phi2phi {viadam} | R Documentation |
Convert from a deflecting angle in a sloping coordinate system aligned with the terrain to deflecting angle in a horizontal projection.
phi2phi(phi,phih,psi)
phi |
deflecting angle with respect to the direction of steepest decent in a sloping coordinate system aligned with the terrain. |
phih |
deflecting angle with respect to the direction of steepest decent in the map plane, that is the angle between the horizontal projections of the avalanche direction and the dam axis. |
psi |
the slope of the terrain. |
phi2phi
returns a vector of angles
with the same number of elements as phi
, phih
or psi
.
The arguments must be named so that the routine can
differentiate between phi
and phih
.
The angles phi
, phih
and psi
are given in radians.
In general, phi
<= phih
so that the deflecting angle in
the map plane may be used as a conservative estimate of the
deflecting angle for dam design.
Tomas Johannesson
vdamheight
, sdamslope
, damangle
and phicontour
.
## Not run: phi2phi(phi=25*pi/180,psi=10*pi/180) ## End(Not run)