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Filter WKT data using ECQL queries

KNIME Spatial Processing Nodes version 1.2.2.v201911131528 by EIFER (European Institute for Energy Research)

Filters WKT (Well-known Text) geometries according to their characteristics or geometries using the Contextual Query Language Only the lines for which the expression is true will be kept.

Examples of queries:

  • Select entities whom area is smaller than 10 units: "area(the_geom) ≤ 10"
  • Select entities whom area between 10000 and 30000: "area(the_geom) BETWEEN 10000 AND 30000"
More examples can be found here: Geoserver CQG Tutorial

Note that the units used in the query depend on the Coordinate System.

The actual processing is done by the powerful geotools library.

Options

query
The query in Contextual Query Language

Input Ports

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Entities with spatial features

Output Ports

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The filtered entities

Best Friends (Incoming)

Best Friends (Outgoing)

Installation

To use this node in KNIME, install KNIME Spatial Processing Nodes from the following update site:

KNIME 4.3

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

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Developers

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