GMS:GSF File Format

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A Grid Specification File (*.gsf) is used with MODFLOW-USG to define the unstructured grid geometry. The grid specification file for a structured grid is far less complex than for an unstructured grid. The lack of structure precludes omission of the coordinates of the vertices of each model cell. Hence the locations of these vertices must be specified in the grid specification file, together with the node that is associated with a model cell.

The format is defined in the image [1] below:

Gsf format.png


  1. ^ Doherty, J. (November 2015). Groundwater Data Utilities, Watermark Numerical Computing, 2(9): 26–37.