Convex Hull
Purpose
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The tool is provided for creating convex hulls around point, polyline
and polygon features.
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Input features |
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Convex hull |
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Description
The Convex Hull tool is meant for building convex hulls for the selected point, polyline and polygon features. If grouping fields are selected, then multiple hulls will be created for defined groups of features.
As a result, a new hull polygon dataset is created.
In those cases when input data contain only one or two points and consequently it is impossible to build a polygon hull for these features (as building a polygon requires at least three points), hulls with empty geometry will be created.
Usage
In order to create a convex hull, run the tool and specify following parameters:
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Input features.
Input features can be points, polylines and polygons. If there are any selected features in the input data, an option to process only selected features will be enabled. Select this option to build convex hull only for the selected features. -
Output feature class.
This parameter defines a new feature class for output hull polygons. Output hulls can be saved in a shapefile format or as a geodatabase feature class. -
Group by fields. This parameter is optional.
By default, if no group by field selected, one convex hull polygon will be created for all input features.
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Geometry |
Attributes |
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In order to create multiple convex hulls, select one or a few fields for grouping input features. In this case a separate convex hull will be created for each group of features. Group by fields will be added to the attribute table of the output feature class.
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Geometry |
Attributes |
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Buffer size. This parameter is optional.
An option to add buffer to the created convex hull polygons is available. To create a new convex hull with buffer you can specify the required buffer size and units. Negative and fractional values are allowed for buffer size. Default “0” value means no buffer will be added to the output hull.
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No buffer |
Buffer 20 meters |
Buffer -20 meters |
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