How to change

the definition of a dependent data object

Dependent raster maps that are the result of a calculation with MapCalc and dependent columns that are the result of a calculation with TabCalc, have an editable definition. The formula or expression with which a dependent raster map (MapCalculate) or a dependent column (ColumnCalculate) is created, is stored in the object definition file of the object, can be viewed in the properties dialog box of the object and can also be changed there.

You can thus simply redo a calculation with a slightly different formula in the same map or the same column without the need of creating another new map or column.

You can only edit the definition of MapCalculate maps and ColumnCalculate columns; expressions of other dependent objects created by other operations (such as MapFilter, MapDistance, MapCross) cannot be edited. For maps created by an operation, the properties dialog box allows you to select another output domain, and in case of a value domain adjust the value range and precision with which values are to be stored for the output map.

To edit the definition a dependent raster map:

or

One or more Raster Map Properties sheet(s) will appear:

Subsequently, the Raster Map Definition dialog box appears in which you can change the expression by which the raster map is created, select a domain and in case of a value domain, specify the value range and precision with which the values in the output map should be stored. When you click the OK button, the raster map is redefined.

To edit the definition of a dependent column:

The table which contains the dependent columns should be displayed in a table window. Then,

or

A Column Properties dialog box will appear in which you can change the expression by which the column is created, select a domain and in case of a value domain, specify the value range and precision with which the values in the output column should be stored. When you click the OK button, the column is redefined and immediately recalculated.

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