Table 3. Data attributes of acoustic Doppler current profiler data files revised to a column-oriented format.
| Column label |
Data attribute |
| Easting |
The adjusted easting position of the velocity measurement, referenced
to the North American Datum of 1983 (NAD 83) State Plane Coordinate system
for the southern zone of Michigan (2113), in international feet. (Equation
8). |
| Northing |
The adjusted northing position of the velocity measurement, referenced
to the North American Datum of 1983 (NAD 83) State Plane Coordinate system
for the southern zone of Michigan (2113), in international feet. (Equation
8). |
| Depth |
The depth below the water surface of the velocity measurement, in feet. |
| VelMag |
The magnitude of the measured water velocity, in feet per second. |
| VelAzmAdj |
The adjusted direction of water velocity, which is positive when measured
clockwise from zero degrees north (along the positive y-axis. (Equation
9). |
| VelEastAdj |
The easting component of water velocity, in feet per second. (Equation
10). |
| VelNrthAdj |
The northing component of water velocity, in feet per second. (Equation
10). |
| VelUp |
The upward component of water velocity, in feet per second. |
| Latitude |
The latitude of the velocity measurement, in decimal degrees. In the
data file, a value of 30.000000 indicates that the global positioning
signal was not recorded. |
| Longitude |
The longitude of the velocity measurement, in decimal degrees. Note,
a value of -30.000000 indicates that the global positioning signal was
not recorded. |
| BotDep |
The distance between the water surface and the bottom of the river,
in feet. |
| Discharge |
The flow (discharge of water) through the subarea defined by the flow
velocity and area, in cubic feet per second. |
| TimeTotal |
Cumulative time since the beginning of the ADCP measurement, in seconds. |
| L2R |
An indicator of the direction in which the transect was measured. A
value of 1 (logical true) indicates that the transect was measured from
the left-to-right across the river (looking downstream), and is zero otherwise.
|
| VelAzmMea |
The measured azimuth of the flow velocity, unadjusted for magnetic declination.
The azimuth is positive when measured clockwise from zero degrees north
(along the positive y-axis). |
| VelError |
An estimator of the precision of the velocity measurement, in feet per
second. |
| BackScat |
The percent of the original acoustic signal that is scattered back to
the ADCP unit. Backscatter is sometimes related to the amount of suspended
material in the water column. |
