Data files


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

  1. ascii_art_grayscale, a data directory of examples of grayscale ASCII Art files, in which images are created using printable characters.
  2. 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;
  3. cc, a data directory of examples of sparse matrices stored as Compressed Column (CC) files, a three-file format;
  4. cdl, a data directory of examples of CDL files, a text version of NETCDF files created by the NCDUMP program;
  5. 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;
  6. csv, a data directory which contains examples of CSV files, a flat file format of Comma Separated Values.
  7. dlap, a data directory of examples of DLAP files, a sparse matrix file format used by DLAP;
  8. dolfin_xml a data directory which contains examples of XML files that describe 3D finite element meshes as used by DOLFIN and FENICS.
  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. gif, a data directory of examples of GIF files, a 2D graphics file format;
  18. gpl, a data directory of examples of GPL files, a graphics file format used by GNUPLOT;
  19. graph_representation, a data directory of examples of ways of representing abstract mathematical graphs
  20. grf, a data directory of examples of GRF files, an abstract graph file format, 2D graphics;
  21. hb, a data directory of examples of HB files, the Harwell Boeing sparse matrix file format;
  22. hdf, a data directory of examples of HDF files, a general scientific data file format;
  23. jpg, a data directory of examples of JPG or JPEG files, a file format for high quality 2D graphics;
  24. medit, a data directory which contains examples of files which can be used by the MEDIT program to define a 2D or 3D mesh for use by the finite element method (FEM), using triangles, quadrilaterals, tetrahedrons or hexahedrons.
  25. met, a data directory of examples of MET files, a graphics file format used by the DISLIN plotting package of Helmut Michels.
  26. 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;
  27. 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;
  28. mm, a data directory of examples of MM files, the Matrix Market Sparse Matrix File Format;
  29. msh, a data directory of examples of MSH files, the native 3D mesh format used by gmsh.
  30. netcdf a data directory which contains examples of netCDF files, a format for the interchange of scientific data.
  31. obj, a data directory of examples of OBJ files, a Wavefront file format for 3D graphics;
  32. off, a data directory of examples of OFF files, a file format for 3D graphics;
  33. pbma, a data directory of examples of ASCII PBM files, ASCII Portable Bit Map 2D graphics, black and white;
  34. pbmb, a data directory of examples of binary PBM files, binary Portable Bit Map 2D graphics, black and white;
  35. pdb, a data directory of examples of PDB files, a file format used by the Protein Database;
  36. pdf, a data directory of examples of PDF files, the Portable Document Format, 2D text and graphics;
  37. pgh_mri, a data directory of examples of PGH MRI files, a format for storing brain scan data gathered by magnetic resonance imaging;
  38. pgma, a data directory of examples of ASCII PGM files, ASCII Portable Gray Map, 2D graphics;
  39. pgmb, a data directory of examples of binary PGM files, binary Portable Gray Map, 2D graphics;
  40. 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.
  41. plot3d, a data directory of examples of PLOT3D files, a variety of formats used by the PLOT3D program;
  42. ply, a data directory of examples of PLY files, a format for objects defined as a collection of polygons, 3D graphics;
  43. png, a data directory of examples of PNG files, Portable Network Graphics, 2D graphics;
  44. poly, a data directory of examples of POLY files, a 2D format used by triangle for Planar Straight Line Graphs;
  45. poly_3d, a data directory of examples of 3D POLY files, a 3D format used by tetgen for a Piecewise Linear Complex;
  46. 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;
  47. pov, a data directory of examples of POV files, Persistence of Vision format, 3D graphics;
  48. ppma, a data directory of examples of ASCII PPM files, ASCII Portable Pixel Map, 2D graphics, color;
  49. ppmb, a data directory of examples of binary PPM files, binary Portable Pixel Map, 2D graphics, color;
  50. ps, a data directory of examples of PS files, PostScript files, 2D graphics;
  51. quad_mesh, a data directory of examples of QUAD_MESH files, a quadrilateral mesh in 2D.
  52. 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;
  53. quad_surface, a data directory of examples of QUAD_SURFACE files, a quadrilateral mesh in 3D, used to define a surface.
  54. sparse_cr, a data directory of examples of sparse matrices stored as Compressed Row (CR) files, a three-file format;
  55. st, a data directory of examples of Sparse Triplet (ST) files, a sparse matrix file format, storing just (I,J,A(I,J)), and using zero-based indexing.
  56. stla, a data directory of examples of ASCII STL files, ASCII Stereolithography files, 3D graphics;
  57. stlb, a data directory of examples of binary STL files, binary Stereolithography files, 3D graphics;
  58. svg, a data directory of examples of SVG files, Scalable Vector Graphics, 2D graphics, that can be included in an HTML file;
  59. tec, a data directory of examples of TEC files, Tecplot files used for storing 2D or 3D graphics with attributes;
  60. 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;
  61. tri_surface, a data directory of examples of TRI_SURFACE files, a 3D surface defined by a collection of triangles.
  62. triangle_files, a data directory of examples of files used by the triangle and showme programs.
  63. 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;
  64. 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);
  65. 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;
  66. vtk, a data directory which contains examples of "legacy" (old style) VTK files, a file format used by the Visual Toolkit;
  67. 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;
  68. vtu, a data directory of examples of XML-based VTU files, a file format used by the Visual Toolkit for unstructured grid data;
  69. vu, a data directory of examples of VU files, a file format used by the VU program;
  70. xml, a data directory of examples of XML files, a standard general datafile format.

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Last revised on 22 September 2014.