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Create by Attribute

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You can also create a selection set using an attribute condition. For example, you could select only those features that had sales figures (stored as feature attributes) in a specific range.

Create a selection set using an attribute condition by pressing the Select by Condition button (funnel with fx) on the Selection toolbar:

The Selection toolbar

The Selection toolbar

This will display the Select by Condition dialog box:

The Select by Condition dialog box

The Select by Condition dialog box

This is the standard Maptitude dialog box used to create conditional statements. Here we have created a simple “does the name field contain the word ‘gallery‘?” condition.

Here are the results using the standard Landmark layer from the US country pack (the selection set has been highlighted with large green circle-cross symbols):

Landmark layer with a selection set using an attribute condition (“Does Name contain the word ‘gallery’?). The selection set is highlighted with green symbols. Note: Not all landmark labels are displayed.

Conditions can get quite complex and the above Select by Condition dialog box allows you to save a condition to a file and then load it later.

Select from a List

Another form of attribute condition is to create a set based on a list of attribute values. Do this by selecting Selection->Select by List on the main menu to display the Select by List dialog box:

The Select by List dialog box

The Select by List dialog box

Select the field (City in this example) and the maximum number of selection sets to create. Maptitude will then create a selection set for each value of this field. Note that the maximum number of selection sets is 512. Set the Create Other set checkbox if you want Maptitude to create an ‘other’ set for all other values of this data field.

Select by Theme

A similar concept is to create a selection set from a theme. This requires a theme that has multiple classes, and Maptitude will create a selection set for each class. For example if you have a layer of customers with a theme that colors them according to the type of maintenance contract, you can then create a selection sets for each type of maintenance contract.

To do this, select Selection->Select by Theme on the main menu to display the Select by Theme dialog box:

The Select by Theme dialog box

The Select by Theme dialog box

Select the theme that you wish to use from the drop down box. Maptitude will tell you the number of classes in parenthesis. This example has a theme that is based on sales quantity, and has been divided into 9 classes. It will create 9 selection sets, one for each class (range) of sales quantity. Press OK and Maptitude will ask for simple confirmation, and then create the selection sets.

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