v.ellipse - GRASS GIS manual

NAME

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

KEYWORDS

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)