Data files

The following data directories include examples and a little information about various file formats I have encountered.

1. 3ds, a data directory of examples of 3ds files, a 3D graphics file format used by 3D Studio;
2. ascii_art_grayscale, a data directory of examples of grayscale ASCII Art files, in which images are created using printable characters.
3. bezier_surface, a data directory of examples of bezier_surface files, a simple format comprising two files, suitable for storing the definition of a Bezier surface used in 3D graphics;
4. bmp, a data directory of examples of BMP files, a Microsoft Bitmap file format for 2D graphics;
5. cdl, a data directory of examples of CDL files, a text version of NETCDF files created by the NCDUMP program;
6. cnf, a data directory of examples of CNF files, the DIMACS CNF file format, used to define examples for the satisfiability problem in conjunctive normal form;
7. csv, a data directory which contains examples of CSV files, a flat file format of Comma Separated Values.
8. dlap, a data directory of examples of DLAP files, a sparse matrix file format used by DLAP;
9. dsp, a data directory of examples of DSP files, a sparse matrix file format, storing just (I,J,A(I,J)), and using one-based indexing.
10. eps, a data directory of examples of EPS files, Encapsulated PostScript file format for 2D graphics;
11. fd1d, a data directory which contains examples of 1D FD files, two text files that can be used to describe many finite difference models;
12. fd2d, a data directory which contains examples of 2D FD files, two text files that can be used to describe many finite difference models;
13. fd3d, a data directory which contains examples of 3D FD files, two text files that can be used to describe many finite difference models;
14. fem1d, a data directory of examples of 1D FEM files, a set of three text files that can be used to describe many finite element models;
15. fem2d, a data directory of examples of 2D FEM files, a set of three text files that can be used to describe many finite element models;
16. fem3d, a data directory of examples of 3D FEM files, a set of three text files that can be used to describe many finite element models;
17. fig, a data directory of examples of FIG files, a 2D graphics file format used by the XFIG program;
18. gif, a data directory of examples of GIF files, a 2D graphics file format;
19. gif_animation, a data directory of examples of GIF ANIMATON files, a 2D animation file format;
20. graph_representation, a data directory of examples of ways of representing abstract mathematical graphs
21. grf, a data directory of examples of GRF files, an abstract graph file format, 2D graphics;
22. hb, a data directory of examples of HB files, the Harwell Boeing sparse matrix file format;
23. hdf, a data directory of examples of HDF files, a general scientific data file format;
24. hdf4, a data directory of examples of HDF version 4.0 files, a general scientific data file format;
25. hdf5, a data directory of examples of version 5.0 HDF files, a general scientific data file format;
26. hex_mesh, a data directory of examples of HEX_MESH files, a mesh of hexagons in 2D.
27. ice, a data directory of examples of ICE files, which store icesheet grid datasets in the NETCDF format.
28. iges, a data directory of examples of IGES files, a neutral file format for 3D graphics data exchange.
29. jpg, a data directory of examples of JPG or JPEG files, a file format for high quality 2D graphics;
30. mat, a data directory which contains examples of MAT files, a data file format used by MATLAB.
31. mesh, a data directory of examples of MESH files, a format for finite element mesh information;
32. met, a data directory of examples of MET files, a graphics file format used by the DISLIN plotting package of Helmut Michels.
33. metis_graph, a data directory of examples of METIS GRAPH files, the format for graphs to be read by METIS, which can partition a graph;
34. metis_mesh, a data directory of examples of METIS MESH files, the format for finite element meshes to be read by METIS, which can partition the elements of such a mesh;
35. mm, a data directory of examples of MM files, the Matrix Market Sparse Matrix File Format;
36. netcdf a data directory which contains examples of netCDF files, a format for the interchange of scientific data.
37. obj, a data directory of examples of OBJ files, a Wavefront file format for 3D graphics;
38. off, a data directory of examples of Object File Format (OFF) files, a Geomview file format for 3D graphics;
39. pbma, a data directory of examples of ASCII PBM files, ASCII Portable Bit Map 2D graphics, black and white;
40. pbmb, a data directory of examples of binary PBM files, binary Portable Bit Map 2D graphics, black and white;
41. pdb, a data directory of examples of PDB files, a file format used by the Protein Database;
42. pdf, a data directory of examples of PDF files, the Portable Document Format, 2D text and graphics;
43. pgh_mri, a data directory of examples of PGH MRI files, a format for storing brain scan data gathered by magnetic resonance imaging;
44. pgma, a data directory of examples of ASCII PGM files, ASCII Portable Gray Map, 2D graphics;
45. pgmb, a data directory of examples of binary PGM files, binary Portable Gray Map, 2D graphics;
46. plc, a data directory of examples of PLC files, used to describe a piecewise linear complex, a surface that bounds a 3D region that is to be meshed.
47. plot3d, a data directory of examples of PLOT3D files, a variety of formats used by the PLOT3D program;
48. ply, a data directory of examples of PLY files, a format for objects defined as a collection of polygons, 3D graphics;
49. png, a data directory of examples of PNG files, Portable Network Graphics, 2D graphics;
50. poly, a data directory of examples of POLY files, a 2D format used by triangle for Planar Straight Line Graphs;
51. poly_3d, a data directory of examples of 3D POLY files, a 3D format used by tetgen for a Piecewise Linear Complex;
