Pitney-bowes MapInfo Professional Uživatelský manuál stáhnout pdf (Strana 302)

2. The second method, Combine Objects Using Column, is used to combine objects into groups based

on a specified column.

3. The third method, Redistricting, is covered in Redistricting-Grouping Map Objects into Districts.

Most frequently, the Combine Regions options are your easiest and quickest options for combining

regions and creating territories.

Combining Selected Objects

When you choose to combine objects, MapInfo Professional performs two operations:

• MapInfo Professional geographically combines the selected objects. The new object represents the

geographical union of the original objects and the border between the regions disappears.

• MapInfo Professional performs data aggregation. As described earlier in this chapter, data aggregation

is a process where MapInfo Professional calculates what the column values for the new object should

be, based on sums or averages of the original objects.

Your setup of the Layer Control window depends on whether you want to copy the result object to another

layer (and, thus, save the original objects) or combine the objects in the original layer (and, thus, lose

the original objects).

If you want to copy the result object, make the region's layer Selectable and another layer Editable.

Specify a target object, then select the objects using any selection method and on the Objects menu,

click Combine. This will display the Data Aggregation dialog box where you tell MapInfo Professional

how to combine the data. Fill in this dialog box and click OK to combine the objects to combine the

objects' data. This method was discussed earlier in this chapter.

If you want to combine objects in the original layer, make sure that the layer is editable, select the objects

in the layer, and on the Objects menu, click Combine. Do not set a target. The Data Aggregation dialog

box displays. After the operation is complete, a new object will be added to the layer, and the original

objects will be deleted.

Combining Objects Using Column

Combine Objects Using Column allows you to modify geographic data to create new map objects that

contain data about the group. This feature is similar to redistricting in that it groups objects together, but

goes beyond redistricting to combine a copy of the relevant objects while leaving the original objects

untouched.

To access Combine Objects Using Column:

1. On the Table menu, click Combine Objects Using Column. For example, you have a layer of states.

You want to combine the state boundaries to create sales territories. The data record associated

with each state looks like this:

AVG_SALESCUSTOMERSSTATESALES_REP

24231.41782West VirginiaBenita

33265.0121OhioBenita

• SALES_REP: Sales representative assigned to that state

• CUSTOMERS: Number of customers per state

• AVG_SALES: Average spent per customer

You would like to aggregate the data in the following manner:

• SALES_REP: Combine all records that list Benita as the sales representative

• CUSTOMERS Sum up the number of customers in the sales territory

MapInfo Professional 12.5302

Creating Territories by Combining Objects

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