Create Multi-buffer
Instructions for use
Multi-buffer creates multiple buffers within a specified distance around a Geometry. The generated buffer results can continue to participate in subsequent analysis operations.
- Currently, Application does not support -buffer for CAD Dataset and Network DatasetCreate Multi.
- For line data Create Multi-Buffer, you can select either Round or Flat Buffer Type; for point/surface data, the system can only generate Round by default.
Function entrance
- Select the Multi-buffer item from the Spatial Analysis tab-> Vector Analysis-> Buffer-> drop-down menu;
- Toolbox-> Vector Analysis Tool-> Buffer-> Multi-buffer Item; (iDesktopX)
Parameter Description
- Buffer
Datasource: Select the Datasource where the Dataset to Create Multi-buffer is located.
Dataset: The system supports the Create Multi-buffer for point, line and surface data, so the "Dataset" drop-down list displays all the point, line and Region datasets in the selected Datasource. Here, select a Dataset that requires a Create Multi-buffer.
- Buffer Type
If the Parameter Settings in the Create Buffer Zone, Buffer Type area of the snapline object is available, you can set the type of the snapline object Create Multi-buffer.
- When
- Round: Create Multi-Buffer, parallel lines are drawn on both sides of the line according to the buffer distance, and a semicircle is drawn at the end of the line with the buffer distance as the radius to connect the Create Buffer Zone. The default Buffer Type is Round. When
- Flat: Create Multi-Buffer, the line segment between adjacent nodes of the line object is used as a rectangular side, and the left radius or right radius is used as the other side of the rectangle to generate a buffer area with a rectangular shape. When the line data is generated as Flat, a multi-buffer in a single direction can be generated.
- Left Radius: Create Multi-buffer based on the left area of Buffer Radius: Online Data.
- Right Radius: Create Multi-buffer based on the right area of Buffer Radius: Online Data.
- Buffer Radio List
You can use the Batch Add, Insert, and Delete buttons in the toolbar to set Buffer Radius:. Buffer Radius from top to bottom in the buffer radius list: corresponding to Multi-Buffer. Buffer Radius list, click the value in the Radius column to modify Buffer Radius:.
- Batch Add: Click in the toolbar Batch Add button pops up the Batch Add "dialog box, where you can set the value of Buffer Radius with certain increment/decrement rules. Buffer Radius at all levels takes the buffer object as the benchmark Create Buffer Zone. By default, the system creates a buffer of 10-30 meters with an interval of 10 meters. The added Buffer Radius: values are displayed in turn in the Buffer Radio List.
- Start Value: Sets the radius value of the innermost buffer.
- End value: Sets the radius value of the outermost buffer.
- Step: Set the interval distance between buffers at all levels, i.e. Buffer Radius: Difference.
- Number of segments: Sets the number of levels for the Create Multi-buffer.
- Update End Value: If this check box is checked, the system will automatically calculate the radius value of the outermost buffer in the generated Multi-Buffer based on the input start value, step length, and number of segments. If the check box is not checked, the radius value of the outermost buffer is generated by default according to the end value entered.
- Insert: Select one or more buffer radii and click the Insert button to add a buffer radius value before the selected buffer radius. The default inserted value is 10.
- Unit: Available Buffer Radius: Units include: millimeter, centimeter, decimeter, meter, kilometer, inch, foot, mile, degree, yard, etc.
- Batch Add: Click in the toolbar Batch Add button pops up the Batch Add "dialog box, where you can set the value of Buffer Radius with certain increment/decrement rules. Buffer Radius at all levels takes the buffer object as the benchmark Create Buffer Zone. By default, the system creates a buffer of 10-30 meters with an interval of 10 meters. The added Buffer Radius: values are displayed in turn in the Buffer Radio List.
- Parameter Settings: Set whether to merge the generated Multi-buffer, whether to Keep Attributes, and the numerical value of the semicircular arc line segment.
- Union Buffer: Check this item to indicate that the same buffer of Buffer Radius: will be merged. Uncheck this item to keep the generated buffer results and not perform the merge operation. As shown in the following figure, two more buffers are generated for two sectors (blue). In order to show the buffer effect more intuitively (Figure 1), the generated results are in the Buffer Radius: Create Thematic Map. Move the generated results and find that the buffers of the same Buffer Radius: are merged into a complex object. Figure 2 shows one of the merged buffers. Note: When Union Buffer is not checked, buffers of the same Buffer Radius: are not merged into two separate simple objects.
Figure 1: Multi-buffer result Figure 2: A set of merged buffers - Generate Ring-Buffer: Check this item to indicate that the outer ring buffer is adjacent to the inner ring data in a ring area when Create Multi-Buffer. The outer buffer, when unchecked, is an area that contains the inner data. This is checked by default.
- Keep Attributes: Check this item to indicate that each generated buffer will keep the corresponding non-system attribute Select Fields of the original object. Unchecking this will lose the Non-system Field: Attributes of the original object. This is checked by default. Note: This is not available when "Union Buffer" is checked.
- Number of semicircular arc segments (4-200): Used to set the smoothness of the generated buffer boundary. The higher the number, the more the number of arc/arc segment equalizations, and the smoother the buffer boundary. The value range is 4-200. The default value is 100.
- Union Buffer: Check this item to indicate that the same buffer of Buffer Radius: will be merged. Uncheck this item to keep the generated buffer results and not perform the merge operation. As shown in the following figure, two more buffers are generated for two sectors (blue). In order to show the buffer effect more intuitively (Figure 1), the generated results are in the Buffer Radius: Create Thematic Map. Move the generated results and find that the buffers of the same Buffer Radius: are merged into a complex object. Figure 2 shows one of the merged buffers. Note: When Union Buffer is not checked, buffers of the same Buffer Radius: are not merged into two separate simple objects.
- Result Data:
- Datasource: Select the Datasource to save the generated Multi-buffer results.
- Dataset: Enter the Dataset Name to save the generated Multi-buffer results. If the entered Dataset Name already exists, you will be prompted with Invalid dataset name and need to re-enter it.
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