Pitney Bowes MapInfo Vertical Mapper - Manual (Page 78)

Creating Point Density Grids
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Vertical Mapper 3.7
Exploring the Kernel Smoothing Dialog Box
The Kernel Smoothing dialog box enables you to specify parameters specific to the Kernel
Smoothing algorithm.
The Cell Size box enables you to specify the cell size in the coordinate unit of the point file to be
processed.
The Solution Method section contains the following options:
• The In-Radius Search option enables you to define the search radius and the minimum number
of points within the search radius. If the number of points found is less than the minimum value,
a null value is returned. The size of the search radius depends on the type of data you are
analyzing.
• The Closest Points option enables you to define the number of closest points to include in the
calculation. This option is useful if the quality of your data is in doubt.
The Kernel list enables you to apply one of six kernel estimates to the point file: Unit, Gaussian,
Triangular, Epanechnikov, Bi-Weight, and Tri-Weight. The difference between them is the degree of
weighting points have with respect to their distance to the grid.