Options dialog box (Prolog 4 settings tab)

Use this tab of the Options dialog box to change settings relating to the opening and saving of borehole files in Prolog 4.0 and Prolog 4.1 format. This tab on its own may also be shown when opening a specific Prolog 4.x file.

Settings available are:

Deduce a schema from Prolog file: if ticked the schema for the file is determined from the contents of the Prolog file. MEGS_Log creates a schema with the correct number of fields, sets the type of each field that can be deduced and sets the type for the rest of the fields to "string".
Use a MEGS_Log schema: if ticked the nominated schema is used to open the file. See About Schemas for more information on how schemas affect the reading of Prolog 4 files. The number of fields in the schema must match the number of fields in the Prolog file.
Data log: Loads the specified data log from the file. Some Prolog 4.x files can contain more than one data log, however you can only edit one at a time within MEGS_Log. This setting is only available when opening a specific Prolog file and not in the Options dialog box.

When this tab is being shown as part of opening a specific Prolog file the dialog may also contain a message with more information about the number of fields in the borehole and the number of fields in the currently selected schema. You can use the information in this message to help you choose the best settings to open or save the file.

About deducing Prolog 4 schemas

Schemas are deduced using the following protocol:

The first field is used as the rock type.
The second field is used as the percentage.
The third field is used as the seam name.
The last field is used as the depth.
The second last field is used as the thickness.
The third last field is used as the recovery.
A field named "ply", "ply name" or "seam-ply" is used as the ply field.
A field name "sample", "sample number" or "sample id" is used as the sample number field.
Other fields are given the string type.