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## man page of v.outlier

### v.outlier: Removes outliers from vector point data.

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NAME

v.outlier- Removes outliers from vector point data.## KEYWORDS

vector, statistics## SYNOPSIS

v.outlier v.outlier help v.outlier[-e]input=name output=name outlier=name[qgis=name] [soe=float] [son=float] [lambda_i=float] [thres_o=float] [--overwrite] [--verbose] [--quiet]Flags: -eEstimate point density and distance Estimate point density and distance for the input vector points within the current region extends and quit--overwriteAllow output files to overwrite existing files--verboseVerbose module output--quietQuiet module outputParameters: input=nameName of input vector mapoutput=nameName for output vector mapoutlier=nameName of output outlier vector mapqgis=nameName of vector map for visualization in QGISsoe=floatInterpolation spline step value in east direction Default:10 son=floatInterpolation spline step value in north direction Default:10 lambda_i=floatTykhonov regularization weight Default:0.1 thres_o=floatThreshold for the outliers Default:50## DESCRIPTION

v.outlierremoves outlier points. By default, the outlier identification is done by a bicubic spline interpolation of the observation with a high regularization parameter and a low resolution in south-north and east-west directions. Those points that differ in an absolute value more than the given threshold from a fixed value, reckoned from its surroundings by the interpolation, are considered as an outlier, and hence are removed. There is a flag to create a vector that can be visualizated by qgis. That means that topology is build and the z coordinate is considered as a category.## EXAMPLES

Basic outlier removalv.outlier input=vector_map output=vector_output outlier=vector_outlier thres_O=25 In this case, a basic outlier removal is done with a threshold of 25 m.Basic outlier removalv.outlier -q input=vector_map output=vector_output outlier=vector_outlier qgis=vector_qgis Now, the outlier removal uses the default threshold and there is also an output vector available for visualizaton in QGIS (//www.qgis.org).## NOTES

This module is designed to work with LIDAR data, so not topology is built but in the QGIS output.SEE ALSO

v.surf.bspline## AUTHORS

Original version of the program in GRASS 5.4: Maria Antonia Brovelli, Massimiliano Cannata, Ulisse Longoni and Mirko Reguzzoni Updates for GRASS 6: Roberto Antolin Last changed: $Date: 2010-09-16 09:25:59 +0200 (Thu, 16 Sep 2010) $ Full index (C) 2003-2010 GRASS Development Team V.OUTLIER(1)

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