How to create a domain Group

A group domain is used:

A domain Group lists the upper value boundaries of the groups and the output group names. For ILWIS 1.4 users: a group domain acts as a classify table.

Tip:

To interactively slice an image or to interactively classify a map, you can create a new representation value or gradual. For more information, see How to slice an image and How to classify a map.

To create a group domain:

In the Create Domain dialog box which follows:

The Domain Group editor is opened:

Note:

Example:

To slice or classify a map with slope values that range from 0 to 200% into 5 relief classes as Flat (0-2%), Undulating (2-8%), Rolling (8-16%), Hilly (16-30%), Mountainous (>30%) (FAO), the following domain Group can be created:

Upper
Boundary


Group Name

2

Flat

8

Undulating

16

Rolling

30

Hilly

200

Mountainous

To apply the group domain:

To classify values in a map, use the Slicing operation or use the CLFY function in MapCalc. The operation and the function produce the same results.

To classify values in a column, use the CLFY function in TabCalc.

For more information, see How to classify a map or column.

To edit the representation of (a map with) a group domain:

When you create a group domain, also a representation is created with the same name as the domain. You can edit the colors of the output groups, i.e. classes, by choosing Representation from the Edit menu in the domain editor, or by opening the representation from the Catalog.

When you have displayed your output raster map in a map window, you can also choose the Representation command from the Edit menu in the map window:

See also: