r.SDE {aspace} | R Documentation |
Demo Data: Standard Deviation Ellipse Output Object
Description
Results from the Standard Deviation Ellipse Calculator (calc_sde) are stored in a list object. This object is required for the plot function (plot_sde).
Usage
data(r.SDE)
Format
The list object contains the following results:
- id
- Identifier for the SDE estimate - it should be unique
- points
- a simple two-column data frame (or matrix) containing x,y coordinates for a series of point locations.
- calccentre
- Boolean: TRUE if mean centre is computed
- CENTRE.x
- X-coordinate of the centre
- CENTRE.y
- Y-coordinate of the centre
- Sigma.x
- Half-length of axis along x-axis
- Sigma.y
- Half-length of axis along y-axis
- Major
- String indicating which axis is the major elliptical axis
- Minor
- String indicating which axis is the minor elliptical axis
- Theta
- Rotation angle in degrees
- Eccentricity
- A measure of eccentricity (i.e., the flatness of the ellipse)
- Area.sde
- Area of the SDE
- TanTheta
- Trigonometric result
- SinTheta
- Trigonometric result
- CosTheta
- Trigonometric result
- SinThetaCosTheta
- Trigonometric result
- Sin2Theta
- Trigonometric result
- Cos2Theta
- Trigonometric result
- ThetaCorr
- Corrected theta angle for rotation of major axis from north
- weighted
- Boolean: TRUE if the weighted mean centre is to be used instead
- weights
- Weights applied to point observations
- central.x
- X-coordinate of central feature
- central.y
- Y-coordinate of central feature
- median.x
- X-coordinate of median centre
- median.y
- Y-coordinate of median centre
- CMD.x
- X-coordinate of centre of minimum distance
- CMD.y
- Y-coordinate of centre of minimum distance
Details
The coordinates of the points must have the same units and projection as the specified center.
Source
This demonstration data has been manufactured for illustrative purposes only.
Examples
data(r.SDE)
str(r.SDE)
[Package
aspace version 2.2
Index]