Network (Graph) File Formats
This is an example of a graph stored in a netcdf file. Source http://anusf.anu.edu.au/Vizlab/drishti/DrishtiHelp.pdf Data would be stored on edges or, coords or vertices. I'm not sure if I like it yet... It's a bit hard to search for because graph often means chart.
netcdf pt80 { dimensions: nvertices = 11 ; coords = 3 ; nedges = 3 ; connections = 2 ; variables: float vertex_centers(nvertices, coords) ; float vertex_radius(nvertices) ; float vertex_volume(nvertices) ; int edge_neighbours(nedges, connections) ; float edge_radius(nedges) ; float edge_net_length(nedges) ; // global attributes: :gridsize = 80, 80, 80 ; data: vertex_centers = 4.829041, 76.55481, 16.07257, 7.333344, 78.66669, 53.83331, 11.83334, 64.66669, 23.66669, 12.66666, 67.66663, 19, 13.5, 68.5, 27, 14.5, 79, 1, 23.76926, 78.15387, 0.2307739, 26.7973, 48.77142, 46.80756, 38, 44, 42, 39.40677, 66.16608, 61.58075, 51.37497, 60.37494, 43.25 ; vertex_radius = 4.472136, 2.236068, 2.44949, 2.236068, 2.44949, 1.732051, 1.414214, 9.899495, 4.898979, 4.690415, 1.414214 ; vertex_volume = 619.9999, 6, 6, 3, 2, 2, 13, 21150, 1, 3788, 8 ; edge_neighbours = 1, 3, 7, 9, 8, 10 ; edge_radius = 0, 3.605551, 0 ; edge_net_length = 4.368e-005, 4.368e-005, 4.368e-005 ; }