Pitney Bowes MapInfo Professional - Manual (Page 275)

4. Select the Ignore Zeroes or Blanks check box to ignore zero values and blank values in the table.
Because you are creating a thematic map based on one field in a table, any zero or blank values in
that field will cause the whole record to be ignored. If you are creating a grid map, you can choose
a table of regions to clip the grid against.
5. Click Next to go on to Step 3 - Customizing Your Thematic Map.
Multi-Variable Thematic Maps
Pie and Bar Chart thematic maps allow you to analyze more than one variable at a time. In the Create
Thematic Map - Step 2 of 3 wizard panel, you choose the fields or expressions you want to use as the
variables, and list them in an order that best suits your analysis.
To create a multi-variable thematic map in the Create Thematic Map - Step 2 of 3 wizard panel:
1. Choose the table on which you want to base the map from the Table drop-down list.
The drop-down list displays the tables that are mapped in the active Map window.
If you have objects selected in the Map window, the Selection from TABLE item also displays in the
list. This enables you to create a thematic map based on the selected items without having to map
the selection.
Fields from TABLE displays all the numeric fields in the table you selected from the Table list.
2. Choose the field, or create an expression that contains the data values.
Fields for Pie/Bar Chart indicates the fields or expressions you have chosen for your pie or bar
chart thematic map. The order of the variables in the Field for the Pie/Bar Chart list is the order in
which the variables appear in the legend.
• For bar chart thematic maps, the order in which the variables display in the legend is the order in
which the bars display from left to right on the map.
• For pie chart maps, the first variable in the legend corresponds to the pie wedge that begins at the
angle specified in the Customize Pie Style dialog box.
3. Click Styles in the Create Thematic Map - Step 3 of 3 wizard panel.
The Customize Pie Style dialog box opens:
• Click Up to move the selected field or expression up one place in the Fields for Pie/Bar Chart
list. Up is unavailable when the selected item is the first item in the list.
• Click Down to move the selected field or expression down one place in the Fields for Pie/Bar
Chart list. Down is unavailable when the selected item is the last item in the list.
• Click the Right Arrow button to move the selected field in the Fields from TABLE list to the Fields
for Pie/Bar Chart list.
• Click the Left Arrow button to move the selected field in the Fields for Pie/Bar Chart list to the
Fields from TABLE list.
4. Click Next to go on to Step 3.
Step 3 - Customizing Your Thematic Map
The last step allows you to customize your thematic map, or create the map based on the default settings.
You can also preview the map's legend before you display the map, and change the legend's label order.
Use these features:
• Preview (Thematic Map) - Displays a sample legend of the thematic map you are creating.
• Customize - The buttons in the Customize group enable you to change the default settings of particular
aspects of your thematic map. For more information, see the Help topic, Modifying A Thematic Map.
• Ranges - Allows you to customize settings on a ranged map. This option is available for ranged and
grid maps.
275 MapInfo Professional User Guide
Chapter 10: Creating Thematic and Other Themed Maps