Pitney Bowes MapInfo Professional - Manual (Page 280)

To save individual categories in a theme template when creating a new thematic map or for an existing
thematic map, from the Modify Thematic Map dialog box choose Save As and specify a template Name.
Select the Save Individual Value Categories check box and choose OK. A template is saved that can
be used to apply the stored individual categories to a second table. When you choose Map > Create
Thematic Map, the template's name will appear in the Template Name field of the Create Thematic
Map - Step 1 of 3 wizard panel.
Important Notes for Creating and Merging Theme Templates:
When you are creating and merging theme templates:
• MapInfo Professional saves the custom label order only when the option to Save Individual Value
categories is selected in the Save Theme to a Template dialog box. This implies that when you
create a theme based on a template, MapInfo Professional applies the custom label order only when
the thematic expression creates the same categories as those in the template.
• When you are merging theme templates, the custom label order from the source template is applied
to the current theme only when the option to Merge Individual categories is selected in the Merge
a Template to a Theme dialog box and the template and current theme have the same number of
categories.
Updating Columns using Thematic Mapping
As explained earlier in this chapter, you can use data from another table to construct your thematic map
using Update Column. Update Column creates a temporary column in your base table and automatically
inserts data into it for your map. This data can be a field taken directly from another table, or aggregated
from other data.
For example, you have a table of U.S. state boundaries and a table of U.S. city point locations. Using
ranges of values you want to shade the STATES table according to the percentage of each state's
population living in urban areas. For MapInfo Professional to calculate this percentage, the population
for the cities must be in the STATES table.
Some of the files used in this example may be from the MapInfo Professional Tutorial data and
is only available from the Pitney Bowes Software Inc. web site,
http://go.pbinsight.com/webtutorials .
Note:
To create a temporary column using Update Column:
1. Open the base table (USA.TAB) and the city table (USCTY153.TAB).
2. On the Map menu, choose Create Thematic Map.
The Create Thematic Map - Step 1 of 3 wizard panel opens.
MapInfo Professional 12.5 280
Updating Columns using Thematic Mapping