLLW	Mean Lower-Low Water
DTL	Mean Diurnal Tide Level
GT	Great Diurnal Range
MN	Mean Range of Tide
DHQ	Mean Diurnal High Water Inequality
DLQ	Mean Diurnal Low Water Inequality
HWI	Greenwich High Water Interval (in Hours)
LWI	Greenwich Low Water Interval (in Hours)
lowest	Lowest Tide
inferred	A flag that when set to 1 indicates that the water level value has been inferred

One Minute Water Level

Field	Description
t	Time - Date and time of the observation
v	Value - Measured water level height

Tide Predictions

Field	Description
t	Time - Date and time of the observation
v	Value - Predicted water level height

Air Gap

Field	Description
t	Time - Date and time of the observation
v	Value - Measured air gap
s	Sigma - Standard deviation of 1 second samples used to compute the air gap
f	Data Flags - in order of listing: -- (O) Count of number of 1 second samples that fall outside a 3-sigma band about the mean -- (F) A flag that when set to 1 indicates that the flat tolerance limit was exceeded -- (R) A flag that when set to 1 indicates that the rate of change tolerance limit was exceeded -- (A) A flag that when set to 1 indicates that either the maximum or minimum expected air gap limit was exceeded

Wind

Field	Description
t	Time - Date and time of the observation
s	Speed - Measured wind speed
d	Direction - wind direction in degrees
dr	Direction - wind direction in text
g	Gust - Measured wind gust speed
f	Data Flags - in order of listing: -- (X) A flag that when set to 1 indicates that the maximum wind speed was exceeded -- (R) A flag that when set to 1 indicates that the rate of change tolerance limit was exceeded

Air Pressure

Field	Description
t	Time - Date and time of the observation
v	Value - Measured air pressure
f	Data Flags - in order of listing: -- (X) A flag that when set to 1 indicates that the maximum expected air pressure was exceeded -- (N) A flag that when set to 1 indicates that the minimum expected air pressure was exceeded -- (R) A flag that when set to 1 indicates that the rate of change tolerance limit was exceeded

Air Temperature

Field	Description
t	Time - Date and time of the observation
v	Value - Measured air temperature
f	Data Flags - in order of listing: -- (X) A flag that when set to 1 indicates that the maximum expected air temperature was exceeded -- (N) A flag that when set to 1 indicates that the minimum expected air temperature was exceeded -- (R) A flag that when set to 1 indicates that the rate of change tolerance limit was exceeded

Visibility

Field	Description
t	Time - Date and time of the observation
v	Value - Measured visibility
f	Data Flags - in order of listing: -- (X) A flag that when set to 1 indicates that the maximum expected visibility was exceeded -- (N) A flag that when set to 1 indicates that the minimum expected visibility was exceeded -- (R) A flag that when set to 1 indicates that the rate of change tolerance limit was exceeded

Humidity

Field	Description
t	Time - Date and time of the observation
v	Value - Measured humidity
f	Data Flags - in order of listing: -- (X) A flag that when set to 1 indicates that the maximum expected humidity was exceeded -- (N) A flag that when set to 1 indicates that the minimum expected humidity was exceeded -- (R) A flag that when set to 1 indicates that the rate of change tolerance limit was exceeded

Water Temperature

Field	Description
t	Time - Date and time of the observation
v	Value - Measured water temperature
f	Data Flags - in order of listing: -- (X) A flag that when set to 1 indicates that the maximum expected water temperature was exceeded -- (N) A flag that when set to 1 indicates that the minimum expected water temperature was exceeded -- (R) A flag that when set to 1 indicates that the rate of change tolerance limit was exceeded

Conductivity

Field	Description
t	Time - Date and time of the observation
v	Value - Measured conductivity
f	Data Flags - in order of listing: -- (X) A flag that when set to 1 indicates that the maximum expected conductivity was exceeded -- (N) A flag that when set to 1 indicates that the minimum expected conductivity was exceeded -- (R) A flag that when set to 1 indicates that the rate of change tolerance limit was exceeded

Salinity

Field	Description
t	Time - Date and time of the observation
s	Salinity
g	Specific Gravity

Currents

Field	Description
t	Time - Date and time of the observation
s	Speed - Measured current speed
d	Direction - current direction in degrees
b	Bin number

Currents Prediction

Field	Description
Time	Time - Date and time of the current prediction
Velocity_Major	Velocity along major axis
meanEbbDir	ebb direction in degrees
meanFloodDir	flood direction in degrees
Bin	Bin number
Depth	Bin depth
Speed	Speed - predicted current speed
Direction	Direction - current direction in degrees