Pitney Bowes MapInfo Vertical Mapper - Manual (Page 166)

Spatial Correlation
164
Vertical Mapper 3.7
Creating a Correlation Matrix
1. From the Vertical Mapper menu, choose the Data Analysis > Spatial Correlation > Correlation
Matrix command.
2. In the Correlation Analysis dialog box, clear any open grids you do not want to include in the
correlation matrix.
3. In the File Name box, type a new file name or accept the default.
4. Click the OK button.
A Browser opens displaying the correlation matrix.
This figure shows part of the correlation matrix for a large number of grids. Note that
the value of a grid compared to itself is always 1.
Grouping
Using grouping, you can identify groups of grids that have correlation coefficients with each other
above a certain value. This is useful for managing large numbers of grids.
1. From the Vertical Mapper menu, choose the Data Analysis > Spatial Correlation > Grouping
command.
2. In the Group Analysis dialog box, clear any grids you do not want to be included in the analysis.
3. In the Group Similarity box, enter the value you want to use to group the grids. All grids with
correlation coefficients above this value will be grouped.
4. In the File Name box, type a new file name or accept the default.
5. Click the OK button.
When the processing is complete, a Browser opens displaying the number of groups found and the
names of the grids in each group. Any grid in a group will correlate with other grids in the group by
the value specified in the group similarity box or higher. Any grid that does not correlate with another
with at least the specified value will be placed in a group called “Non_Grouped.”