The semi auto soil layer boundaries detection is based on a simple univariate statistical analysis of the qt profile of the selected CPT. Clicking on the 
button located at the toolbar the following dialog will appear:
Auto layers boundaries detection dialog
The software will try to locate soil layer boundaries based on the peaks of the T Ratio plot. The vertical red line in this plot presents a threshold value so that the application will know which peak values to peak. Peak values located to the right of the vertical line will be accepted and all others will be rejected. Obviously moving the line to the left of the plot more peaks will be included thus more soil layers boundaries will be identified. While moving the line the software will perform all the necessary calculations so the typical geotechnical section plot will always display the current soil stratigraphy.
Soil layers are filtered based on two (2) user defined parameters, minimum layer thickness and group together when average qt is less than a specific value. When group together is checked the software will check identical and successive layers if they meet this criteria and will present them as one.
The tabular results provide numeric results of the calculations along with a quick check that is based on the following rules:
•When less than 5% of the CPT points that form a layer have a SBTn number outside the overall SBTn of the layer, then this layer is considered to be ok (a green tick mark appears on the Check column)
•When 5% to 25% of the CPT points that form a layer have a SBTn number outside the overall SBTn of the layer, then this layer is considered to be less consistent (a yellow triangle mark appears on the Check column)
•When more than 25% of the CPT points that form a layer have a SBTn number outside the overall SBTn of the layer, then this layer is not considered to be ok (a red circle mark appears on the Check column)
The Code column in the table is editable so the user can change the Code name if needed.
The statistical analysis is based on a window with a fixed width that moves from the top of the CPT profile to the bottom. The width is calculated based on the number of points (a default value of 30 is used) that can be changed using the track bar. Large number of points mean a smoother T Ratio plot, so less peaks will be displayed where less points result to a large number of peaks.
Clicking the OK button the software will ask if it should replace any previous geotechnical section with the current one. The user may review and make any changes using the manual geotechnical section design module at any time.
