JensenTrapezoid: Computes the four corner points of a Jensen trapezoid (or cone).
Description
Provided a wind direction, a point and a downwind length, computes the corner points of a Jensen trapezoid (in the literature oftentimes called a 'cone').
Usage
JensenTrapezoid(WindDir, Point, x, Margin = TRUE)
Value
JensenTrapezoid returns a matrix of four columns (the four corner points) and two rows (x and y coordinates).
Arguments
WindDir
unique value, a wind direction in degrees.
Point
a vector of two containing x and y coordinates of a point. Usually, both will be between 0 and 1.
x
downwind distance of the cone in meters.
Margin
specified whether to add a small margin to the distance parameter (i.e. internally, compute x * 1.1). Defaults to TRUE.
Author
Carsten Croonenbroeck
References
Jensen, N. O. (1983). A note on wind generator interaction. Roskilde: Riso National Laboratory. Riso-M, No. 2411
See Also
JensenAngle to compute 'cone' angle information, PointInPolygon for a test whether a point is inside a polygon.