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Surface graph

The surface graph provides a 3D "topographical" view of data.

The surface graph lets you represent data topographically in three dimensions. The graph uses an X-Z grid drawn at regular increments in the X and Z directions, with one Y value for each X-Z intersection. The color scale of the graph is automatically keyed to the height of points, helping the viewer differentiate between higher and lower values.

• A surface graph represents a minimum of two data sets and usually at least three. Each data set holds the Y values of a row of points along the X axis. The first set applies to the row of points perpendicular to the Z origin (the "back" of the graph), and subsequent sets apply to additional rows.
  
  
• All panels of the surface graph (the rectangles formed by the X and Z grids) are colored according to their height. You specify the colors at the maximum and minimum points of the axis, and Graphics Server interpolates colors between these points.
  
  
• In drawing a surface graph, you can use lines to show the edges of each panel, fill each panel with a solid color, or use both lines and fills. You can also add side walls to the front and right edges of the graph if you choose.
  
  
• In the X and Z directions, Graphics Server automatically places points at increments of 1, starting at 0.
  
  
• You can use both positive and negative Y values in a surface graph.
  
  

Use a surface graph...

• When you want to show data topographically in three dimensions and you can place your points at equal increments along the X and Z axes.
  
  

Other graph types to consider

• If your data points have irregularly spaced Z values, consider a 3D scatter graph.
  
  
• If your data points have irregularly spaced X values but regular Z values, try a tape graph.