Import Locations

Geoscience > Main Launcher > Seismic Menu > Import Locations

Import Locations

The Import Locations dialog allows the user to import positional data into SeisWare. Data can be imported into SeisWare as raw SEG-P data, or imported into existing SEG-Y files to correct missing positional information.

General Information

Input Files

Use this area to specify files for import.

Files...: Open a file browser to select files.

Remove All: Remove all files from the list of files.

Remove: Remove selected files from the list of files.

Type of Input Files

This area allows you to select the type of input file you have.

SEG-P: Input files are standard SEG-P files.

2D UKOOA: Input files are standard 2D UKOOA P1/90 format files.

Header Lines: This allows you to specify how many header lines are in the SEG-P or UKOOA file. It is not used for Columnar ASCII files. The SEG-P standard says there should be 20 header lines in a SEG-P file, but many SEG-P files don't conform, so you may need to override this value. UKOOA files in particular frequently have only 3 header lines, which could result in truncated data if not set correctly.

2D Columnar ASCII: Input files are columnar ASCII files. You define the columns by clicking on the Define Columns... button and selecting the columns to define. For more help with this step refer to the defining columns help file.

3D Columnar ASCII: Input files are columnar ASCII files representing data for 3D surveys. Only three corners of a survey need to be defined in order to import the survey information.

Define Columns: Define the columns when importing ASCII files.

Import Into

This area allows you to select how you want to import the files.

Database only: Selecting this option imports the raw SEG-P files into SeisWare. The lines are displayed on the map and can have horizons added to them. Note: You can only perform 3D survey imports using the "Database only" option of the Import Into section.

Overwrite existing lines: This option is only available when importing SEG-P into the database only. If checked any new SEG-P information will overwrite an existing SEG-P line. If unchecked, existing lines are retained. Existing SEG-Y files are never overwritten with SEG-P lines when just importing into the database.

SEG-Y files: This option imports the positional information into existing SEG-Y files. Use this when the SEG-Y files do not already have positional information defined in the headers.

When Matching SEG-Y Trace: This area allows you to specify how to import the positional information. It is only available when importing Columnar ASCII files.

Match shotpoint: This option determines which trace to assign positional information to by shotpoint number. Shot must be defined as one of the columns.

Match CDP: This option determines which trace to assign positional information to by CDP number. CDP must be defined as one of the columns. This option is most useful when importing Chevron style lines which have duplicate shotpoints.

Restrict to Seismic Lines

Select the seismic lines that you want the location information imported to. If no lines are selected then the application will attempt to import the all of the locations within the import file into the project. This option is only available when importing data into SEG-Y files.

Left click to select a seismic line, left click and press the Ctrl key on your keyboard to select multiple seismic lines, or select a group of lines from the Basemap. To help you make your seismic line selections, you can sort any of the columns, you can apply a filter (), or you can type a search string into the search bar to limit the list.

For additional selection and navigation options right click on the seismic fileslist to access the shortcut menu.

Coordinate Parameters

This area allows you to specify information about the coordinates contained within the file.

Input Coordinates: This option allows you to import positional data from either the northing/easting columns of the SEG-P file or the Latitude and Longitude columns of the SEG-P file. When importing latitude/longitude data it is converted to positional data using either the project's coordinate system, or the source and destination coordinate systems supplied in the dialog.

Northing/Easting Scalar:
Applies a scalar to the northing/easting values to convert them to the units of the destination coordinate system. Typically SEG-P UTM values are in decimeters, so the default scalar of 0.1 converts them to Meters. For columnar data you will often set this value to 1.

Shot Scalar: Applies a scalar to shotpoint values. Often shotpoints found in files have been multiplied by 10. Set to 0.1 to return the shotpoint to it's original value.

Source Coordinate System:This is the coordinate system of the input SEG-P files. Select a coordinate system by clicking on the "..." button. By default this is set to the coordinate system in the Project Propertiesdialog. If you have obtained SEG-P files with a different coordinate system from that of your project (such as a neighboring UTM zone) you can set this value to automatically convert the files to the project's coordinate system. If you do not have a coordinate system defined for the project this area will initially be blank. If you are importing northing/easting values the coordinate system does not need to be set.

Destination Coordinate System: This is the destination coordinate system for the project. Select a coordinate system by clicking on the "..." button. By default this is set to the coordinate system in the Project Properties dialog. It is best to set this in the project properties rather than in this dialog. If you do not have a coordinate system defined for the project this area will initially be blank. If you are importing northing/easting values the coordinate system does not need to be set, however you need a destination coordinate system when importing latitude/longitude data. When converting between coordinate systems you need to set both the source and destination coordinate systems.

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