Cropping and converting 2D grids

You can also convert a 2D grid directly from its context menu. This creates a surface using the default settings in the Crop tool. Use the tool itself when you need greater control over the conversion.

You can convert a 2D grid into a polyline set, tri-mesh, or new 2D grid using the Crop tool. You can choose to convert all or only part of the grid. If your intention is to remove certain nodes or groups of nodes, other removal tools are also available that handle the removal of nodes in a variety of ways.

To do this:

  1. Open the tool (prepare > Post-Processing Tools > Removal > Crop) in the 2D Grid Tools section of the strip).
  2. From the Model drop-down list, select the source that contains the 2D grid you want to use as the input. All the 2D grids in the selected source become available in the 2D grid drop-down list. Select the 2D grid from this.
  3. On the Grid dimensions tab, you can select which part of the 2D grid is to be converted. Min I, J and Max I, J are the first and last indices in the northern and eastern directions of the new surface, while Step north/east is the step to be used in the conversion. With a step size of 1, all nodes within the range will be exported, and with a step size of 2 every other node will be exported. Check the Confine to area checkbox and select an area from the Active area drop-down list to specify the part of the surface to be exported. Only nodes which are inside this area and the nodes which are the direct neighbors of the nodes inside will be exported.
  4. On the Settings tab, specify the type of object you want to create and the lateral dimensions. Select Tri-mesh to create a tri-mesh out of the 2D grid by creating triangles between its nodes, 2D grid to create a new 2D grid from the original (use this to create a sub-section of the original grid), or Polyline set for a polyline set by connecting neighboring nodes of the 2D grid in two directions.
  5. When creating a polyline set, you can specify in which direction the polylines are created. By default, the polylines will be created in both directions. Selecting I, J or Both I and J means polylines will be created in the I or J direction of the 2D grid, or in both the I and J directions. Selecting Sparse arbitrary and seed line interpretation means that arbitrary lines in the 2D grid will be converted into polylines. This helps to isolate and preserve arbitrary line interpretation in seismic seed horizons.
  6. Click Apply or OK to create the new surface.