v.ellipse - GRASS GIS manual

Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.

NAME

v.ellipse - Computes the best-fitting ellipse for given vector data.

KEYWORDS

vector, geometry, best-fitting ellipse

SYNOPSIS

v.ellipse

v.ellipse --help

v.ellipse input=name output=name [step=float] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

--overwrite: Allow output files to overwrite existing files
--help: Print usage summary
--verbose: Verbose module output
--quiet: Quiet module output
--ui: Force launching GUI dialog

Parameters:

input=name [required]: Name of input vector map; Or data source for direct OGR access
output=name [required]: Name for output vector map
step=float: Step size in degrees; Default: 4

DESCRIPTION
EXAMPLE
REFERENCES
SEE ALSO
AUTHOR

DESCRIPTION

v.ellipse computes the best-fitting ellipse for input vector map and creates new output vector map with ellipse. Input vector data might be 2D points, lines, or areas.

Fig: Fitting ellipse created with v.ellipse The parameters of ellipse are printed on output if --verbose flag is given.

Example of v.ellipse created around set of points (using data points_of_interest, North Carolina sample data set). Ellipse is is approximated by linestring with point distance 1 degree (step).

v.ellipse input=points_of_interest output=ellipse step=1

REFERENCES

Charles F. Van Loan: Using the Ellipse to Fit and Enclose Data Points.

AUTHOR

Tereza Fiedlerova, OSGeoREL, Czech Technical University in Prague, Czech Republic

SOURCE CODE

Available at: v.ellipse source code (history)

Latest change: Mon Jun 28 07:54:09 2021 in commit: 1cfc0af029a35a5d6c7dae5ca7204d0eb85dbc55