ОПИСАНИЕ

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.

ПРИМЕРЫ

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).

ПРИМЕЧАНИЯ

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

СМ. ТАКЖЕ

v.surf.bspline

АВТОРЫ

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: 2006-09-04 18:58:47 -0500 (Пн, 04 сен 2006) $

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