Gridding Method - Overview

Gridding methods are algorithms that are applied to your horizon data to calculate and assign values to a grid. The default gridding parameters in WinPICS generally give you acceptable results, but can be changed to suit your interpretation needs. If possible, test each gridding method to determine which method provides the best representation of your data.

Select the gridding method by clicking on the arrow in the upper right-hand corner of the Gridding dialog box and selecting an option from the drop-down menu. There are six gridding methods in WinPICS:

DGI - Honors input data closely. Uses the SGL (Surface Gridding Library) to produce surfaces from widely varying data input points. Preferred method to use when gridding with fault traces. Produces smooth maps with well defined fault edges.
Inverse Distance Weighting – Honors input data closely if smoothing is set to zero and the power to distance ratio is large. Tends to create isolated closures (‘bulls eye’). Fast gridding method.
Kriging/Collocation – Tends to connect values into ridges instead of isolated closures. Good for sparse or irregularly spaced datasets. Slower gridding method.
Minimum Curvature – Creates smooth maps with flowing contours and minimal edge effects. Excellent for regional mapping, low relief areas, isochrons etc.
Triangulation - Honors input data closely. If faults are well defined on both sides of the fault, it does a good job of honoring fault blocks, but may produce visibly angular results. Slower gridding method. Poor choice for sparse datasets.
Get Trend Only – Used for trend analysis. Calculates and outputs the trend of the seismic data.

All WinPICS gridding methods use some form of distance weighting. This means that input data values nearest to the grid node have the largest effect on the calculated grid node values. The difference between the gridding methods lies in how data points are weighted as a function of distance from the grid node.

Change parameters for each gridding method by clicking <More Options> in the Gridding dialog box.

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