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About Correlator 4.0

The Correlator application facilitates stratigraphic correlation of cores from multiple holes at a drill site. Its features support

• depth shifting of cores based on high-resolution core logging data, including images, to construct a core composite depth below sea floor (CCSF) depth scale; and
• splicing of selected core intervals to construct the most complete stratigraphic representation possible at a site. 

1.2. The SCORS ecosystem

On the JOIDES Resolution (JR), the Correlator application documented here is used as part of in conjunction with other applications within the stratigraphic correlation support (SCORS) ecosystem . Additional software applications used in conjunction with Correlator (Fig. 1-1), which are covered in a separate user guide (Table 1-21, Fig. 1-21). 1). 

Figure 1-1. Stratigraphic correlation support (SCORS) applications.

Table 1-211. Stratigraphic correlation support (SCORS) applications and application documentation

Version 4.0 beta was released in April 2022. It can be downloaded at

<GitHub link>

On the JR you don't need to download the application - access will be obvious, or assisted by JRSO staff.

Correlator installs a directory for its internal database at a default location that looks something like this:

• Documents [or other system folder] > Correlator > 4.0 > db | default.cfg | log | temp

When you import correlation data from a directory of choice, Correlator indexes the data and places them in this directory for internal use. You don’t have to be aware of this directory but can change the path if needed (Fig. 1-2):
Figure 1-31. Correlator File menu.
 
Affine tables created in Correlator versions 3 and 4 differ from those in version 2: they include additional information (last three columns, see Appendix 2) that allow Correlator to reconstruct the relationship between cores. Affine tables created in the production version, 2.1_rc2 can still be imported in 4.0 by right-clicking "Saved Tables" in the Data Manager (available once data are loaded) and choosing Import legacy affine table. However, because legacy affine tables have no record of the reference core used to create a TIE, all cores shifted by a TIE will be converted to status REL on import into 4.0. This has no effect on their cumulative offsets, which will be preserved, but users will have to rebuild the TIEs manually (as was the case in version 2). 

2. Correlator basic functions overview

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3. Manage data in Correlator

3.0. Overview of data management functions

(Move up from 2.6.)

3.1. Import primary correlation data

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3.2. Import core section summary files

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3.3. Import core section images

Important:

• You must first import some primary correlation data (and the associated section summary data) before you can import images.
• The images must be JPEG format and in the order of ~200 kb each, which is sufficient for most correlation purposes. Try higher resolution at your own risk.

To import images:

• Right-click on Images in the Data Manager window.
• Navigate to your local data directory
• Select the folder containing the JPEG images you want to import and click import.

3.4. Load data for correlation

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3.5. Update Correlator data

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3.6. Export data

Export affine and splice tables

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Export correlation data

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Export spliced data and images

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4. Depth shift cores

4.1. Depth shift concepts

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4.2. Shift cores with the TIE method

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4.3. Shift cores with the SET method

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4.4. Undo shifts

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4.5. Manage affine tables

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4. Construct the splice

4.1. Splice concepts

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