11.4 Grid Cell Geometry

RESQML has three grid cell geometries (Figure 11.4-1):

• Block-centered cells
• Column-layer cells

• Unstructured cells

Figure 11.4-1 The three explicit grid geometries and the two abstract grid geometries, excluding extensions.

If the geometry is explicit, then the RESQML cell geometry is inferred from the cell corner nodes, to which points are attached. The two RESQML examples are the unstructured grid cells, for which cell nodes define the faces of the cells and the column-layer grid cells, for which cell nodes define the coordinate lines of the cells. The column-layer grids may be IJK (structured) or unstructured. The grid descriptions also consist of the topological relationships between cells, nodes, coordinate lines, faces, and/or the other indexable elements of the grid. Additional points, to support higher order geometries, may also be associated with a grid, as described in Section 11.7.1 Higher Order Grid Geometry and Properties .