Surfer 13, scientific graphics software accurately transforms XYZ data into presentation-ready maps. The gridding and contour mapping software, used by geologists, hydrologists and engineers, offers 13 different gridding methods, including Kriging with variograms, to convert irregularly spaced XYZ data into a uniform grid. Users can display a grid or digital elevation model in one of nine fully customizable 2-D and 3-D grid-based map types: contour, watershed, viewshed, image, shaded relief, 1-grid and 2-grid vector, 3D wireframe and 3D surface maps. The display can be enhanced by adding post and base maps. Features include the ability to display latitude/longitude graticule lines over a projected map, allowing users to view maps and data in various coordinate units. Users can also create an additional grid in different units, allowing projection of a map in one set of units (e.g. meters) and display a grid in different units, such as feet.