Pitney Bowes MapInfo Vertical Mapper - Manual (Page 147)

Chapter 8: Using the Grid Tools
User Guide
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• The Method section enables you to choose which method to use to create the range. There are
two options:
Interval in the Value box, type the range of values that each class will encompass. The default
setting is based on dividing the range between the minimum and maximum values into 10
classes
Number in the Value box, type the number of classes that will be created based upon the
Minimum, Maximum and Interval settings. The default is 10 classes.
The Load and Save buttons enable you to load existing settings and to save the current settings so
that they can be used in subsequent grid reclassifications. The save process creates an ASCII text
file with a .pfr extension containing the range, the value, and the colour of each class.
The Ranges table displays the range of values being classified, class name/new value, and the
class colour. Class ranges are created with equal spread and include the lower value and up to but
not including the higher value. You can specify the new class name/value by editing the adjacent
class name cell.
Reclassing Classified Grids
You can reclass the values contained in a classified grid to make the data more suitable for your
analysis. When you reclass a grid, you generate a new grid. You can save a reclass profile for reuse
with other grids using the Save button. You can reclass a classified grid into either a numeric grid or
a classified grid.
1. In the Grid Manager, highlight the grid you want to reclassify.
2. Click the Tools button and choose the Reclass command. The Reclass command gives you
two options, you can either choose to Numeric (.grd) or to Classified (.grc)
3. If you select to Classified (*.grc), the Classified Grid Reclassification Tool dialog opens.
In this dialog box, do any of the following:
•
To assign a class, select it in the Original Classes window and drag it to the New Classes
window. Groups cannot be moved over.
• To add a new class or group, click the Add button.
• To remove the selected class, click the Delete button.
• To move an existing class out of a group, drag the class to the top of the New Class list and
drop it on top of the file name.
• To check that no classes are unassigned, click the Verify button.
• To remove unassigned classes from the New Classes list, click the Reduce button.