2. Sampling Methods - BjornNyberg/NetworkGT GitHub Wiki
Figure 1 - Examples of different sampling techniques that can be used within NetworkGT: A-Polygon Subsamples; B-Bounding Box Polygon; C-Line Samples/Line Grid; D-Contour Grid.
Line Grid
A line grid sampling method will define a one dimensional line sampling (Fig. 1C) at a user-specified distance and rotation within the interpretation boundary or extent of a specified frature network. The input sampling can be useful to define spatial distributions of frature sets and displacement along a fracture network using the Line Frequency tool. It is important to sample the fracture network perpendicular to the fracture set to minimize bias.
Contour Grid
The contour grid sampling method defines a regular space of rectangular polygons within the interpretation boundary or extent of a specified fracture network (Fig. 1D). This subsampling allows for a quantitative analysis of topological, geometrical and fluid flow variation throughout a fracture network. The user can specifiy the width, height and rotation of the contour grid. To address the granularity of the subsampling spacing, it is also possible to specify a radius parameter that will define the centroid point within each gridded subsample area and extract the parameters. The search radius will only extend to the interpretation boundary to ensure minimial edge effects on geometrical, topolopgical or fluid flow parameters. For 2D fluid flow simulations, it is a requirement to use a contour grid sampling method.