POSC Specifications
Version 3.0
Epicentre Standard Values
ref_grid_variant

ref_grid_variant

Standard Instance Values

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

Go To Top


© Copyright 2001 POSC. All rights reserved.