Function Description
Merge the objects that meet certain conditions in a line dataset, region dataset, and text dataset into one object. This function is applicable to line dataset, 2D region dataset, 3D line dataset, and text dataset.
The following conditions are required for dataset dissolve:
- The value of a field is the same between data objects.
- Line objects can be blended only when their endpoints coincide.
- Face objects must intersect or be adjacent (have a common edge).
The dataset dissolve function includes three processing methods: fusion, combination, and group after dissolving.
Caution: By default, text dataset fusion only supports the processing method of Group
- The effect of the fusion function is as follow :
Fuse the object numbered 1 As shown above, the show results fusion is to fuse multiple sub-objects into a simple object. The region numbered 1 is fused, but the non-adjacent objects are not fused.
- The effect of the combined function is as follow :
The objects numbered 1 are combined into a compound As shown above, the combination of show results is to combine multiple sub-objects into a compound, in which the intersection part of the object is processed according to the exclusive or operation.
- The effect of the
group after dissolving function is as follows: The objects
numbered 1 are combined into a compound
Function entrance
- Data tab-> Data Processing Group-> Vector -> Dissolve .
- Toolbox->Data Processing->Vector->Dissolve.
Parameter description
- Source Dataset : displays all lines and region datasets under the selected data source. Select the data set to be fused.
- Fusion mode : The system provides three fusion modes.
- Dissolve : Objects with the same property field value and intersection or distance within the fusion tolerance range are merged into a whole object.
- Group : Objects with the same property field value are combined into one object, and the overlapping parts are deleted.
- Group after Dissolving : intersect/tangent objects with the same property field value are merged into a simple object. After merging, if the merged field values of the objects are different, they are combined into a complex object.
- Fusion tolerance : After fusion, if the distance between two or more nodes is within this tolerance range, they are merged into one node. The default value is one millionth of the boundary range of the data set (the maximum tolerance is 100 times the default tolerance), and the unit is the original unit of the data set.
Caution: During
text dataset fusion, only combination is supported as the fusion mode, and the fusion limit cannot be set (meaningless).
- Filter Expression : Only objects that meet this condition can participate in the fusion operation.
- Process objects which have no field values : if this check box is selected, the object with empty merged field value will participate in the merging operation.
- Merged Field : a field in the dataset that has the same field value. Data fusion and combination are carried out according to the value of this field.
- Statistic Field : Perform field statistics on the fused object (generate a new field to store the statistical value). The statistics type can be Max , Min , Sum , Average , First Object、Last Object、Text Link。
- Max : Find the maximum value of the field for the fused/combined object. Only valid for numeric fields and time fields.
- Min : Find the minimum value of the field for the fusion/combination object. It is only valid for numeric fields and time fields.
- Sum : Sums the fields of the fused/combined object. Only valid for numeric fields.
- Average : calculates the average value of the field for the fused/combined object. It is only valid for numeric fields.
- First Object : Get the field value corresponding to the object with the smallest SmID in the fusion/combination object.
- Last Object : Get the field value corresponding to the object with the largest SmID in the fusion/combination object.
- Text Link : Get the string connected by semicolon (;) in the field value of the fusion/combination object. It is only valid for the text field. Application scenario: The expressway data set contains an administrative division field. During fusion, the value of the field needs to be connected with a semicolon to know which administrative division the expressway passes through.
Caution: The merged field must be set when
using this type. The merged field values of the text link objects need to be the same.
- Preserve the table structure of the source dataset : Check to reserve the table structure of source dataset. When this parameter is checked, preserve the table structure of the source dataset will be performed, that is, all other fields that are not selected as merged field and statistic field will be reserved. And the field's values are empty.
- Result Data : Name and save the merged result dataset, and select the data source of the dataset.
Caution: merged field value, the system will not merge.
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