GOCAD voxel

3D data format encoded as text, documented at http://paulbourke.net/dataformats/gocad/gocad.pdf and https://scholar.harvard.edu/files/plesch/files/gocadinahurry.pdf.
This category is also used for GRID3D and Voxet.

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Crustal Architecture Beneath the Southern Midcontinent (USA) -- Data Grids and 3D Geophysical Models

Regional grid files and 3D voxel models were used to study crustal architecture. Includes grid files consist of surface grids used in the inversions, and calculated geophysical data grids produced by the inversions. Data are provided in GOCAD voxel and GXF grid formats.