If a set of observations all have the same (x, y) values,
the mean Z value of the set is used as the Z
value at point (x, y) for the purpose of fitting the surface.
- Grid Size:Horizontal Size
- specifies the horizontal resolution of the rectangular grid over which surface
and ZColor functions are evaluated.
- Grid Size:Vertical Size
- specifies the vertical resolution of the rectangular grid over which surface
and ZColor functions are evaluated.
- Fit:Linear Interpolation
- linearly interpolates surface and ZColor functions across rectangular grid cells.
- Fit:Thin-Plate Smoothing Spline
- fits surface and ZColor functions over the
rectangular grid using thin-plate smoothing spline fitting. The
process may be much slower than linear interpolation. It usually
produces very smooth surfaces and colors.
- Number of Contour Levels
- specifies the number of contour levels to be drawn over the
surface. The contour levels are spaced evenly within the range of
the ZColor variable or the Z variable if there is no
ZColor variable specified.
Copyright © 1999 by SAS Insitute Inc., Cary, NC, USA. All rights reserved.
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