advectionF {CoSMoS}

Advection fields

Description

Provides parametric functions that describe different types of advection fields.

Usage

advectionF(id, ...)

Arguments

id

advection type id (uniform, rotation, spiral, spiralCE, radial, and hyperbolic)

...

other arguments (vector of coordinates and parameters of advection field functions)

References

Papalexiou, S.M., Serinaldi, F., Porcu, E. (2021). Advancing Space-Time Simulation of Random Fields: From Storms to Cyclones and Beyond. Water Resources Research, 57, e2020WR029466, doi: 10.1029/2020WR029466

Examples

library(ggquiver)
library(ggplot2)

## specify coordinates
m = 25
aux <- seq(0, m - 1, length = m)
coord <- expand.grid(aux, aux)

## get the advection field
af <- advectionF('spiral',
                 spacepoints = coord,
                 x0 = floor(m / 2),
                 y0 = floor(m / 2),
                 a = 3,
                 b = 2,
                 rotation = 1)

## visualize advection field
dta <- data.frame(lon = coord[ ,1], lat = coord[ ,2], u = af[ ,1], v = af[ ,2])
ggplot(dta, aes(x = lon, y = lat, u = u, v = v)) +
geom_quiver() +
theme_light()