By creating an attribute map of a raster map, the class name or ID of each pixel in the original map is replaced by the value, class or ID found in a certain column in an attribute table.
A raster map using a Class or ID domain, can have extra attribute information on the classes or identifiers in the map. These attributes are stored in columns in an attribute table. The attribute table can be linked to the map to which it refers, or to the domain of the map. You can check whether an attribute table is linked to the raster map or to its domain through the Properties dialog box of the map or the domain.
Dialog box options:
Input raster map: |
Select an input raster map. Open the list box and select the desired input map, or drag a raster map directly from the Catalog into this box. The input map should be a domain Class or ID map. |
Table: |
By default, the attribute table linked to the selected input map or to its domain is shown. In case you want to use another table, select a table with the same domain as the input map from the list box. |
Attribute: |
Select an attribute column from the attribute table. |
Output raster map: |
Type a name for the output raster map that will contain the attribute values. |
Domain: |
In case the output map uses a value domain, accept the default domain (the domain of the selected column), select another value domain or create a new value domain. |
Value range: |
Accept the default value range, or specify your own range of possible values in the output map. |
Precision: |
Accept the default precision of output values, or specify your own precision. |
Description: |
Optionally, type a description for the output map. The description will appear in the status bar of the Main window when moving the mouse pointer over the map in a Catalog, and in the title bar of a map window when the output map is displayed. If no description is supplied, the output map will use its own definition as description. |
When you click the Show button, the dependent output map will be defined, calculated and shown. When you click the Define button, the dependent output map will only be defined; if necessary the map will be calculated later, for instance when the map is opened to be displayed.
See also: