Pitney Bowes MapInfo Vertical Mapper - Manual (Page 145)

Chapter 8: Using the Grid Tools
User Guide
143
Using the Classified Grid Filter
Using the Classified Grid Filter, you can reclass small isolated areas of cells. This has the effect of
smoothing the grid. The classes are processed individually, beginning with the class containing the
smallest number of grid cells.
1. In the Grid Manager, click the Tools button and choose the Classified Grid Filter command.
2. In the Classified Grid Filter dialog box, from the Grid list, choose the grid to be filtered.
3. In the Number of Stranded Cells box, type the number of cells that denotes an area to be
reclassified.
4. Disable the Use Largest Neighbour check box and type the ratio of the number of cells in the
adjacent class to the perimeter of the area to be reclassified in the Neighbour Uniformity
Threshold box.
5. In the File name box, type a new file name or choose the default.
6. Click the OK button.
Displaying Grid Legends
The Grid Legends tool enables you to display the legend of a selected grid and quickly access the
colour tool so that you can modify grid colours.
1. In the Grid Manager, click the Tools button and choose the Grid Legends command.
2. In the Grid Legends window, from the list at the bottom of the window, choose the grid for which
you want to display a legend.
3. Click the ellipsis (...) button to the right of the list to modify the legend.
For numeric grids, you modify the legend using the Grid Colour Tool, and for classified grids, you
modify legends using the Dictionary Editor.
Reclassing Numeric Grids
You can reclass the values contained in a grid in order to make the data more suitable for analysis.
When you reclass a grid, you generate a new grid. You can save reclass profiles for reuse with other
grids using the Save button.
1. In the Grid Manager, click the Tools button and choose the Reclass command.
2. In the Reclass dialog box, choose the grid you want to reclass from the Grid list..
3. Choose the format of the output grid by clicking the Numeric or the Classified button in the top
right corner of the dialog box.