MapInfo Products KnowledgeBase

Product: MapInfo Professional
Version: 8.0, 7.8, 7.5 b21, 7.0 b22, 6.5 b19, 6.0, 5.5, 5.0
Platform: All Windows Platforms
Category: Thematic Mapping

Summary:
Creating a bivariate thematic map.

Question:
Creating a bivariate thematic map.

Answer:
A bivariate thematic map uses point or line objects to represent two variables. For instance, a colored circle could represent a particular company while the size of the circle would represent the number of orders for that company. There are, however, limitations to this type of thematic mapping:

1. At least one of the maps must be based on a numeric variable.
2. There is a limit to using 2 ranged or 1 ranged and 1 individual variables.

In the following example, the Central_Offices table will be shaded by company name and a ranged variable that represents the total population within a 5 mile radius of each Central Office point.

A. Create the Individual thematic map for company names:
1. Choose Map>Create Thematic Map.
2. In the Create Thematic Map – Step 1 of 3 dialog, choose Type as Individual and Template name should be Point IndValue Default. Click Next.
3. In the Create Thematic Map – Step 2 of 3 dialog, from the Table drop down, choose the Central_Offices point table and from the Field drop down choose Company. Click Next.
4. In the Create Thematic Map – Step 3 of 3 dialog, click OK. The resulting Thematic map shades the Central Office points according to company.

B. Create the ranged thematic map based on population:
1. Choose Map>Create Thematic Map.
2. In the Create Thematic Map – Step 1 of 3 dialog, choose Type as Ranges and Template name should be Point Ranges, Varying Sizes. Click Next .
3. In the Create Thematic Map – Step 2 of 3 dialog, from the Table drop down choose the Central_Offices point table and from the Field drop down choose total_Pop_5Mile_Radius. Click Next.
4. In the Create Thematic Map – Step 3 of 3 dialog, choose Styles.
5. In the Customize Range Styles dialog, choose Options.
6. In the Apply groups, choose Size:



7. Click OK. Then, click Next and click OK in the Create Thematic Map – Step 3 of 3 dialog. The resulting bivariate thematic map displays the company by color and the order amount by the size of the circle:



Last Modified: 07/13/2005 10:17:18 AM
Document URL: http://testdrive.mapinfo.com/techsupp/miprod.nsf/kbase_by_product/905B58AA3ED09B80852568D500647EAC

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