Semantics

On the «Semantics» tab, you can select objects by a combination of conditions on the values of the semantic characteristics of objects. For example, if you want to select objects whose absolute height value is greater than 100 m, you need to form an expression like: absolute height > 100.

To select semantics in the table, use the «Append» button. In response, the «Semantics choice» dialog box will open, where the selection is made by name or by code of semantic characteristic. By double-clicking or pressing the «Choice» button, the highlighted line of the semantics list is entered into the «Semantics name» column of the «Semantics» bookmark. In this case, the sign = is entered in the «Condition» column, and the first value of the classifier of values ​​is entered into the column «Value», if classifiers of values ​​are set for the selected characteristic. In the case when there are no value classifiers for the selected characteristic or it is necessary to select not the first classifier value, the «Value» column needs to be edited.

To edit the value of a semantic characteristic, double-click in the «Value» column. If for the selected semantics in the RSC-file the classifier of the values of the semantic characteristic is not set, then the required value is entered directly in the 3rd column of the table. End of editing - pressing the «Enter» key. Otherwise, the value is selected from the list of possible classifier values.

To edit the selection condition, double-click in the «Condition» column of the characteristics table of the «Semantics» bookmark, and then select the required conditions from the list of possible conditions. Symbols in the list of conditions mean:

!=  value of semantic characteristic is not equal to the given one;

*    any value of this characteristic is permissible;

<   value of semantic characteristic is less than the specified one;

<= value of semantic characteristic is not more than the given one;

=   value of semantic characteristic is equal to the given one;

>   value of the semantic characteristic is greater than the specified one;

>= value of the semantic characteristic is not less than the given one;

x   for this characteristic, any value is prohibited.

When you set the criteria for searching for objects by semantic characteristics, you can use the tools of combining individual semantics into groups with a single selection condition - «All are true (AND)» or «At list one is true (OR)».

This allows you to set various variants of objects search's parameters both in semantics group, and between the sets of characteristics prepared by the user.

To compose groups, you must select semantics («Shift» or «Ctrl» + the left mouse button), and then use the pop-up menu on the right button. Menu items provide the creation and destruction of groups of semantics.