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v.outlier.1grass
Langue: en
Version: 312185 (ubuntu - 07/07/09)
Section: 1 (Commandes utilisateur)
NAME
v.outlierDESCRIPTION
v.outlier removes 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 removal
v.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 removal
v.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 (http://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.bsplineAUTHORS
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: 2007/04/16 21:36:04 $
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