7.3 Data Compensation

Submersed Leveloggers measure total or absolute pressure (water column equivalent + barometric pressure). In order to accurately determine the true changes in water level only, Levelogger data must be barometrically compensated.

Levelogger data can be barometrically compensated using data from a local Barologger (one Barologger can cover all Leveloggers within a 20 mile / 30 km radius or per 1000 ft/300 m change in elevation) and the Barometric Compensation application in the STS/RRL Software (Version 1.1.1 or higher).

The Levelogger and Barologger must have the same time stamp in order for the compensation to be successful. Compensation simply involves subtraction of the barometric reading from the corresponding Levelogger reading.

To begin the compensation, click the Barometric Compensation tab on the STS/RRL Administrator Window.

Note:

Barometric Compensation of Levelogger data can also be performed using Levelogger Software’s Compensation Wizard.

STS data files can be exported using STS/RRL Software as *.lev files and opened in Levelogger Software for automatic compensation. See the Levelogger User Guide for more details.

Figure 7-11 Barometric Compensation Window

Note:

The Levelogger and Barologger must have the same time stamp in order for the compensation to be successful.

In the Barometric Compensation Window, from the “Enable Barometric Compensation” list, check the STS Site that you wish to compensate, and the STS Site (or RRL Station) that will provide the Barologger for the compensation. In the “Select Barologger from Site” section, select the STS Site (or RRL Station) that contains the Barologger you wish to use for the compensation, and identify the Barologger by its position (Logger ID) on the STS Site (or RRL Station).

To account for different altitudes in your compensation, enter the Altitude at which the Barologger is deployed. You will also enter the following for each connected Levelogger (does not apply for Rainloggers). If you do not enter these values, the Software will assume all altitudes to be 0 (sea level).

Click OK to complete the compensation.

To view the compensated data, click the Display Data tab on the STS/RRL Administrator Window. Check the sites that you wish to view from the list provided.

The data will be displayed in a table at the top of the window, the bottom portion of the window will show the data graphed. Data from each Levelogger is shown in a separate tab (identified by serial number). To view raw Levelogger data (uncompensated), uncheck “Show Compensated Data”.

The compensated data will be in the units that the Levelogger was programmed to record in. E.g.: if your Barologger was set to record in psi and your Levelogger was set to record in feet, the compensated data will automatically be converted to feet. A Barologger Edge or Barologger Gold can be used to compensate the data from any version of Levelogger.

 

Figure 7-12 View Compensated Data