SeaReport is a simple reporting tool designed to quickly generate clear, simple reports from Nortek instrument current data. The software can be downloaded from the Nortek software and firmware download page, and installation requires a valid license. If you are interested in purchasing the software, please contact your local Nortek sales representative.
SeaReport can be used with data files from the following Nortek instruments: Aquadopp, AWAC, Aquadopp Generation 2, AWAC Generation 2, and Signature
This article provides tips, tricks, and answers to frequently asked questions to help you make the most of the SeaReport software.
Where are the depth cells positioned in Seareport?
Top-depth and bottom-depth are extracted from the cells they are in, while a weighting for middle-depth takes place based on the two cells that are closest.
What noise floor is used during processing in SeaReport?
The noise floor, together with returned signal strength, is used to calculate SNR. The instrument noise floor is unique for each instrument and deployment. During processing in SeaReport, the noise floor values used are either those presented in the table below or the lowest reading of signal strength in the data set if it is lower than the table value.
| Instrument frequency | Noise floor (counts) |
| 2 MHz | 20 |
| 1 MHz | 20 |
| 600 kHz | 30 |
| 400 kHz | 30 |
How does SeaReport calculate tilt?
SeaReport uses values of pitch and roll to calculate tilt with the following formula:
| \begin{equation} \text{tilt} = \cos^{-1} \left( \cos(\text{pitch}) \cdot \cos(\text{roll}) \right) \end{equation} |
(1) |
What do the SeaReport Quality Codes mean?
When exporting data from SeaReport to an Excel report you get a Quality Control Code for each depth and time step. This code indicates which, if any, control algorithm has resulted in the data point being marked as bad. The code is bit-coded so that multiple algorithms can be indicated for one data point. Below is a list of the quality control codes and a description of the algorithm.
Bit 2: Instrument out of water (pressure check) - (0000 0000 0000 0100)
The pressure readings indicates that the instrument is out of water at the time of the measurement.
Bit 3: Instrument out of water (amplitude check) - (0000 0000 0000 1000)
The amplitude readings indicates that the instrument is out of water at the time of the measurement.
Bit 4: Low SNR - (0000 0000 0001 0000)
Removes measurements based on an acoustic signal that is too weak. The threshold value is set by the user when importing the data and specifies the minimum signal strength above noise level that validates the data.
Bit 5: Amplitude spike detected - (0000 0000 0010 0000)
Identifies and marks spikes in the current velocity that typically result from acoustic response from fish or other objects. The amplitude spike threshold is set by the user when importing the data..
Bit 6: Velocity spike detected - (0000 0000 0100 0000)
Removes deviant velocity measurements. The threshold value (set by the user when importing the data) is specified as a number of standard deviations from the mean.
Bit 7: Cell position out of range - (0000 0000 1000 0000)
The targeted cell is out of the range of the instrument.
Bit 8: Low pressure - (0000 0001 0000 0000)
Low pressure will tag data as invalid if the pressure is below the user specified threshold in dBar. This test will typically detect if the instrument has not been submerged in water.
Bit 9: High tilt threshold exceeded - (0000 0010 0000 0000)
Checks if the instrument is tilted more than the specified threshold.
Bit 10: Unexpected orientation - (0000 0100 0000 0000)
Checks that the instrument has the expected orientation. This will typically be used to remove data collected during the deployment and retrieval of the instrument. The expected orientation can be set to up or down.
Bit 11: Not used - (0000 1000 0000 0000)
-
Bit 12: Not used - (0001 0000 0000 0000)
-
Bit 13 : Low correlation - (0010 0000 0000 0000)
Removes measurements based on correlation that is too low. The threshold value is set by the user when importing the data and specifies the minimum correlation that is accepted to validate the data.
Updated