v.outlier - Removes outliers from vector point data
KEYWORDS
vector, statistics
SYNOPSIS
v.outlier v.outlier help v.outlierinput=nameoutput=nameoutlier=name [qgis=name] [soe=float] [son=float] [lambda_i=float] [thres_o=float] [--overwrite]
Flags:
--overwrite
Force overwrite of output files
Parameters:
input=name
Name of input vector map
output=name
Name for output vector map
outlier=name
Name of output outlier vector map
qgis=name
Name of vector map for visualization in qgis
soe=float
Interpolation spline step value in east direction
Default: 10
son=float
Interpolation spline step value in north direction
Default: 10
lambda_i=float
Thychonov regularization weigth
Default: 0.1
thres_o=float
Threshold for the outliers
Default: 50
DESCRIPTION
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.