52. polygonal_surface, a data directory of examples of POLYGONAL SURFACE files, a simple file format comprising two files, suitable for storing the definition of a surface that is made up of a set of polygons of a fixed order, 3D graphics;
53. pov, a data directory of examples of POV files, Persistence of Vision format, 3D graphics;
54. ppma, a data directory of examples of ASCII PPM files, ASCII Portable Pixel Map, 2D graphics, color;
55. ppmb, a data directory of examples of binary PPM files, binary Portable Pixel Map, 2D graphics, color;
56. ps, a data directory of examples of PS files, PostScript files, 2D graphics;
57. quad_mesh, a data directory of examples of QUAD_MESH files, a quadrilateral mesh in 2D.
58. quad_mesh_order1, a data directory of examples of QUAD_MESH files, a quadrilateral mesh in 2D, with an associated data value that is constant over each element of the mesh;
59. quad_surface, a data directory of examples of QUAD_SURFACE files, a quadrilateral mesh in 3D, used to define a surface.
60. sparse_cc, a data directory of examples of SPARSE CC files, a three-file format for the sparse compressed column matrix format;
61. sparse_cr, a data directory of examples of SPARSE CR files, a three-file format for the sparse compressed row matrix format;
62. sparse_ellpack, a data directory which contains examples of SPARSE ELLPACK files, a two-file format for the storage of a matrix with a known maximum number of nonzeros per row.
63. st, a data directory of examples of ST files, the Sparse Triplet format, a sparse matrix file format, storing just (I,J,A(I,J)), and using zero-based indexing.
64. stla, a data directory of examples of ASCII STL files, ASCII Stereolithography files, 3D graphics;
65. stlb, a data directory of examples of binary STL files, binary Stereolithography files, 3D graphics;
66. svg, a data directory of examples of SVG files, Scalable Vector Graphics, 2D graphics, that can be included in an HTML file;
67. table, a data directory of examples of TABLE files, a simple format for N points in M dimensions;
68. tec, a data directory of examples of TEC files, Tecplot files used for storing 2D or 3D graphics with attributes;
69. tet_mesh_order4, a data directory of examples of TET_MESH_ORDER4 files, description of a linear tet mesh of a set of 3D points, using a pair of files to list the node coordinates and the 4 nodes that make up each tetrahedron;
70. tet_mesh_order10, a data directory of examples of TET_MESH_ORDER_10 files, description of a quadratic tet mesh of a set of 3D points, using a pair of files to list the node coordinates and the 10 nodes that make up each tetrahedron;
71. tet_mesh_tet_neighbors, a data directory of examples of TET_MESH_TET_NEIGHBOR files, description of a format for tetrahedron adjacency information in a tetrahedral mesh of 3D points;
72. tri_surface, a data directory of examples of TRI_SURFACE files, a 3D surface defined by a collection of triangles.
73. tria, a data directory of examples of TRIA files, a homegrown triangulation format, ASCII, 3D graphics;
74. triangle_files, a data directory of examples of files used by the triangle and showme programs.
75. triangulation_order3, a data directory of examples of TRIANGULATION_ORDER3 files, description of a linear triangulation of a set of 2D points, using a pair of files to list the node coordinates and the 3 nodes that make up each triangle;
76. triangulation_order4, a data directory of examples of TRIANGULATION_ORDER4 files, description of a triangulation of a set of 2D points, using a pair of files to list the node coordinates and the 4 nodes that define each triangle (3 vertices and the centroid);
77. triangulation_order6, a data directory of examples of TRIANGULATION_ORDER6 files, a description of a quadratic triangulation of a set of 2D points, using a pair of files to list the node coordinates and the 6 nodes that make up each triangle; Six-node triangles are used when a higher degree approximation is desired; they may also be used as isoparametric elements that model curved boundaries;
78. trib, a data directory of examples of TRIB files, a homegrown triangulation format, binary, 3D graphics;
79. txt, a data directory of examples of TXT files, that is, plain old text files;
80. vla a data directory which contains examples of VLA files, a 3D graphics line format;
81. vtk, a data directory which contains examples of "legacy" (old style) VTK files, a file format used by the Visual Toolkit;
82. vts, a data directory which contains examples of VTS files, a file format used by the Visual Toolkit, which contains information associated with a curvilinear or structured grid, which can be displayed by the paraview program;
83. vtu, a data directory of examples of XML-based VTU files, a file format used by the Visual Toolkit for unstructured grid data;
84. vu, a data directory of examples of VU files, a file format used by the VU program;
85. wav, a data directory of examples of WAV files, a Microsoft format for storing audio data;
86. x3d, a data directory of examples of X3D files, a format for creating 3D graphics within an HTML environment; X3D is the successor to the VRML/WRL file format.
87. xbm, a data directory of examples of XBM files, the X Windows bitmap format, a 2D graphics black and white format for icons;
88. xgl, a data directory of examples of XGL files, a 3D graphics file format;
89. xy, a data directory of examples of XY files, a simple 2D graphics point format;
90. xyf, a data directory of examples of XYF files, a simple 2D graphics point and face format;
91. xyl, a data directory of examples of XYL files, a simple 2D graphics point and line format;
92. xyz, a data directory of examples of XYZ files, a simple 3D graphics point format;
93. xyzf, a data directory of examples of XYZF files, a simple 3D graphics point and face format;
94. xyzl, a data directory of examples of XYZL files, a simple 3D graphics point and line format;

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