Grid To Grid Calculations

  
Contours>Grids>Grid-to-Grid Calculations..

The Grid-To-Grid Calculations tool is a powerful general purpose tool to quickly perform over 30 different grid calculations. This tool is useful for simple mathematical operations, merging two different grids into a single grid, clipping specific grid values, or a variety of other calculations.  The Grid-To-Grid Calculations tool also contains many of the equations used elsewhere, including trend-residual analysis and curvature analysis.

Note: All grids used in this process must have the same number of rows and columns, grid dimensions and extents.

Grid Equation Transform is a slightly simpler tool that can be used for more basic single-grid operations.

Data tab

Output Grid File—C

Sets the name of the newly calculated isopach grid.

 Enter a new name or select an existing grid to overwrite.

Grid Title

Title for the output grid file.

Grid Operation

Drop down list of supported grid operations to perform

  • A and B refer to input grids

  • C refers to the output grid.

Input Grids

Assign the grid files to the "A" and "B" variables in the grid operation.  Use the "Grid Info" buttons to view grid details.

Constant

If the operation calls for a constant value, enter the value here.

List Grids By

Changes how grids are sorted on the input and output menus.

Compare AB

Displays a comparison of grid information between the A and B grids.

Auxiliary File

Establishes a ASCII or CSV file used for time-depth conversions.

Time-Depth tab

The Time-Depth tab only appears when a Time-Depth Conversion operation is selected on the Data tab

Auxiliary File Contains

Sets the general type of time-depth pairs:

  • Depth, Time

  • Time, Depth

Seismic Times Are

  • Grid File - Sets whether the grid uses 1-way or 2-way travel time.

  • Aux File -Sets whether the auxiliary file uses 1-way or 2-way travel time.

Seismic Time Units Are

  • Grid File - Sets whether the grid uses seconds or milliseconds.

  • Aux File -Sets whether the auxiliary file uses uses seconds or milliseconds.

Misc tab

The Misc tab contains one option for setting the zero azimuth. This option is only used for some curvature analysis calculations, and references all calculated azimuths to the selected direction.