POSC Specifications Version 3.0 |
Epicentre Standard Values ref_grid_variant |
identifier | description | source | version | status |
---|---|---|---|---|
ref _version .identifier | ||||
one-half | The variant grid contains every other node in the primary grid. This applies to a seismic line or a general 1d grid. | POSC | epicentre 2.1 | current |
one-third | The variant grid contains every third node in the primary grid. This applies to a seismic line or a general 1d grid. | POSC | epicentre 2.1 | current |
one-fourth | The variant grid contains every fourth node in the primary grid. This applies to a seismic line or a general 1d grid. | POSC | epicentre 2.1 | current |
double | The variant grid has one node between each node in the primary grid, in addition to the nodes in the primary grid. This applies to a seismic line or a general 1d grid. | POSC | epicentre 2.1 | current |
triple | The variant grid has two nodes between each node in the primary grid, in addition to the nodes in the primary grid. This applies to a seismic line or a general 1d grid. | POSC | epicentre 2.1 | current |
quadruple | The variant grid has three nodes between each node in the primary grid, in addition to the nodes in the primary grid. This applies to a seismic line or a general 1d grid. | POSC | epicentre 2.1 | current |
line double | For a 2d grid (e.g. 3d seismic survey), an additional line is inserted between each existing line of the primary grid. The points remain the same. | POSC | epicentre 2.1 | current |
point double | For a 2d grid (e.g. 3d seismic survey), an additional point is inserted between each existing point of the primary grid. The lines remain the same. | POSC | epicentre 2.1 | current |
line point double | For a 2d grid (e.g. 3d seismic survey), the variant grid contains an additional line inserted between each existing line, and an additional point inserted between the points of the new and existing lines. Equivalent to creating a line double, then a point double. | POSC | epicentre 2.1 | current |
line one-half | For a 2d grid (e.g. 3d seismic survey), the variant grid contains every other line in the primary grid. | POSC | epicentre 2.1 | current |
point one-half | For a 2d grid (e.g. 3d seismic survey), the variant grid contains every other point in the primary grid. | POSC | epicentre 2.1 | current |
line point one-half | For a 2d grid (e.g. 3d seismic survey), the variant grid contains every other line in the primary grid, and every other point within the retained lines. | POSC | epicentre 2.1 | current |
corners only | A grid which contains only two endpoints (for a line) or four corners (for a 2D grid). This variant is used to place the binset (in general a grid) on the earth, by giving a minimal number of points and their locations. | POSC | epicentre 2.1 | current |
skeletal | A grid, valid for a line, which is a fraction of the original grid. It is intended to give a (usually regularly) sampled set of bin nodes so that locations need not be given for every point. | POSC | epicentre 2.1 | current |