Convex Hull

This node generate the smallest convex Polygon containing all the points in each geometry. The convex hull of a geometry is the smallest convex Polygon containing all the points in each geometry, unless the number of points in the geometric object is less than three. For two points, the convex hull collapses to a LineString; for 1, a Point.

The node is based on the GeoPandas project and uses the following related information and function:

Options

Geometry column

Select the geometry column to compute the convex hull.

Output

Group of settings that define the format of the result table.

Output column

Choose where to place the result column:

Available options:

  • Replace: Replace the selected input column with the result.
  • Append: Append a new column with the name provided below.
New column name

The name of the new column that is appended if 'Append' is selected.

Input Ports

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Input table with a geospatial column to compute the 'hull' for.

Output Ports

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Geo input table with additional 'hull' column containing the hull of each input geometry in the units of the CRS.

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Links

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Installation

To use this node in KNIME, install the extension Geospatial Analytics Extension for KNIME from the below update site following our NodePit Product and Node Installation Guide:

v5.2

A zipped version of the software site can be downloaded here.

Plugin provider: SDL, Harvard, Cambridge US
Plugin version: 1.3.0.202412051033
On NodePit since: 2023-12-06
Last update: 2024-12-25
KNIME versions: From v5.2 to v5.2

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