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- Close: This tab acts like a button and closes the control panel. The control panel can be opened again by clicking any of the other four tabs.
- Shift Cores: This tab has controls for depth shifting, which are described in the Depth shift cores section.
- Splice Cores: This tab has controls for splicing, which are described in the Construct the splice section.
- Display Preferences: This tab has general data display controls (Fig. 2.2-2)and is described below.
- Data Filters: This tab offers data filtering options, including decimate, smooth and cull (Fig. 2.2-3)., and is described below.
Data Filters tab
Correlator offers three fundamental options to filter the data for the purpose of displaying them (Fig. 2.2-2a3a). The original data are still kept in memory and can be displayed, either in addition to the filtered data, or again by deleting the filtersfilter.
To filter the data:
- Select the data type you want to filter (Fig. 2. 2-2b3b).
- To decimate the selected data type, click the Edit button in the Decimate area (Fig. 2.2-2c3c).
- Enter a number in the Show every <N> points to limit the display to every Nth data point.
- Click the Apply button.
- To smooth the selected data type, click the Edit button in the Gaussian Smoothing area (Fig. 2.2-2d3d).
- Select the type of rolling window: Points or Depth (cm).
- Enter the Width in points or cm.
- Select the Display option: Smoothed only or Original & Smoothed
- Note: you can change the color of the smoothed trace in the Display Preferences > Set Colors
- Click the Apply button
- Select the type of rolling window: Points or Depth (cm).
- To cull the selected data type, click the Edit button in the Cull area (Fig. 2.2-2e3e). You have to cull type options:
- The first type of cull is to Cull data from sample edges.
- Enter the interval in cm in Cull <x> cm from core tops.
- The second type is to Cull outliers.
- Enter a value for Cull data values > x
- Enter a value for Cull data values < x
- Click the Apply button.
- The first type of cull is to Cull data from sample edges.
Figure 2. 2-23. Three data filtering options on the Data Filter tab: Decimate, Gaussian Smoothing, and Cull. Shown is a 9-point Gaussian filter applied to the magnetic susceptibility data whereby both original and smoothed (white trace overlay) are plotted. The filters can be edited or deleted.
a
b c
d
e
c 
d 
e 
Note:
- Data filters are applied to the data from all cores for a specified data type. For a more specific filtering of known intervals with severe core disturbance, etc., you have the option to apply a file with those intervals specified in the Correlator Downloader application, at the time of data download from the LIMS database.
- At this time, data culling can only be specified for top of cores (to remove data from “exotic” material washed down from higher up in the hole). A future version may include culling from core bottoms (“exotic” material “sucked in” when the piston core was removed) and culling from section ends (“edge effect”).
- Some odd behavior has been observed when deleting a cull filter under certain circumstances, and this has not yet been repaired. An easy workaround is to re-load the data.
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