fSombraEst<-function(angGen, distances, struct)
{
stopifnot(is.list(struct),is.data.frame(distances))
## Preparo datos de partida
distances=distances/struct$L
Alfa=coredata(angGen$Alfa)
Beta=coredata(angGen$Beta)
AlS=coredata(angGen$AlS)
AzS=coredata(angGen$AzS)
cosTheta=coredata(angGen$cosTheta)
h=distances$H #Debe estar previamente normalizada
d=distances$D
## Cálculos
s=cos(Beta)+cos(Alfa-AzS)*(sin(Beta)+h)/tan(AlS)
FC=sin(AlS)/sin(Beta+AlS)
SombraCond=(s-d>0)
FS=(s-d)*SombraCond*FC*(cosTheta>0)
## Resultado
FS=FS*(FS>0)
FS[FS>1]<-1
return(zoo(FS, index(angGen)))
}
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