Simplify

This node returns for each input geometry a simplified representation. The applied algorithm recursively splits the original lines into smaller parts and connects the endpoints of each part by a straight line. Then, it removes all points whose distance to the straight line is smaller than the provided tolerance distance. It does not move any points and it always preserves endpoints of the original line or polygon.

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

Options

Geometry column

Select the geometry column to use

Simplification tolerance

The simplification tolerance distances for geometry. All parts of a simplified geometry will be no more than tolerance distance from the original. It has the same units as the coordinate reference system of the GeoSeries. For example, using tolerance=100 in a projected CRS with meters as units means a distance of 100 meters in reality.

Options

Geometry column

Select the geometry column to use.

Tolerance distance

The tolerance distances in the selected distance unit. All parts of a simplified geometry will be no more than tolerance distance from their original position.

Distance unit

Choose the distance unit to use.

Available options:

  • Use unit from input CRS: Do not re-project but use the unit of the input CRS.
  • Meter: Use the default projection with meter as unit. The projection is the UTM CRS for the UTM zone in which the centroid of the input geometries lies. This projection works well for most latitudes but may not work for some extreme northern locations like Svalbard or far northern Norway in which case you might want to use your own projection prior using this node.
  • Kilometer: Use the default projection with kilometer as unit. The projection is the UTM CRS for the UTM zone in which the centroid of the input geometries lies. This projection works well for most latitudes but may not work for some extreme northern locations like Svalbard or far northern Norway in which case you might want to use your own projection prior using this node.
  • Miles: Use the default projection with miles as unit. The projection is the UTM CRS for the UTM zone in which the centroid of the input geometries lies. This projection works well for most latitudes but may not work for some extreme northern locations like Svalbard or far northern Norway in which case you might want to use your own projection prior using this node.
  • Degree: Use the epsg:4326 with degree as unit.
Keep CRS from input table

If checked the CRS of the input table is retained even if a re-projection was necessary for the selected distance unit.

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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Table with geometries to simplify.

Output Ports

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Input table with simplified geometries.

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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:

v4.7

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

Plugin provider: SDL, Harvard, Cambridge US
Plugin version: 1.1.1.202306211527
On NodePit since: 2022-12-12
Last update: 2024-12-16
KNIME versions: v5.1, v4.7

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