When performing operations such as intersection, merging, Xor, and connecting lines on Geometry, we need to consider the attribute assignment of the generated new object. Application provides an attribute processing dialog box, which is convenient for users to set the attributes of the object after the operation. Here, the attribute processing dialog box will be described using the merge as an example.

Edit the layer

Editable layers in Layer Manager are listed in the drop-down list to the right of the Edit Layer tab. When there are multiple layers available for editing, you need to select the layer for the merge operation, that is, the layer to which the combined object is finally merged. Objects on other layers remain unchanged.

List box

The rest of the list box displays the names of all Non-System Field: and editable System Field: of the merged objects, their types, and the steps for each field value after merging. To modify the action step for a field, you can select the field in this list box and reselect the action step in the Action column.

Parameter Description

• Null: The value of this field of the Union Result object is null.
• Sum: The value of this field of the Union Result object is the sum of the values of the corresponding fields of each merged object. Numeric fields are added and summed directly. The text of multiple objects is automatically concatenated in SmID order when text fields are summed.
• Weighted Mean: the value of this field of Union Result object (must be a numeric field) is the average value of this field of all consolidated objects. You can calculate either a simple average or a Weighted Mean value. Calculates a simple average by default.

  Select the Average radio button, click the Drop-down Button on the right, and select the No Weighted Field (Average) item, that is, when the weighted field is not used, it means to calculate the simple average, add the selected field values of all source objects, and then divide by the number of source objects.

  If you select one of the fields in the drop-down menu to the right of the Average radio button, the Weighted Mean operation is performed using the field and the selected field in the list box.

• Save Geometry: The value of this field of the operation result object is the same as that of the selected object. When the selected object is switched, the selected Keep Objects will be highlighted on the map, so that the user can clearly identify the location of the selected object in the map.