The QGIS Standard Deviational Ellipse Plugin

The QGIS Standard Deviational Ellipse plugin implements the algorithms presented in “The Standard Deviational Ellipse; An Updated Tool for Spatial Description”. Robert S. Yuill. Geografiska Annaler. Series B, Human Geography. Vol. 53, No. 1 (1971), pp. 28-39. URL: https://www.jstor.org/stable/490885

Functionality

  • The QGIS Standard Deviational Ellipse plugin can be used to investigate point patterns, showing a summary of the distribution as a standard deviational ellipse.
  • Output is a polygon layer with the standard deviational ellipse as the only feature. The following attributes are available for the layer / ellipse: meanx, meany, majorangle (in radians, relative to east), minorangle, majorsd, minorsd.

Options

  • The user can specify if only selected features are to be used (but if no features are selected, all features will be used)
  • The user can select an attribute for weighting.

Implementation

The calculations of the standard deviational ellipse is performed in a separate thread.

Versions

The current version is 1.0.

  • 1.0: First official version.

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