Calculating the default Grid Spacing or # of Nodes in the Grid Data dialog in Surfer
The default grid resolution defined in the Grid Line Geometry section, in the Output page of the Grid Data dialog.

These fields are calculated as follows:
- 100 grid nodes are assigned to the longest direction.
- The grid spacing is calculated for that direction:
(Maximum-Minimum) / (# of Nodes – 1) - The same grid spacing is applied to the shorter direction.
- The # of Nodes for the shorter direction is calculated:
((Maximum-Minimum) / Spacing) + 1 - If the # of Nodes in the shorter direction is not greater than 4, then the minimum and maximum values in that direction will be adjusted so that there are at least 4 grid nodes. This means that for data sets where one direction has a vastly different range than the other direction, the grid extents may not exactly match the data extents.
Updated October 2021
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