Multiple Ring Buffer

This Node Is Deprecated — This version of the node has been replaced with a new and improved version. The old version is kept for backwards-compatibility, but for all new workflows we suggest to use the version linked below.
Go to Suggested ReplacementMultiple Ring Buffer

This node generate multiple polygons with a series distances of each geometric object.

Note: If the input table contains multiple rows the node first computes the union of all geometries before computing the buffers from the union.

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

Options

Geometry column

Select the geometry column to use.

Serial buffer distances with coma

The buffer distances for geometry

Serial buffer distances

The buffer distances for geometry

CRS for buffering distance calculation

Enter the Coordinate reference system (CRS) to use. The input field supports the following types:

  • An authority string (i.e. 'epsg:4326')
  • An EPSG code (i.e. 4326)
  • CRS WKT string

Common EPSG codes that can be universally used for mapping coordinates everywhere in the world are:

  • epsg:4326 (WGS 84, Unit: degree): Latitude/longitude coordinate system based on the Earth's center of mass; Used by the Global Positioning System among others. This is also the default projection that the geospatial nodes use if not otherwise specified.
  • epsg:3857 (Unit: meter): Web Mercator projection used by many web-based mapping tools, including Google Maps and OpenStreetMap.

There are EPSG codes for specific regions that provide a higher accuracy in the corresponding regions:

For a selection of projections that preserve different properties see this Wikipedia article. Once you have found the appropriate projection name or coordinate reference system you can search for its EPSG code at https://epsg.io/. To do so simply type the projection name into the search field (e.g. Pseudo-Mercator). The result page will show you the EPSG code that you can enter in this field (e.g. EPSG:3857) but also the distance unit e.g. meter or degree and the area of use where the projection works best.

If you are looking for a projection for a specific area, try out the Projection wizard page which suggests projection with specific properties for a defined area on the globe. Once you have found the appropriate projection simply click on the WKT link next to the suggested projection name, copy it to your clipboard and paste it into this field.

Input Ports

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Table with geometry column to buffer

Output Ports

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Transformed table by Multiple Ring Buffer

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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: 1.2.0.202311151543
On NodePit since: 2023-12-06
Last update: 2024-04-29
Tags: Deprecated
KNIME versions: Since v5.2

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